CN105406330A - 1550nm Q-switched pulse erbium-ytterbium co-doped fiber laser device - Google Patents
1550nm Q-switched pulse erbium-ytterbium co-doped fiber laser device Download PDFInfo
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- CN105406330A CN105406330A CN201510810980.6A CN201510810980A CN105406330A CN 105406330 A CN105406330 A CN 105406330A CN 201510810980 A CN201510810980 A CN 201510810980A CN 105406330 A CN105406330 A CN 105406330A
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Abstract
The invention is applicable to the technical field of fiber laser devices, and provides a 1550nm Q-switched pulse erbium-ytterbium co-doped fiber laser device. The 1550nm Q-switched pulse erbium-ytterbium co-doped fiber laser device comprises a circuit module and an optical path module, wherein the optical path module comprises a seed source module, at least one first fiber amplifier, at least one second fiber amplifier, a photoelectric protection device and a collimating output optical isolator, which are sequentially connected with one another via a same optical axis; the seed source module comprises a first pumping laser device, a high-reflectivity fiber grating, a low-reflectivity fiber grating, a first beam combiner, a first gain fiber and a modulator; and an output laser of the 1550nm Q-switched pulse erbium-ytterbium co-doped fiber laser device comprises a random polarization mode or a linear polarization mode. Therefore, the targets that the 1550nm fiber laser device can carry out random polarized output and can also carry out linear polarized output are achieved; and high average power, narrow pulse width and high peak power output can be achieved.
Description
Technical field
The present invention relates to fiber laser technology field, particularly relate to a kind of 1550nm Q impulse erbium-ytterbium co-doped fiber laser.
Background technology
1550nm wave band is positioned at the 3rd low-loss communication window, this wave band of laser has very strong penetration power to cloud and mist, flue dust, and human eye exceeds four orders of magnitude at the damage threshold of 1550nm wave band than at the damage threshold of 1060nm wave band, so this laser wavelength is also referred to as " eye-safe " laser wavelength.The fields such as optical fiber communication, laser radar, laser ranging, 3D scanning, biomedicine are widely used in by means of its this wave band of laser of above feature.And 1550nm fiber laser because its Threshold pumped power is low, conversion efficiency is high, compact conformation, good heat dissipation communicate with existing fiber and the feature such as optical fiber sensing system is completely compatible, becomes the study hotspot in present laser field.
Current commonly er-doped 1550nm pulse optical fiber, easily there is Cluster Phenomenon in erbium ion wherein, maximum quantum conversion efficiency is low, be difficult to realize high-power output, and be easy to when erbium ion-doped concentration is higher produce concentration quenching thus occur that Energy upconversion causes the problems such as self-pulsing.The power of er-doped 1550nm pulse optical fiber is difficult to improve, but the 1550nm laser of not all power level can meet practical application, so the power level how improving 1550nm pulse optical fiber is a large limiting factor of its further genralrlization application at present.
In addition, current erbium-ytterbium co-doped fiber laser mostly is random polarization and exports, and cannot meet the requirement of application as laser radar, non-linear wavelength convert etc. of some needs linearly polarized lasers.
In summary, obviously there is inconvenience and defect in actual use, so be necessary to be improved in existing laser.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of 1550nm Q impulse erbium-ytterbium co-doped fiber laser, object be to realize a kind of can the pulse optical fiber of random polarization exports or linear polarization exports high stability, and can high-average power, narrow spaces, high-peak power.
To achieve these goals, the invention provides a kind of 1550nm Q impulse erbium-ytterbium co-doped fiber laser, comprise circuit module and light path module, described light path module comprises seed resource module, at least one first optical fiber amplifying device, at least one the second optical fiber amplifying device, photoelectric protector and collimation output optical isolator that same optical axis connects successively;
Described seed resource module comprises the first pump laser, high reflectance fiber grating, antiradar reflectivity fiber grating, the first bundling device, the first gain fibre and modulator; Described first optical fiber amplifying device comprises the first online optical isolator, the first fiber amplifier, the second gain fibre, the first optical fiber filter, the second pump laser, the second bundling device; Described second optical fiber amplifying device comprises the second online optical isolator, the second fiber amplifier, the 3rd pump laser, the 3rd bundling device, the second optical fiber filter and the 3rd gain fibre; The Output of laser of described 1550nm Q impulse erbium-ytterbium co-doped fiber laser has random polarization pattern or linear polarization pattern.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described circuit module comprises:
Pumping drive circuit, for driving described first pump laser, described second pump laser, described 3rd pump laser generation continuous laser;
Modulator driver circuit, for driving described modulator and by the quality factor changing resonant cavity, continuous laser being become pulse laser, described modulator driver circuit changes the repetition rate exporting pulse laser by the signal of telecommunication; Described modulator is acousto-optic modulator or electrooptic modulator;
Control circuit, for regulating powering on and power-off sequential of described seed resource module, described first optical fiber amplifying device and described second optical fiber amplifying device, described control circuit passes through the setup parameter of man-machine interface to control power and the repetition rate of Output of laser;
Protective circuit, for monitoring and the protection on the temperature and light road of described 1550nm Q impulse erbium-ytterbium co-doped fiber laser.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described seed resource module comprises forward pumping structure or counter-pumping configuration;
The described seed resource module of forward pumping vibrational power flow comprises the described high reflectance fiber grating connected successively, described first pump laser, described first bundling device, described first gain fibre, described modulator and antiradar reflectivity fiber grating, the signal input part of described first bundling device is connected to described high reflectance fiber grating, the signal output part of described first bundling device is connected to the first gain fibre, and the pumping end of described first bundling device is connected to described first pump laser; Or
The described seed resource module that counter-pumping configuration is arranged comprises the described high reflectance fiber grating connected successively, described modulator, described first gain fibre, described first pump laser, described first bundling device and described antiradar reflectivity fiber grating, described first bundling device signal input part is connected to described antiradar reflectivity fiber grating, the signal output part of described first bundling device is connected to described first gain fibre, and the pumping end of described first bundling device is connected to described first pump laser.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described seed resource module comprises pumping configuration outside intracavity pump structure or chamber;
The described seed resource module of intracavity pump structure comprises the described high reflectance fiber grating connected successively, described first pump laser, described first bundling device, described first gain fibre, described modulator and described antiradar reflectivity fiber grating, described first bundling device signal input part is connected to described high reflectance fiber grating, the signal output part of described first bundling device is connected to described first gain fibre, and the pumping end of described first bundling device is connected to the first pump laser; Or
Outside chamber, the described seed resource module of pumping configuration comprises described first pump laser connected successively, described first bundling device, described high reflectance fiber grating, described first gain fibre, described modulator and described antiradar reflectivity fiber grating, described first bundling device signal input part is not connected with other devices, the signal output part of described first bundling device is connected to described high reflectance fiber grating, and the pumping end of described first bundling device is connected to described first pump laser.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described first fiber amplifier comprises forward pumping structure or counter-pumping configuration;
Described second pump laser, described second bundling device and described second gain fibre that described first fiber amplifier of forward pumping structure connects successively, the signal input part of described second bundling device is connected with the described first online optical isolator output, the signal output part of described second bundling device is connected with described second gain fibre, and the pumping end of described second bundling device is connected to described second pump laser; Or
Described second gain fibre, described second pump laser and described second bundling device that described first fiber amplifier of counter-pumping configuration connects successively, the signal input part of described second bundling device is connected with the input of the described first optical fiber filter input of described first optical fiber amplifying device of rear stage or described second optical fiber filter of described second optical fiber amplifying device, the signal output part of described second bundling device is connected with described second gain fibre, and the pumping end of described second bundling device is connected to described second pump laser.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described second fiber amplifier comprises forward pumping structure or counter-pumping configuration;
Described second fiber amplifier of forward pumping structure connects described 3rd pump laser, described 3rd bundling device and described 3rd gain fibre successively, the signal input part of described 3rd bundling device is connected with the described second online optical isolator output, the signal output part of described 3rd bundling device is connected with described 3rd gain fibre, and described 3rd bundling device pumping end is connected to described 3rd pump laser;
Described second fiber amplifier of counter-pumping configuration connects described 3rd gain fibre, described 3rd pump laser and described 3rd bundling device successively, the input that the input of the signal input part of described 3rd bundling device and described second optical fiber filter of described second optical fiber amplifying device of rear stage or described collimation export optical isolator is connected, the signal output part of described 3rd bundling device is connected with described 3rd gain fibre, and the pumping end of described 3rd bundling device is connected to described 3rd pump laser.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention; described photoelectric protector is arranged on described 3rd gain fibre and describedly collimates the fusion point place exporting optical isolator, and described photoelectric protector comprises coupler, band optical fiber electric explorer that splitting ratio is 99.9%:0.1% and is not with optical fiber electric explorer.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, the reflectivity of described high reflectance fiber grating is 99.9%, the centre wavelength 1550.12nm of described high reflectance fiber grating, described antiradar reflectivity fiber grating reflectivity is 15%-20%, the centre wavelength 1550.12nm of described antiradar reflectivity fiber grating, the centre wavelength 915nm of described first pump laser.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described linear polarization pattern comprises first kind of way, described first kind of way comprises: described high reflectance fiber grating and described antiradar reflectivity fiber grating are single polarization associated fiber grating, described first gain fibre, described second gain fibre and described 3rd gain fibre are also all polarization maintaining optical fibre and are erbium ytterbium co doped double clad fiber, and the signal optical fibre of the optical passive component arranged in described light path module is polarization maintaining optical fibre.
According to 1550nm Q impulse erbium-ytterbium co-doped fiber laser of the present invention, described linear polarization pattern comprises first kind of way, the described second way comprises: described seed resource module and described first optical fiber amplifying device directly add the optical fiber polarizer, and optical passive component and the erbium-ytterbium co-doped fiber of described first optical fiber amplifying device, described second optical fiber amplifying device and described collimation output optical isolator are all polarization maintaining optical fibre.
The present invention, by adopting the setting of erbium ytterbium co doped double clad fiber and the structural design of light path module, realizes the Q impulse fiber laser of random polarization or linear polarization, and can high-average power, narrow spaces, high-peak power, has using value.
Accompanying drawing explanation
Fig. 1 is the structural representation of 1550nm pulse optical fiber first embodiment of the present invention;
Fig. 2 is pumping configuration schematic diagram outside 1550nm pulse optical fiber seed resource module chamber of the present invention;
Fig. 3 is 1550nm pulse optical fiber seed resource module counter-pumping configuration schematic diagram of the present invention;
Fig. 4 is 1550nm pulse optical fiber first optical fiber amplifying device counter-pumping configuration schematic diagram of the present invention;
Fig. 5 is 1550nm pulse optical fiber second optical fiber amplifying device counter-pumping configuration schematic diagram of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In conjunction with Fig. 1 ~ Fig. 5 explanation in diagram, see Fig. 1, the invention provides a kind of 1550nm Q impulse erbium-ytterbium co-doped fiber laser, comprise circuit module 2 and light path module 1, described light path module 1 comprises seed resource module 3, at least one first optical fiber amplifying device 4, at least one second optical fiber amplifying device 5, photoelectric protector 6 and the collimation output optical isolator 7 that same optical axis connects successively;
Described seed resource module 3 comprises the first pump laser 13, high reflectance fiber grating 12, antiradar reflectivity fiber grating 17, first bundling device 14, first gain fibre 15 and modulator 16; Described first optical fiber amplifying device 4 comprises the first online optical isolator 18, first fiber amplifier 19, second gain fibre 22, first optical fiber filter 28, second pump laser 20, second bundling device 21; Described second optical fiber amplifying device 5 comprises the second online optical isolator 23, second fiber amplifier 24, the 3rd pump laser 25, the 3rd bundling device 26, second optical fiber filter 29 and the 3rd gain fibre 27; The Output of laser of described 1550nm Q impulse erbium-ytterbium co-doped fiber laser also comprises random polarization pattern or linear polarization pattern.Described modulator 16 is acousto-optic modulator or electrooptic modulator.
Described 1550nm Q impulse erbium-ytterbium co-doped fiber laser, preferred, described circuit module comprises:
Pumping drive circuit 9, produces continuous laser for driving described first pump laser 13, described second pump laser 20, described 3rd pump laser 25;
Modulator driver circuit 8, for driving described modulator 16 and by the quality factor changing resonant cavity, continuous laser being become pulse laser, described modulator driver circuit 8 changes the repetition rate exporting pulse laser by the signal of telecommunication; Acousto-optic modulator or electrooptic modulator is adopted to mate according to modulator 16.
Control circuit 10, for regulating powering on and power-off sequential of described seed resource module, described first optical fiber amplifying device 4 and described second optical fiber amplifying device 5, described control circuit 10 passes through the setup parameter of man-machine interface to control power and the repetition rate of Output of laser;
Protective circuit 11, for monitoring and the protection on the temperature and light road of described 1550nm Q impulse erbium-ytterbium co-doped fiber laser.
Further, described linear polarization pattern comprises first kind of way, described first kind of way comprises: described high reflectance fiber grating and described antiradar reflectivity fiber grating are single polarization associated fiber grating, described first gain fibre, described second gain fibre 22 and described 3rd gain fibre 27 are also all polarization maintaining optical fibre and are erbium ytterbium co doped double clad fiber, and the signal optical fibre of remaining optical passive component in described light path module is polarization maintaining optical fibre.The optical passive component of described setting is distinguished with the optical passive component not arranging polarization maintaining optical fibre, herein, the optical passive component of described setting refers to the optical passive component in described light path module 1 except described high reflectance fiber grating 12 and described antiradar reflectivity fiber grating 17, described first gain fibre 15, described second gain fibre 22 and described 3rd gain fibre 27.
Relative to first kind of way, can alternative be, described linear polarization pattern comprises the second way, the described second way comprises: directly add the optical fiber polarizer at described seed resource module 3 and described first optical fiber amplifying device 4 place, described first optical fiber amplifying device 4, described second optical fiber amplifying device 5 and described collimation export optical isolator 7 and are provided with optical passive component and erbium-ytterbium co-doped fiber, and described optical passive component and described erbium-ytterbium co-doped fiber are all polarization maintaining optical fibre.Adopt erbium-ytterbium co-doped fiber, good buffer action can be played to contiguous erbium Er3+ ion by the ytterbium Yb3+ ion doping of high concentration, thus reduce the concentration quenching effect of Er3+ significantly, reduce the probability that upper conversion occurs between Er3+ simultaneously, effectively improve gain and power output.And due to the absorption spectra very wide (800nm-1000nm) of Yb3+, amplification system can be improved requirement to pump laser wavelength is also reduced to the absorption efficiency of pump light simultaneously.
Further, described 1550nm Q impulse erbium-ytterbium co-doped fiber laser, described seed resource module 3 comprises forward pumping structure or counter-pumping configuration;
As shown in Figure 1, the described seed resource module 3 of forward pumping vibrational power flow comprises the high reflectance fiber grating 12 connected successively, first pump laser 13, first bundling device 14, first gain fibre 15, modulator 16 and antiradar reflectivity fiber grating 17, the signal input part of described first bundling device 14 is connected to described high reflectance fiber grating 12, the signal output part of described first bundling device 14 is connected to the first gain fibre 15, the pumping end of described first bundling device 14 is connected to described first pump laser 13, M bar pumping end is connected to N number of first pump laser (13) (M >=N >=1), or
The described seed resource module 3 that counter-pumping configuration is arranged comprises the described high reflectance fiber grating 12 connected successively, described modulator 16, described first gain fibre 15, described first pump laser 13, described first bundling device 14 and described antiradar reflectivity fiber grating 17, described first bundling device 14 signal input part is connected to described antiradar reflectivity fiber grating 17, the signal output part of described first bundling device 14 is connected to described first gain fibre 15, the pumping end of described first bundling device 14 is connected to described first pump laser 13, M bar pumping end is connected to N number of first pump laser 13 (M >=N >=1).
In addition, described 1550nm Q impulse erbium-ytterbium co-doped fiber laser, described seed resource module 3 comprises pumping configuration outside intracavity pump structure or chamber;
As shown in Figure 1, the described seed resource module 3 of intracavity pump structure comprises the described high reflectance fiber grating 12 connected successively, described first pump laser 13, described first bundling device 14, described first gain fibre 15, described modulator 16 and described antiradar reflectivity fiber grating 17, described first bundling device 14 signal input part is connected to described high reflectance fiber grating 12, the signal output part of described first bundling device 14 is connected to described first gain fibre 15, the pumping end of described first bundling device 14 is connected to the first pump laser 13, M1 bar pumping end is connected to N1 the first pump laser 13 (M1 >=N1 >=1), or
As shown in Figure 2, outside chamber, the described seed resource module 3 of pumping configuration comprises described first pump laser 13 connected successively, described first bundling device 14, described high reflectance fiber grating 12, described first gain fibre 15, described modulator 16 and described antiradar reflectivity fiber grating 17, described first bundling device 14 signal input part is not connected with other devices, the signal output part of described first bundling device 14 is connected to described high reflectance fiber grating 12, the pumping end of described first bundling device 14 is connected to described first pump laser 13, M1 bar pumping end is connected to N1 the first pump laser 13 (M1 >=N1 >=1).
Further, described 1550nm Q impulse erbium-ytterbium co-doped fiber laser, described first fiber amplifier 4 comprises forward pumping structure or counter-pumping configuration;
As shown in Figure 1, described second pump laser 20, described second bundling device 21 and described second gain fibre 22 that described first fiber amplifier 4 of forward pumping structure connects successively, the signal input part of described second bundling device 21 is connected with the described first online optical isolator 18 output, the signal output part of described second bundling device 21 is connected with described second gain fibre 22, the pumping end of described second bundling device 21 is connected to described second pump laser 20, M2 bar pumping end and is connected to N2 the second pump laser 20 (M2 >=N2 >=1); Or
As shown in Figure 4, described second gain fibre 22 that described first fiber amplifier 19 of counter-pumping configuration connects successively, described second pump laser 20 and described second bundling device 21, the signal input part of described second bundling device 21 is connected with the input of described first optical fiber filter 28 input of described first optical fiber amplifying device 4 of rear stage or described second optical fiber filter 29 of described second optical fiber amplifying device 5, the signal output part of described second bundling device 21 is connected with described second gain fibre 22, the pumping end of described second bundling device 21 is connected to described second pump laser 20, M2 bar pumping end is connected to N2 the second pump laser 20 (M2 >=N2 >=1), the advantage of the first fiber amplifier 19 of forward pumping structure is that the signal to noise ratio of amplifier out is higher than counter-pumping configuration, and the advantage of the first fiber amplifier 19 of counter-pumping configuration is that the gain ability of amplifier is higher than forward pumping structure.
Described 1550nm Q impulse erbium-ytterbium co-doped fiber laser further, described second fiber amplifier 24 comprises forward pumping structure or counter-pumping configuration;
As shown in Figure 1, described second fiber amplifier 24 of forward pumping structure connects described 3rd pump laser 25, described 3rd bundling device 26 and described 3rd gain fibre 27 successively, the signal input part of described 3rd bundling device 26 is connected with the described second online optical isolator 23 output, the signal output part of described 3rd bundling device 26 is connected with described 3rd gain fibre 27, described 3rd bundling device 26 pumping end is connected to described 3rd pump laser 25, M3 articles of pumping ends and is connected to N3 the 3rd pump laser 25 (M3 >=N3 >=1); Or
As shown in Figure 5, described second fiber amplifier 24 of counter-pumping configuration connects described 3rd gain fibre 27 successively, described 3rd pump laser 25 and described 3rd bundling device 26, the input that the input of the signal input part of the 3rd bundling device 26 and described second optical fiber filter 29 of described second optical fiber amplifying device 5 of rear stage or described collimation export optical isolator 7 is connected, the signal output part of described 3rd bundling device 26 is connected with the 3rd gain fibre 27, the pumping end of described 3rd bundling device 26 is connected to described 3rd pump laser 25, M3 article pumping end is connected to N3 the 3rd pump laser 25 (M3 >=N3 >=1), the advantage of the first fiber amplifier 19 of forward pumping structure is that the signal to noise ratio of amplifier out is higher than backward pumping, and the advantage of the first fiber amplifier 19 of counter-pumping configuration is that the gain ability of amplifier is higher than forward pumping.
Further; described photoelectric protector 6 is arranged on described 3rd gain fibre 27 and collimate with described the fusion point place exporting optical isolator 7, and described photoelectric protector 6 comprises coupler 30 that splitting ratio is 99.9%:0.1%, is with optical fiber electric explorer 31 and is not with optical fiber electric explorer 32.Wherein coupler 30 and band optical fiber electric explorer 31 are for detecting light echo power, can power-off immediately avoid light echo oppositely to amplify damage optical fiber through the 3rd gain fibre 27 if light echo crosses forceful electric power road; Not being with optical fiber electric explorer 32 whether impaired for detecting light path, can power-off immediately preventing lasting light leak from bringing Continuous Damage to light path once optical fiber blows.The two collaborative work plays a protective role to laser light path part.
Described 1550nm Q impulse erbium-ytterbium co-doped fiber laser specific embodiment, as shown in Figure 1, repetition rate 25KHz, high reflectance fiber grating 12 reflectivity is 99.9%, centre wavelength 1550.12nm, antiradar reflectivity fiber grating 17 reflectivity is 15%-20%, centre wavelength 1550.12nm, first pump laser centre wavelength 915nm, first gain fibre 15 is erbium ytterbium co doped double clad fiber, modulator 16 adopts acousto-optic modulator, the quality factor of the resonant cavity of continuous change seed resource module 3, continuous laser is become pulse laser, seed resource module 3 power output is 689mW, pulsewidth 90ns, repetition rate 25000Hz.Flashlight enters the i.e. prime amplifier of the first fiber amplifier 19 after the online isolator 18 of the first light, cardiac wave 915nm in second pump laser, second gain fibre 22 is identical with the first gain fibre 15 parameter, after the first fiber amplifier 19, flashlight is enlarged into 2.9W, pulse duration is about 95ns, and repetition rate is 25000Hz.Flashlight enters the second fiber amplifier 5 i.e. main power amplifier after the second online isolator 23,3rd pump laser 25 centre wavelength 915nm, 3rd gain fibre 27 is erbium ytterbium co doped double clad fiber, it is 25.7W that flashlight after amplifying exports isolator 7 output valve from collimation, about pulsewidth 105ns, repetition rate 25000Hz, obtaining peak power is as calculated 9.8KW.
In another specific embodiment, as shown in Figure 1, repetition rate is set to 20KHz, polarization high reflectance fiber grating 12 reflectivity of being correlated with is 99.9%, antiradar reflectivity fiber grating 17 reflectivity that single polarization is relevant is 15%-20%, first pump laser 13 centre wavelength 915nm, first gain fibre 15 is erbium ytterbium co doped double clad fiber, modulator 16 is adopted to be acousto-optic modulator, the quality factor of the resonant cavity of continuous change seed resource module 3, continuous laser is become pulse laser, seed resource module 3 power output is 663mW, pulsewidth 95ns, repetition rate 20000Hz, extinction ratio 25dB.Flashlight enters the i.e. prime amplifier of the first fiber amplifier 19 after the online isolator 18 of the first light, second pump laser 20 centre wavelength 915nm, second gain fibre 22 is for protecting inclined erbium-ytterbium co-doped fiber, after the first fiber amplifier 19, flashlight is enlarged into 2.2W, pulse duration is about 100ns, repetition rate is 20000Hz, extinction ratio 22dB.Flashlight enters the second fiber amplifier 5 i.e. main power amplifier after the second online isolator 23, wavelength 915nm centered by 3rd pump laser 25,3rd gain fibre 27 is erbium ytterbium co doped double clad fiber, it is 19.8W that flashlight after amplifying exports isolator 7 output valve from collimation, about pulsewidth 105ns, repetition rate 20000Hz, obtaining peak power is as calculated 9.42KW, extinction ratio 20dB.
Thus, the ambient operating temperature adaptability of 1550nm pulse optical fiber is very strong, normally can work under the ambient temperature of-35 DEG C to 65 DEG C, normal work is all waited under ensureing the circumstance of temperature difference of 100 DEG C, general erbium ytterbium co doped double clad fiber amplifier adopts 975nm semiconductor laser as pump laser usually, because the 3+ valency ion of ytterbium Yb is very high at the absorption coefficient of 975nm, but 975nm absorption band is very narrow, the factors such as temperature be easy to cause pump laser wavelength to drift about thus extreme influence to the stability of amplifier, do not adopt the pump laser of conventional 975nm just because of the present invention but adopt 915nm multimode semiconductor laser as pump light source, although the 3+ valency ion of ytterbium Yb at the absorption coefficient of 915nm lower than the absorption coefficient of 975nm, but the absorption band at 915nm place is very wide ensure that the wave length shift of pumping source can not have a significant effect to amplifier.
In sum, the present invention is directed to the problem that common er-doped 1550nm pulse optical fiber power is lower, adopt erbium ytterbium co doped double clad fiber and high power multimode pump laser to carry out pre-amplification and main power amplification to 1550nm flashlight, effectively improve the power output of laser.The present invention produces narrow spaces pulse light by adjusting Q seed resource module, large and the main power amplification by prevention multistage below, achieve more than average power 20W, about pulse duration 100ns, the high-average power of more than peak power 10KW, narrow spaces, high-peak power Laser output.Various application scenario can well be met.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (10)
1. a 1550nm Q impulse erbium-ytterbium co-doped fiber laser, comprise circuit module and light path module, it is characterized in that, described light path module comprises seed resource module, at least one first optical fiber amplifying device, at least one the second optical fiber amplifying device, photoelectric protector and collimation output optical isolator that same optical axis connects successively;
Described seed resource module comprises the first pump laser, high reflectance fiber grating, antiradar reflectivity fiber grating, the first bundling device, the first gain fibre and modulator; Described first optical fiber amplifying device comprises the first online optical isolator, the first fiber amplifier, the second gain fibre, the first optical fiber filter, the second pump laser, the second bundling device; Described second optical fiber amplifying device comprises the second online optical isolator, the second fiber amplifier, the 3rd pump laser, the 3rd bundling device, the second optical fiber filter and the 3rd gain fibre; The Output of laser of described 1550nm Q impulse erbium-ytterbium co-doped fiber laser has random polarization pattern or linear polarization pattern.
2. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1, it is characterized in that, described circuit module comprises:
Pumping drive circuit, for driving described first pump laser, described second pump laser, described 3rd pump laser generation continuous laser;
Modulator driver circuit, for driving described modulator and by the quality factor changing resonant cavity, continuous laser being become pulse laser, described modulator driver circuit changes the repetition rate exporting pulse laser by the signal of telecommunication; Described modulator is acousto-optic modulator or electrooptic modulator;
Control circuit, for regulating powering on and power-off sequential of described seed resource module, described first optical fiber amplifying device and described second optical fiber amplifying device, described control circuit passes through the setup parameter of man-machine interface to control power and the repetition rate of Output of laser;
Protective circuit, for monitoring and the protection on the temperature and light road of described 1550nm Q impulse erbium-ytterbium co-doped fiber laser.
3. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1, it is characterized in that, described seed resource module comprises forward pumping structure or counter-pumping configuration;
The described seed resource module of forward pumping vibrational power flow comprises the described high reflectance fiber grating connected successively, described first pump laser, described first bundling device, described first gain fibre, described modulator and described antiradar reflectivity fiber grating, the signal input part of described first bundling device is connected to described high reflectance fiber grating, the signal output part of described first bundling device is connected to described first gain fibre, and the pumping end of described first bundling device is connected to described first pump laser; Or
The described seed resource module that counter-pumping configuration is arranged comprises the described high reflectance fiber grating connected successively, described modulator, described first gain fibre, described first pump laser, described first bundling device and described antiradar reflectivity fiber grating, described first bundling device signal input part is connected to described antiradar reflectivity fiber grating, the signal output part of described first bundling device is connected to described first gain fibre, and the pumping end of described first bundling device is connected to described first pump laser.
4. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1, it is characterized in that, described seed resource module comprises pumping configuration outside intracavity pump structure or chamber;
The described seed resource module of intracavity pump structure comprises the described high reflectance fiber grating connected successively, described first pump laser, described first bundling device, described first gain fibre, described modulator and described antiradar reflectivity fiber grating, described first bundling device signal input part is connected to described high reflectance fiber grating, the signal output part of described first bundling device is connected to described first gain fibre, and the pumping end of described first bundling device is connected to described first pump laser; Or
Outside chamber, the described seed resource module of pumping configuration comprises described first pump laser connected successively, described first bundling device, described high reflectance fiber grating, described first gain fibre, described modulator and described antiradar reflectivity fiber grating, described first bundling device signal input part is not connected with other devices, the signal output part of described first bundling device is connected to described high reflectance fiber grating, and the pumping end of described first bundling device is connected to described first pump laser.
5. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1, it is characterized in that, described first fiber amplifier comprises forward pumping structure or counter-pumping configuration;
Described second pump laser, described second bundling device and described second gain fibre that described first fiber amplifier of forward pumping structure connects successively, the signal input part of described second bundling device is connected with the described first online optical isolator output, the signal output part of described second bundling device is connected with described second gain fibre, and the pumping end of described second bundling device is connected to described second pump laser; Or
Described second gain fibre, described second pump laser and described second bundling device that described first fiber amplifier of counter-pumping configuration connects successively, the signal input part of described second bundling device is connected with the input of the described first optical fiber filter input of described first optical fiber amplifying device of rear stage or described second optical fiber filter of described second optical fiber amplifying device, the signal output part of described second bundling device is connected with described second gain fibre, and the pumping end of described second bundling device is connected to described second pump laser.
6. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1, it is characterized in that, described second fiber amplifier comprises forward pumping structure or counter-pumping configuration;
Described second fiber amplifier of forward pumping structure connects described 3rd pump laser, described 3rd bundling device and described 3rd gain fibre successively, the signal input part of described 3rd bundling device is connected with the described second online optical isolator output, the signal output part of described 3rd bundling device is connected with described 3rd gain fibre, and described 3rd bundling device pumping end is connected to described 3rd pump laser;
Described second fiber amplifier of counter-pumping configuration connects described 3rd gain fibre, described 3rd pump laser and described 3rd bundling device successively, the input that the input of the signal input part of described 3rd bundling device and described second optical fiber filter of described second optical fiber amplifying device of rear stage or described collimation export optical isolator is connected, the signal output part of described 3rd bundling device is connected with described 3rd gain fibre, and the pumping end of described 3rd bundling device is connected to described 3rd pump laser.
7. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1; it is characterized in that; described photoelectric protector is arranged on described 3rd gain fibre and describedly collimates the fusion point place exporting optical isolator, and described photoelectric protector comprises coupler, band optical fiber electric explorer that splitting ratio is 99.9%:0.1% and is not with optical fiber electric explorer.
8. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to claim 1, it is characterized in that, the reflectivity of described high reflectance fiber grating is 99.9%, the centre wavelength 1550.12nm of described high reflectance fiber grating, described antiradar reflectivity fiber grating reflectivity is 15%-20%, the centre wavelength 1550.12nm of described antiradar reflectivity fiber grating, the centre wavelength 915nm of described first pump laser.
9. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to any one of claim 1 ~ 8, it is characterized in that, described linear polarization pattern comprises first kind of way, described first kind of way comprises: described high reflectance fiber grating and described antiradar reflectivity fiber grating are single polarization associated fiber grating, described first gain fibre, described second gain fibre and described 3rd gain fibre are also all polarization maintaining optical fibre and are erbium ytterbium co doped double clad fiber, and the signal optical fibre of the optical passive component arranged in described light path module is polarization maintaining optical fibre.
10. 1550nm Q impulse erbium-ytterbium co-doped fiber laser according to any one of claim 1 ~ 8, it is characterized in that, described linear polarization pattern comprises the second way, the described second way comprises: described seed resource module and described first optical fiber amplifying device directly add the optical fiber polarizer, described first optical fiber amplifying device, described second optical fiber amplifying device and described collimation export optical isolator and are provided with optical passive component and erbium-ytterbium co-doped fiber, and described optical passive component and described erbium-ytterbium co-doped fiber are all polarization maintaining optical fibre.
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