CN105428988A - Femtosecond optical parameter oscillator of femtosecond green light synchronous pump - Google Patents
Femtosecond optical parameter oscillator of femtosecond green light synchronous pump Download PDFInfo
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- CN105428988A CN105428988A CN201610003424.2A CN201610003424A CN105428988A CN 105428988 A CN105428988 A CN 105428988A CN 201610003424 A CN201610003424 A CN 201610003424A CN 105428988 A CN105428988 A CN 105428988A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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Abstract
The invention provides a femtosecond optical parameter oscillator of a femtosecond green light synchronous pump. The femtosecond optical parameter oscillator comprises the components of an all-solid femtosecond mode-locked Yb laser, a first half wave plate, a first focusing lens, a frequency doubling crystal, a first dichroic mirror, a second focusing lens, a second half wave plate, a second dichroic mirror, a polarization beam splitter, a third half wave plate, a third dichroic mirror, a fourth dichroic mirror, a third focusing lens, a first concave mirror, a parameter crystal, a second concave mirror, a first plane mirror, an output mirror and a second plane mirror. The invention further provides application of the femtosecond optical parameter oscillator. The femtosecond optical parameter oscillator of the femtosecond green light synchronous pump has advantages of simple structure, stable performance, high output power, low price, etc. Furthermore the femtosecond optical parameter oscillator of the femtosecond green light synchronous pump has high economic benefit and is suitable for popularization.
Description
Technical field
The invention belongs to technical field of ultrafast laser, relate to a kind of Femtosecond OPO, be specifically related to a kind of Femtosecond OPO of femtosecond green glow synchronous pump.
Background technology
Ultrafast laser technique, since invention, has caused the great interest of people and attention.Due to the transient process of its distinctive psec (ps) or femtosecond (fs) magnitude, and the spectral component of wide covering and there is very high peak power, make relevant ultrafast laser at many important scientific research fields and industrial circle as time-resolved spectroscopy, spectrum measurement, attosecond science, optical microphotograph imaging, bio-photon, micro nano structure processing and fabricating, and the field such as Strong-field physics has important application.And the femtosecond laser of visible ray-near infrared band has the advantage such as larger photon energy and shorter wavelength due to it, measure in as technology such as coherent anti-stokes raman scattering (CARS) micro-imagings significant at high-spatial and temporal resolution.The ti sapphire laser based on kerr lens mode locking mechanism occurred for 1991, through the development of two more than ten years, has become the most ripe and the ultrafast laser light source be most widely used at present.Its emission wavelength ranges covers 700-1000nm, and can produce the ultrashort pulse that pulse duration does not wait from sub-10fs to several ps, be comparatively common visible ray-near-infrared ultra-short pulse generation device.But the spectral tunable range of the Ti∶Sapphire oscillator of femtosecond only can cover 750-950nm, shorter visible ray or longer near infrared band pulse cannot be produced, and power output generally only has hundreds of milliwatt magnitude.And adopt the means of nonlinear frequency transformation, as optical parametric oscillator (OPO), be the another kind of comparatively effective method producing covering 600-1000nm wideband adjustable femtosecond light source.
Along with Femtosecond Ti∶sapphire laser flourish of kerr lens mode locking, the OPO based on femto second titanium sapphire oscillators synchronous pump becomes the focus studied for a long time.Mainly there are two kinds of technology paths in the femto-second laser pulse utilizing femto second titanium sapphire oscillators synchronous pump OPO to produce visible light wave range.The first directly utilizes femto second titanium sapphire oscillators pumping OPO first to produce near infrared flashlight, then in OPO chamber, carries out frequency multiplication to flashlight, spectrum is extended to visible light wave range.In this way, the femtosecond visible ray that T.J.Driscoll obtains 580-660nm exports profit, and its wavelength cover only has 80nm.Another method first carries out frequency multiplication to femto second titanium sapphire oscillators, obtains the blue light ultrashort pulse that wavelength is about 400nm, then with blue light desynchronize pumping OPO produce visible ray export.Based on this technology path, M.Ebrahim-Zadeh seminar utilizes the titanium precious stone laser pumping BiB of frequency multiplication
3o
6(BIBO) crystal, the covering achieving 480-710nm is green-visible ray of Huang-orange-red color, and further by intracavity frequency doubling, obtain the Ultra-Violet Laser of 250-355nm.Therefore, compared with the first technology path, the means utilizing the titanium precious stone laser pumping OPO of frequency multiplication to add intracavity frequency doubling can obtain the ultrashort pulse of the whole visible light wave range of nearly cover, have better application prospect.But no matter be utilize which kind of technological means, Femtosecond Ti∶sapphire laser all can face following two kinds of limitation as the pumping source of OPO.
First, Ti∶Sapphire oscillator is expensive, needs expensive frequency multiplication Nd:YVO
4laser carrys out pumping, and complex structure, safeguards operating difficulties; Secondly, power output based on the femto second titanium sapphire oscillators of KLM locked mode is generally not more than 2W, after frequency multiplication, power is maximum especially only has about 1W, and femto second titanium sapphire oscillators repetition rate is generally 100MHz, corresponding single pulse energy only has nJ magnitude, therefore pump intensity is very low, and non-linear gain is very little, limits the efficiency of its nonlinear transformation.Based on above two factors, the power output utilizing femto second titanium sapphire oscillators pumping OPO to produce ultrafast broadband tunable laser only has hundred milliwatt magnitudes usually, significantly limit it requires in high pulse energy or high-average power field application at some.
Doping with rare-earth ions ytterbium (Yb
3+) the centre wavelength of femtosecond locked mode all solid state laser near 1 μm, the closely centre wavelength 800nm of Ti∶Sapphire oscillator, but relative low price.Therefore set up a kind of frequency multiplication femtosecond Yb laser that utilizes will to have great importance and be worth as the synchronous pump Femtosecond OPO of pumping source.
Summary of the invention
Therefore, the object of the invention is to overcome deficiency of the prior art, provide a kind of cheap, power output is high, compact conformation and can the Femtosecond OPO of femtosecond green glow synchronous pump of the continuously adjustable femtosecond visible ray-near-infrared laser of output wavelength, and the application of this Femtosecond OPO.
For achieving the above object, the invention provides a kind of Femtosecond OPO of femtosecond green glow synchronous pump, it comprises: all solid state femtosecond locked mode Yb laser, the first half-wave plate, the first condenser lens, frequency-doubling crystal, the first dichroic mirror, the second condenser lens, the second half-wave plate, the second dichroic mirror, polarization splitting prism, the 3rd half-wave plate, the 3rd dichroic mirror, the 4th dichroic mirror, the 3rd condenser lens, the first concave mirror, parametric crystals, the second concave mirror, the first plane mirror, outgoing mirror, the second plane mirror.
Described all solid state femtosecond locked mode Yb laser, for the femtosecond mode-locked laser pulse of output wavelength near 1 μm using as the femtosecond laser treating frequency multiplication.
Described first half-wave plate, for adjusting the polarization state of femtosecond laser.
Described first condenser lens, focuses on frequency-doubling crystal for the femtosecond laser that receives through the first half-wave plate.
Described frequency-doubling crystal, for by femtosecond laser frequency multiplication to produce the nonlinear crystal of femtosecond green glow.
Described first dichroic mirror, it is high anti-and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light to femtosecond green glow 45 degree.
Described second condenser lens, for receiving reflection from the femtosecond green glow of the first dichroic mirror and to its collimation.
Described second half-wave plate, for adjusting the polarization state of the femtosecond green glow through the second condenser lens.
Described second dichroic mirror, it is high anti-and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light to femtosecond green glow 45 degree.
Described polarization splitting prism, reflects the polarization state from the femtosecond green glow of the second dichroic mirror for selecting, and with the second half-wave plate together for regulating pump power.Or the power of femtosecond green glow and polarization state together can be controlled by the second half-wave plate, polarization splitting prism and the 3rd half-wave plate.
Described 3rd half-wave plate, for adjusting the polarization state of the femtosecond green glow from polarization splitting prism.Described second half-wave plate and the 3rd half-wave plate, by changing the polarization state of femtosecond green glow, can realize the phase matched of pump light (femtosecond green glow), parameter signals light and ideler frequency light.
Described 3rd dichroic mirror and the 4th dichroic mirror, it is all high anti-to femtosecond green glow 45 degree and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light.
Described 3rd condenser lens, for focusing on parametric crystals by reflection from the femtosecond green glow of the 4th dichroic mirror.
Described parametric crystals, for generation of the nonlinear crystal of parameter signals light, it is placed between the first concave mirror and the second concave mirror.
Described first concave mirror and the second concave mirror, for the formation of confocal resonance cavity configuration.This confocal resonance cavity configuration makes the beam waist of the flashlight beam waist on parametric crystals and pump light (femtosecond green glow) match, and realizes high parameter transform efficiency.
Described first plane mirror, makes its normal incidence to outgoing mirror for the parameter signals light that reflects from the second concave mirror.
Described outgoing mirror, for forming an end mirror in parametric reasonance chamber and exporting a part of flashlight.
Described second plane mirror, for returning parameter signals light from the first concave mirror to form another end mirror in parametric reasonance chamber by the reflection of former road.
Doping with rare-earth ions ytterbium (the Yb that the present invention adopts
3+) the centre wavelength of femtosecond locked mode all solid state laser near 1 μm, the closely centre wavelength 800nm of Ti∶Sapphire oscillator, the femtosecond green glow produced after utilizing its frequency multiplication pumping OPO again, can produce the ultra-short pulse laser of visible ray near infrared band.Further by SHG and SFG technology in OPO chamber, output wavelength can expand to ultraviolet light wave band.Adopt technique scheme of the present invention, greatly can save cost on the one hand, femtosecond Yb laser can export higher average power on the other hand, thus can obtain more high-power tunable visible ray-near-infrared laser.
According to Femtosecond OPO of the present invention, wherein, described all solid state femtosecond locked mode Yb laser is the femtosecond oscillator of the Yb doping gain media of LD pumping, centre wavelength is near 1 μm, export average power and be greater than 3W, pulse duration is 100fs, and repetition rate is 80MHz.Preferably, described all solid state femtosecond locked mode Yb laser is the kerr lens mode locking femtosecond oscillator of the Yb doping gain media of LD pumping, and described centre wavelength is 1030nm, and described output average power is 7W.More preferably, described Yb doping gain media is Yb:KGW crystal.
According to Femtosecond OPO of the present invention, wherein, described frequency-doubling crystal produces the femtosecond green glow output that average power is greater than 1.5W, pulse duration is 120fs.Preferably, the wavelength of described femtosecond green glow is 515nm.
According to Femtosecond OPO of the present invention, wherein, described frequency-doubling crystal is bismuth borate crystal (BIBO), BBO Crystal (BBO) or lithium triborate crystal (LBO).Preferably, the logical light length of described frequency-doubling crystal is 2.5mm.
According to Femtosecond OPO of the present invention, wherein, described parametric crystals is bismuth borate crystal (BIBO), BBO Crystal (BBO) or lithium triborate crystal (LBO).Preferably, the logical optical cross-section of described parametric crystals is 3mm × 3mm, and logical light length is 3mm, and crystal-cut angle is phi=90 degree, theta=174 degree, and two logical light faces of described parametric crystals are coated with the anti-reflection film to 515nm/600-1100nm respectively.More preferably, described parametric crystals is placed on for finely tuning azimuth and position, XYZ direction on five dimension translation stages, thus realizes high efficiency parametric oscillation and wavelength tuning.
According to Femtosecond OPO of the present invention, wherein, the two sides of described first condenser lens is all coated with the anti-reflection deielectric-coating of femtosecond laser, and be preferably coated with 1 mum wavelength anti-reflection film, focal length is preferably 75mm.The two sides of described second condenser lens and the 3rd condenser lens is all coated with the anti-reflection deielectric-coating of femtosecond green glow, and be preferably coated with 515nm wavelength anti-reflection film, focal length is preferably 150mm.
According to Femtosecond OPO of the present invention, wherein, described first concave mirror is coated with the high saturating deielectric-coating of femtosecond green glow towards the one side of the 3rd condenser lens, and another side is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high anti-deielectric-coating of parameter signals light.Described second concave mirror is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high anti-deielectric-coating of parameter signals light towards the one side of parametric crystals, and another side is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high saturating deielectric-coating of ideler frequency light.Preferably, described is anti-reflection film to 515nm to the high saturating deielectric-coating of femtosecond green glow, and described is high-reflecting film to 600-1100nm to the high anti-deielectric-coating of parameter signals light.More preferably, described first concave mirror and the second concave mirror form tight focusing confocal resonance cavity configuration, and its radius of curvature is R=100mm.
According to Femtosecond OPO of the present invention, wherein, described first plane mirror and the second plane mirror are all being coated with the high anti-deielectric-coating of parameter signals light towards the one side of described confocal resonance cavity configuration, all non-plated film of another side.Preferably, described first plane mirror and the second plane mirror are all greater than 99.9% at the reflectivity at 600-1100nm place.
According to Femtosecond OPO of the present invention, wherein, described outgoing mirror is coated with the deielectric-coating in parameter signals optical band with output coupling efficiency towards the one side of the first plane mirror, and another side is coated with the anti-reflection deielectric-coating of parameter signals optical band.Preferably, described outgoing mirror is placed on an one-dimensional precise translation stage, and the chamber that accurately can change parametric reasonance chamber is long, realizes the cavity length matching with Yb resonant cavity.
Present invention also offers the application of above-mentioned Femtosecond OPO in laser radar, bio-imaging, Ultrafast spectrum or ultrafast optical communication.
The present invention proposes a kind of Femtosecond OPO of novel femtosecond green glow synchronous pump.Utilize the advantage that all solid state locked mode femtosecond Yb laser output power is large, compact conformation, cost are low, the relevant femtosecond visible ray-near-infrared laser of wavelength at 650-1030nm continuously adjustable can be realized easily.Compared to traditional Femtosecond OPO based on the pumping of locked mode ti sapphire laser, the advantages such as the Femtosecond OPO of femtosecond green glow synchronous pump provided by the invention has that structure is simple, stable performance, power output are high, cheap, there is good economic benefit, be applicable to promoting the use of.
Accompanying drawing explanation
Below, describe embodiment of the present invention in detail by reference to the accompanying drawings, wherein:
Fig. 1 shows structure and the light path schematic diagram of the Femtosecond OPO of femtosecond green glow synchronous pump of the present invention;
Fig. 2 shows the tuning figure of parameter signals optical wavelength that Femtosecond OPO of the present invention exports;
Fig. 3 shows the parameter signals luminous power of Femtosecond OPO of the present invention output and the graph of a relation of wavelength;
Fig. 4 shows the parameter signals light impulse length figure (being recorded by intensity autocorrelation function analyzer) that Femtosecond OPO of the present invention exports.
Description of reference numerals:
1, all solid state femtosecond locked mode Yb laser; 2, the first half-wave plate; 3, the first condenser lens; 4, frequency-doubling crystal; 5, the first dichroic mirror; 6, the second condenser lens; 7, the second half-wave plate; 8, the second dichroic mirror; 9, polarization splitting prism; 10, the 3rd half-wave plate; 11, the 3rd dichroic mirror; 12, the 4th dichroic mirror; 13, the 3rd condenser lens; 14, the first concave mirror; 15, parametric crystals; 16, the second concave mirror; 17, the first plane mirror; 18, outgoing mirror; 19, the second plane mirror.
Embodiment
Further illustrate the present invention below by specific embodiment, but should be understood to, these embodiments are only used for the use specifically described more in detail, and should not be construed as limiting the present invention in any form.
Below, in conjunction with the drawings and the specific embodiments the structure of the Femtosecond OPO of femtosecond green glow synchronous pump of the present invention and working effect are further described.
As shown in Figure 1, the Femtosecond OPO of femtosecond green glow synchronous pump provided by the invention comprises: all solid state femtosecond locked mode Yb laser 1, first half-wave plate 2, first condenser lens 3, frequency-doubling crystal 4, first dichroic mirror 5, second condenser lens 6, second half-wave plate 7, second dichroic mirror 8, polarization splitting prism 9, the 3rd half-wave plate 10, the 3rd dichroic mirror 11, the 4th dichroic mirror 12, the 3rd condenser lens 13, first concave mirror 14, parametric crystals 15, second concave mirror 16, first plane mirror 17, outgoing mirror 18, second plane mirror 19.Wherein particularly:
All solid state femtosecond locked mode Yb laser 1 is the kerr lens mode locking femtosecond oscillator of the Yb doping gain media of LD pumping, centre wavelength is 1030nm, and output average power is 7W, and pulse duration is 100fs, repetition rate is 80MHz, Yb doping gain media is Yb:KGW crystal.
First half-wave plate 2, for adjusting the polarization state of 1 μm of femtosecond laser.
First condenser lens 3, focuses on frequency-doubling crystal for 1 μm of femtosecond laser receiving through the first half-wave plate.The two sides of this first condenser lens 3 is all coated with 1 mum wavelength anti-reflection film, and focal length is 75mm.
Frequency-doubling crystal 4, adopts logical light length to be the LBO of 2.5mm, and the femtosecond green glow producing the 515nm wavelength that average power is greater than 1.5W, pulse duration is 120fs exports.
First dichroic mirror 5, it is high anti-and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light to femtosecond green glow 45 degree.
Second condenser lens 6, for receiving reflection from the 515nm femtosecond green glow of the first dichroic mirror and to its collimation.The two sides of this second condenser lens 6 is all coated with 515nm wavelength anti-reflection film, and focal length is 150mm.
Second half-wave plate 7, for adjusting the polarization state of the 515nm femtosecond green glow through the second condenser lens.
Second dichroic mirror 8, it is high anti-and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light to femtosecond green glow 45 degree.
Polarization splitting prism 9, reflects the polarization state from the 515nm femtosecond green glow of the second dichroic mirror for selecting, and with the second half-wave plate together for regulating pump power.
3rd half-wave plate 10, for adjusting the polarization state of the 515nm femtosecond green glow from polarization splitting prism.
3rd dichroic mirror 11 and the 4th dichroic mirror 12, it is all high anti-to 515nm femtosecond green glow 45 degree and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light.
3rd condenser lens 13, for focusing on parametric crystals by reflection from the 515nm femtosecond green glow of the 4th dichroic mirror.The two sides of the 3rd condenser lens 13 is all coated with 515nm wavelength anti-reflection film, and focal length is 150mm.
Parametric crystals 15, for generation of the nonlinear crystal of parameter signals light, it is placed between the first concave mirror and the second concave mirror.This parametric crystals adopts the BIBO crystal of 1mm, and it is 3mm × 3mm that crystal leads to optical cross-section, and logical light length is 3mm, and crystal-cut angle is phi=90 degree, theta=174 degree.This crystal two leads to light face and is coated with anti-reflection film to 515nm (R<1%)/600-1100nm (R<1%) respectively.This crystal is placed on one five dimension translation stage, can finely tune azimuth and position, XYZ direction, realize high efficiency parametric oscillation and wavelength tuning.
First concave mirror 14 and the second concave mirror 16, focuses on confocal resonance cavity configuration for the formation of tight, the beam waist of the parameter signals beam waist size on parametric crystals and pump light (femtosecond green glow) is matched, realizes high parameter transform efficiency.First concave surface minute surface 14 is coated with the high saturating deielectric-coating of femtosecond green glow to the one side of the 3rd condenser lens 13, and another side is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high anti-deielectric-coating of parameter signals light.Second concave mirror 16 is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high anti-deielectric-coating of parameter signals light towards the one side of parametric crystals, and another side is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high saturating deielectric-coating of ideler frequency light.Above-mentioned is anti-reflection film (R<3%) to 515nm to the high saturating deielectric-coating of femtosecond green glow, and above-mentioned is high-reflecting film (R>99.8%) to 600-1100nm to the high anti-deielectric-coating of parameter signals light.The radius of curvature of two concave mirrors is R=100mm.
First plane mirror 17, makes its normal incidence to outgoing mirror for the parameter signals light that reflects from the second concave mirror.It, being coated with towards the one side of described confocal resonance cavity configuration the high anti-deielectric-coating of parameter signals light, is greater than 99.9% at the reflectivity at 600-1100nm place.
Outgoing mirror 18, for forming an end mirror in parametric reasonance chamber and exporting a part of flashlight.Its one side towards the first plane mirror 17 is coated with has in parameter signals optical band the deielectric-coating exporting coupling efficiency, and another side is coated with the anti-reflection deielectric-coating of parameter signals optical band, and the output rating at 600-1100nm place is 11%.This outgoing mirror 18 is placed on an one-dimensional precise translation stage, and the chamber that accurately can change parametric reasonance chamber is long, realizes the cavity length matching with Yb resonant cavity.
Second plane mirror 19, for returning parameter signals light from the first concave mirror to form another end mirror in parametric reasonance chamber by the reflection of former road.It, being coated with towards the one side of described confocal resonance cavity configuration the high anti-deielectric-coating of parameter signals light, is greater than 99.9% at the reflectivity at 600-1100nm place.
The course of work of the Femtosecond OPO of femtosecond green glow synchronous pump of the present invention is described further combined with accompanying drawing.
According to the structure in Fig. 1 and light path, all solid state femtosecond locked mode Yb laser 1, the femtosecond laser of the femto-second pulse duration produced, after adjusting polarization by the first half-wave plate 2, focusing on through the first condenser lens 3 enters in frequency-doubling crystal 4 (lbo crystal), produces the 515nm femtosecond green glow after frequency multiplication.This femtosecond green glow through the first dichroic mirror 5 reflect and through second condenser lens 6 collimate after, reflect via the second half-wave plate 7, second dichroic mirror 8 successively, polarization splitting prism 9, the 3rd half-wave plate 10, the 3rd dichroic mirror 11 reflect, the 4th dichroic mirror 12 reflects, then focus in parametric crystals (BIBO crystal) via the 3rd condenser lens 13.Period, this femtosecond green glow separates with fundamental frequency light by means of the first dichroic mirror 5, second dichroic mirror 8, the 3rd dichroic mirror 11 and the 4th dichroic mirror 12, and its power and polarization state are controlled by the second half-wave plate 7, polarization splitting prism 9 and the 3rd half-wave plate 10.First concave mirror 14 and the second concave mirror 16 form confocal tight focusing lumen type, and the beam waist of the flashlight beam waist on BIBO crystal and pump light (i.e. femtosecond green glow) is matched.First plane mirror 17, for reflecting parameter signals light, makes its normal incidence on outgoing mirror 18; The second former road of plane mirror 19 returns parameter signals light; Outgoing mirror 18 outputs signal light and can to realize the chamber in parametric reasonance chamber long tuning.
Meet phase matched, cavity length matching, stable cavity condition and reach flashlight oscillation threshold condition under, this optical parametric oscillator can realize steady operation, parameter signals light is propagated at parametric reasonance intracavity round trip, and coupling output part flashlight energy during each arrival outgoing mirror.Meanwhile, produce wavelength at the ideler frequency light of 1030-2379nm, can, via the second concave mirror 7 through output, filter then can be utilized to separate residual pump light and ideler frequency light.
According to the physical principle of the femtosecond OPO of synchronous pump, can the wavelength of tuning parameter signals light and ideler frequency light by the following method: the wavelength 1, changing pump light (i.e. femtosecond green glow); 2, the angle of parametric crystals is changed; 3, the chamber changing OPO resonant cavity is long.By above step, relevant femtosecond visible ray-near-infrared laser that parameter signals light operates at 650-1030nm continuously adjustable can be realized.
According to above-described embodiment, by regulating the chamber of OPO resonant cavity long, obtain the tuning range of parameter signals light 650-1050nm, spectral tuning curve as shown in Figure 2.Power output does not coexist between 1-0.5W with parameter signals optical wavelength, as shown in Figure 3.The exemplary pulse widths of the parameter signals light obtained is 149fs, and as shown in Figure 4, wavelength is at 834nm.
Although present invention has been description to a certain degree, significantly, under the condition not departing from the spirit and scope of the present invention, the suitable change of each condition can be carried out, such as, adopt all solid state femtosecond mode-locked laser of other Yb doping gain media as the BIBO crystal of pumping source, employing different length, different cutting angle, parametric crystals BBO or LBO of employing other types etc., adopt the concave mirror of different curvature radius, adopt the outgoing mirror etc. of different output rating.Therefore be appreciated that and the invention is not restricted to described embodiment, and any change is not when departing from the spirit and scope of technical solution of the present invention, it all should covered in the middle of right of the present invention.
Claims (10)
1. the Femtosecond OPO of a femtosecond green glow synchronous pump, it is characterized in that, described Femtosecond OPO comprises: all solid state femtosecond locked mode Yb laser, the first half-wave plate, the first condenser lens, frequency-doubling crystal, the first dichroic mirror, the second condenser lens, the second half-wave plate, the second dichroic mirror, polarization splitting prism, the 3rd half-wave plate, the 3rd dichroic mirror, the 4th dichroic mirror, the 3rd condenser lens, the first concave mirror, parametric crystals, the second concave mirror, the first plane mirror, outgoing mirror, the second plane mirror;
Described all solid state femtosecond locked mode Yb laser, for the femtosecond mode-locked laser pulse of output wavelength near 1 μm using as the femtosecond laser treating frequency multiplication;
Described first half-wave plate, for adjusting the polarization state of femtosecond laser;
Described first condenser lens, focuses on frequency-doubling crystal for the femtosecond laser that receives through the first half-wave plate;
Described frequency-doubling crystal, for by femtosecond laser frequency multiplication to produce the nonlinear crystal of femtosecond green glow;
Described first dichroic mirror, it is high anti-and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light to femtosecond green glow 45 degree;
Described second condenser lens, for receiving reflection from the femtosecond green glow of the first dichroic mirror and to its collimation;
Described second half-wave plate, for adjusting the polarization state of the femtosecond green glow through the second condenser lens;
Described second dichroic mirror, it is high anti-and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light to femtosecond green glow 45 degree;
Described polarization splitting prism, reflects the polarization state from the femtosecond green glow of the second dichroic mirror for selecting, and with the second half-wave plate together for regulating pump power;
Described 3rd half-wave plate, for adjusting the polarization state of the femtosecond green glow from polarization splitting prism;
Described 3rd dichroic mirror and the 4th dichroic mirror, it is all high anti-to femtosecond green glow 45 degree and high thoroughly for by frequency doubled light and fundamental frequency light separately to 1 μm of fundamental frequency light;
Described 3rd condenser lens, for focusing on parametric crystals by reflection from the femtosecond green glow of the 4th dichroic mirror;
Described parametric crystals, for generation of the nonlinear crystal of parameter signals light, it is placed between the first concave mirror and the second concave mirror;
Described first concave mirror and the second concave mirror, for the formation of confocal resonance cavity configuration;
Described first plane mirror, makes its normal incidence to outgoing mirror for the parameter signals light that reflects from the second concave mirror;
Described outgoing mirror, for forming an end mirror in parametric reasonance chamber and exporting a part of flashlight;
Described second plane mirror, for returning parameter signals light from the first concave mirror to form another end mirror in parametric reasonance chamber by the reflection of former road.
2. Femtosecond OPO according to claim 1, it is characterized in that, described all solid state femtosecond locked mode Yb laser is the femtosecond oscillator of the Yb doping gain media of LD pumping, centre wavelength is near 1 μm, export average power and be greater than 3W, pulse duration is 100fs, and repetition rate is 80MHz; Preferably, described all solid state femtosecond locked mode Yb laser is the kerr lens mode locking femtosecond oscillator of the Yb doping gain media of LD pumping, and described centre wavelength is 1030nm, and described output average power is 7W; More preferably, described Yb doping gain media is Yb:KGW crystal.
3. Femtosecond OPO according to claim 1 and 2, is characterized in that, described frequency-doubling crystal produces the femtosecond green glow that average power is greater than 1.5W, pulse duration is 120fs and exports; Preferably, the wavelength of described femtosecond green glow is 515nm.
4. Femtosecond OPO according to any one of claim 1 to 3, is characterized in that, described frequency-doubling crystal is bismuth borate crystal, BBO Crystal or lithium triborate crystal; Preferably, the logical light length of described frequency-doubling crystal is 2.5mm.
5. Femtosecond OPO according to any one of claim 1 to 4, is characterized in that, described parametric crystals is bismuth borate crystal, BBO Crystal or lithium triborate crystal; Preferably, the logical optical cross-section of described parametric crystals is 3mm × 3mm, and logical light length is 3mm, and crystal-cut angle is phi=90 degree, theta=174 degree, and two logical light faces of described parametric crystals are coated with the anti-reflection film to 515nm/600-1100nm respectively; More preferably, described parametric crystals is placed on five dimension translation stages for finely tuning azimuth and position, XYZ direction.
6. Femtosecond OPO according to any one of claim 1 to 5, is characterized in that, the two sides of described first condenser lens is all coated with the anti-reflection deielectric-coating of femtosecond laser, and be preferably coated with 1 mum wavelength anti-reflection film, focal length is preferably 75mm; The two sides of described second condenser lens and the 3rd condenser lens is all coated with the anti-reflection deielectric-coating of femtosecond green glow, and be preferably coated with 515nm wavelength anti-reflection film, focal length is preferably 150mm.
7. Femtosecond OPO according to any one of claim 1 to 6, it is characterized in that, described first concave mirror is coated with the high saturating deielectric-coating of femtosecond green glow towards the one side of the 3rd condenser lens, and another side is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high anti-deielectric-coating of parameter signals light; Described second concave mirror is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high anti-deielectric-coating of parameter signals light towards the one side of parametric crystals, and another side is coated with to the high saturating deielectric-coating of femtosecond green glow with to the high saturating deielectric-coating of ideler frequency light; Preferably, described is anti-reflection film to 515nm to the high saturating deielectric-coating of femtosecond green glow, and described is high-reflecting film to 600-1100nm to the high anti-deielectric-coating of parameter signals light; More preferably, described first concave mirror and the second concave mirror form tight focusing confocal resonance cavity configuration, and its radius of curvature is R=100mm.
8. Femtosecond OPO according to any one of claim 1 to 7, it is characterized in that, described first plane mirror and the second plane mirror are all being coated with the high anti-deielectric-coating of parameter signals light towards the one side of described confocal resonance cavity configuration, all non-plated film of another side; Preferably, described first plane mirror and the second plane mirror are all greater than 99.9% at the reflectivity at 600-1100nm place.
9. Femtosecond OPO according to any one of claim 1 to 8, it is characterized in that, described outgoing mirror is coated with the deielectric-coating in parameter signals optical band with output coupling efficiency towards the one side of the first plane mirror, and another side is coated with the anti-reflection deielectric-coating of parameter signals optical band; Preferably, described outgoing mirror is placed on an one-dimensional precise translation stage.
10. the application of the Femtosecond OPO according to any one of claim 1 to 9 in laser radar, bio-imaging, Ultrafast spectrum or ultrafast optical communication.
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