TW202213888A - System and method for multibeam laser source, and multibeam laser source device - Google Patents

Abstract

A system and method for multi-beam laser source, and multi-beam laser source device are provided. The system for multi-beam laser source includes: a plurality of laser sources for providing a plurality laser beams have different wavelengths; fiber coupler for coupling laser beams into a same fiber; at least one pump source for providing pump source laser beam has a pump source wavelength which is shorter than signal source wavelengths; multi-beam laser source device, which includes fiber combiner for coupling laser source laser beams and pump source laser beam, Ion-doped gain fiber which has gain medium and signal source wavelengths are in the area of gain medium emission spectrum and pump source wavelength is in the area of gain medium absorption spectrum, and CPS which for stripping residual power of pump source laser beam which passed Ion-doped gain fiber and outputting multiple laser signal source laser beams which are enlarged.

Description

Multi-beam laser source system, multi-beam laser source amplification method, and multi-wavelength laser amplifier

The present invention relates to the field of laser technology, in particular to a multi-beam laser source system, a multi-beam laser source amplification method and a multi-wavelength laser amplifier.

As far as laser processing is concerned, it is widely used by processors because it is suitable for various materials including metals, non-metals, high hardness, high brittleness, high melting point, etc., and has high production efficiency.

However, traditional laser processing uses single-frequency lasers. If hard and brittle materials such as ceramics and silicon wafers are directly processed, the processed samples are easily damaged due to heat accumulation. In addition, single-frequency lasers are prone to slag when cutting metal sheets. And the phenomenon of coarser precision.

In recent years, dual-beam laser processing has been widely used to improve the quality of laser processing. The long-pulse waveband is used to preheat the processed object, and then the short-pulse waveband is used to instantly process the object to achieve minimum heat accumulation. For traditional single-beam (single wavelength) laser processing, especially for ceramic hard and brittle thin plates or precision metal sheet processing, dual-beam lasers can greatly reduce the breakage rate of hard and brittle materials and improve the precision of precision metal surface processing. 5G commodity industry) to bring more advanced applications.

The main principle of dual-beam laser processing is to use the first long-pulse high-power pulse laser to heat up the processed object to approach the processing threshold of the object, and at the same time use the second low-power short-pulse laser to instantly peel off the object. , in order to minimize the heat accumulation in the processing area; this is the biggest advantage of dual-beam laser processing.

There are two traditional double-beam laser generation methods. One is to couple two lasers with different wavelengths, different powers and different pulse widths on the same optical axis by means of spatial coupling; The excitation source does partial power conversion into another signal source and retains the remaining excitation source.

The deficiencies of the above two conventional methods include: excessive spatial coupling light loss (more than 10%), the optical axes of the double beams are not closely spaced, and the increase of the fiber aperture affects the beam quality, so the maximum effect of the double beam laser processing cannot be exerted.

In addition, the conventional method is limited to two beams, and is not suitable for processing applications with more than two beams, eg, three beams or more.

According to this, how to develop a "multi-beam laser source system, multi-beam laser source amplification method and multi-wavelength laser amplifier", which can reduce the loss of laser transmission (less than 5%) and solve the problem of multi-beam laser coaxial problem (100% tightness), and can greatly improve the quality of the laser beam, and maximize the application of multi-beam laser processing, which is an urgent problem to be solved by those in the relevant technical fields.

In one embodiment, the present invention provides a multi-beam laser source system, including: Multiple laser signal sources, each laser signal source provides a signal source laser beam, each signal source laser beam has a signal source wavelength, and the wavelengths of the multiple signal sources are different from each other; an optical fiber coupler for coupling the laser beam of the complex signal source into the same optical fiber; at least one pump source, each pump source is used to provide a pump source laser beam, the pump source laser beam has a pump source wavelength, and the pump source wavelength is smaller than the wavelength of the complex signal source; A multi-wavelength laser amplifier, including: an optical fiber combiner for connecting the optical fibers, and the optical fiber combiner is used for coupling the laser beam of the complex signal source and the laser beam of the pump source; A doped ion gain fiber is connected to a fiber combiner, and the fiber combiner transmits the complex signal source laser beam and the pump source laser beam to the doped ion gain fiber and amplifies the power of each signal source laser beam , the ion-doped gain fiber has a gain medium, the wavelength of the complex signal source falls within the range of the radiation spectrum of the gain medium, and the wavelength of the pump source falls within the range of the absorption spectrum of the gain medium; and A fiber coat power stripper is connected to the doped ion gain fiber to filter the energy of the pump source laser beam remaining after passing through the doped ion gain fiber, and output the power-amplified complex signal source laser beam .

In one embodiment, the present invention provides a method for amplifying a multi-beam laser source, comprising the following steps: (a) Coupling the laser beam of the complex signal source into an optical fiber by a fiber coupler; (b) coupling the complex signal source laser beam and the pump source laser beam into the doped ion gain fiber by the fiber combiner, the complex signal source laser beam is transmitted in the core of the doped ion gain fiber, and The pump source laser beam is transmitted in the fiber coat of the doped ion gain fiber; (c) The pump source laser beam first amplifies the signal source laser beam of the smallest wavelength, and then uses part of the amplified signal source laser beam of the smallest wavelength to amplify the signal source laser beam of the second smallest wavelength, and so on, until All source laser beam powers are amplified; and (d) The energy of the pump source laser beam remaining after passing through the ion-doped gain fiber is filtered out by the fiber coat power stripper, and a plurality of signal source laser beams after power amplification are output.

In one embodiment, the present invention provides a multi-wavelength laser amplifier, comprising: An optical fiber coupler is connected to an optical fiber, and the optical fiber coupler is used to couple the complex signal source laser beam and the pump source laser beam; each signal source laser beam has a signal source wavelength, and the complex signal source wavelengths are different from each other; The laser beam of the pump source has a wavelength of the pump source, and the wavelength of the pump source is smaller than the wavelength of the complex signal source; A doped ion gain fiber is connected to a fiber combiner. The fiber combiner transmits the complex signal source laser beam and the pump source laser beam to the doped ion gain fiber and performs wavelength synchronization power amplification of the complex signal source. The ion gain fiber has a gain medium, the wavelength of the complex signal source falls within the range of the emission spectrum of the gain medium, and the wavelength of the pump source falls within the range of the absorption spectrum of the gain medium; and A fiber coat power stripper, connected to the doped ion gain fiber, used to filter the power of the remaining pump source laser beam after passing through the doped ion gain fiber, and output a plurality of signal source lasers after power amplification beam.

Please refer to FIG. 1 and FIG. 2 , a multi-beam laser source system 100 provided by the present invention includes two laser signal sources 1 and 2 , a fiber coupler 3 , a pump source 5 and a plurality of A multi-wavelength laser amplifier 10 . The multi-wavelength laser amplifier 10 is composed of a fiber combiner 11 , an ion-doped gain fiber 12 and a coat power stripper (CPS) 13 .

Each laser signal source 1, 2 can provide a signal source laser beam L1, L2, each signal source laser beam L1, L2 has a signal source wavelength, and the signal source wavelengths of the signal source laser beams L1, L2 are mutually Not the same. In addition, the powers of the signal source laser beams L1 and L2 provided by each of the laser signal sources 1 and 2 are different from each other, and the magnitude order of the complex powers is opposite to that of the wavelengths of the complex signal sources. And, each signal source laser beam L1, L2 has a pulse width, the pulse widths are different from each other, and the magnitude order of the pulse widths is opposite to the magnitude order of the signal source wavelengths.

For example, the signal source laser beam L1 provided by the laser signal source 1 has the signal source wavelength λ1, the power W1 and the pulse width PW1, and the signal source laser beam L2 provided by the laser signal source 2 has the signal source wavelength λ2, power W2 and pulse width PW2; if λ1<λ2, then W1>W2, and PW1>PW2.

The optical fiber coupler 3 is used to couple the laser beams L1 and L2 of the signal source into the same optical fiber 4 ; the type of the optical fiber coupler 3 is not limited, for example, it can be a wavelength division multiplexing (WDM).

The pump source 5 is used for providing a pump source laser beam L3, the pump source laser beam L3 has a pump source wavelength, and the pump source wavelength is smaller than the wavelength of each signal source.

For example, the pump source wavelength is λ3. If the signal source wavelength λ1 of the signal source laser beam L1 < the signal source wavelength λ2 of the signal source laser beam L2, then λ3<λ1<λ2.

The optical fiber coupler 11 is connected to the optical fiber 4, and the optical fiber coupler 11 is used for coupling the signal source laser beams L1, L2 and the pump source laser beam L3.

The doped ion gain fiber 12 is connected to the fiber combiner 11, and the fiber combiner 11 transmits the signal source laser beams L1, L2 and the pump source laser beam L3 to the doped ion gain fiber 12 and connects each signal source laser beam L3 to the doped ion gain fiber 12. Power amplification of the beams L1 and L2. The ion-doped gain fiber 12 has a gain medium. The signal source wavelength λ1 of the signal source laser beam L1 and the signal source wavelength λ2 of the signal source laser beam L2 both fall within the range of the radiation spectrum of the gain medium. The pump source wavelength λ3 falls within the range of the absorption spectrum of the gain medium.

Please refer to FIG. 3 , A1 represents the absorption spectrum of ytterbium ions, and E1 represents the emission spectrum of ytterbium ions. When the ions doped in the doped ion gain fiber 12 are ytterbium ions, the signal source wavelength λ1 of the signal source laser beam L1 and the The signal source wavelength λ2 of the signal source laser beam L2 falls within the range of the radiation spectrum E1 of the gain medium, and the pump source wavelength λ3 falls within the range of the absorption spectrum A1 of the gain medium.

Please refer to FIGS. 4A , 4B and 5 to show the absorption emission spectra of erbium ions and fluorine ions, respectively. The laser signal source 1 , the laser signal source 2 and the pump applicable to the present invention are selected according to the absorption radiation bands of erbium ions and fluorine ions. The source 5 makes the signal source wavelength λ1 of the signal source laser beam L1 and the signal source wavelength λ2 of the signal source laser beam L2 both fall within the range of the erbium ion emission spectrum E2 and the ion emission spectrum E4 of the gain medium, and the pumping The source wavelength λ3 falls within the range of the erbium ion absorption spectrum A2 and the Qin ion absorption spectrum A4 of the gain medium.

The ions doped in the doped ion gain fiber 12 can be ytterbium ions, erbium ions, pyrite ions, or other ions with similar effects. In Figures 3, 4A, 4B, and 5, the ordinates of each figure are different (for example, cross-section, absorption, radiation, degree, etc.), but the abscissas are all wavelengths, because these figures are only schematic illustrations When the ions doped in the doped ion gain fiber 12 are different, the corresponding laser signal source 1 , laser signal source 2 and pump source 5 should be selected according to the wavelength band of its absorption radiation spectrum.

The fiber coat power stripper 13 is connected to the doped ion gain fiber 12 to filter out the energy of the pump source laser beam L3 remaining after passing through the doped ion gain fiber 12, and to output the power-amplified complex signal source laser beam. beams LL1 and LL2.

That is, after the signal source laser beams L1 and L2 and the pump source laser beam L3 provided by the laser signal sources 1 and 2 and the pump source 5 are input into the multi-beam laser source system 100 provided by the present invention, The signal source laser beams LL1 and LL2 with simultaneous power amplification can be output at the same time.

Please refer to FIG. 1 and FIG. 2 to illustrate a method for amplifying a multi-beam laser source using the multi-beam laser source system 100 provided by the present invention, which includes the following steps:

Step (a): The signal source laser beams L1 and L2 are coupled into the same fiber 4 by the fiber coupler 3 .

Step (b): The signal source laser beams L1, L2 and the pump source laser beam L3 are coupled into the doped ion gain fiber 12 by the fiber combiner 11, and the signal source laser beams L1, L2 are in the doped ion gain. The laser beam L3 of the pump source is transmitted in the fiber core 121 of the optical fiber 12 , and the pump source laser beam L3 is transmitted in the fiber coating 122 of the doped ion gain fiber 12 .

Step (c): The pump source laser beam L3 first amplifies the signal source laser beam of the minimum wavelength, and then uses part of the amplified signal source laser beam of the minimum wavelength to amplify the signal source laser beam of the sub-smallest wavelength, so as to And so on, until the power of all signal source laser beams are amplified.

Taking the aforementioned example that the signal source wavelength λ1 of the signal source laser beam L1 is smaller than the signal source wavelength λ2 of the signal source laser beam L2, the pump source laser beam L3 first amplifies the signal source laser beam L1, and then uses part of the The amplified signal source laser beam L1 amplifies the signal source laser beam L2 of the sub-smaller wavelength. At this time, the laser signal source 1 can be regarded as a sub-pumping source.

Step (d): The fiber coat power stripper 13 filters out the energy of the pump source laser beam L3 remaining after passing through the ion-doped gain fiber 12, and outputs the power-amplified signal source laser beams LL1 and LL2 .

Referring to FIG. 6, a multi-beam laser source system 200 provided by the present invention includes three laser signal sources 1, 2, 6, a fiber coupler 3, a pump source 5 and a plurality of A Hybrid-wavelength laser amplifier 10 . The multi-wavelength laser amplifier 10 is composed of a fiber combiner 11 , an ion-doped gain fiber 12 and a coat power stripper (CPS) 13 .

The main difference between this embodiment and the embodiment of FIG. 1 is that this embodiment has three laser signal sources 1 , 2 , and 6 , and each laser signal source 1 , 2 , and 6 can provide a signal source laser beam L1 , L2 , L4. Each of the signal source laser beams L1 , L2 and L4 has a signal source wavelength, and the signal source wavelengths of the signal source laser beams L1 , L2 and L4 are different from each other. In addition, the powers of the signal source laser beams L1 , L2 , and L4 provided by each laser signal source 1 , 2 , and 4 are different from each other, and the magnitude order of the complex powers is opposite to that of the wavelengths of the complex signal sources. And, each signal source laser beam L1 , L2 , L4 has a pulse width, the pulse widths are different from each other, and the magnitude order of the pulse widths is opposite to that of the signal source wavelengths.

For example, the signal source laser beam L1 provided by the laser signal source 1 has the signal source wavelength λ1, the power W1 and the pulse width PW1, and the signal source laser beam L2 provided by the laser signal source 2 has the signal source wavelength λ2, power W2 and pulse width PW2, the signal source laser beam L4 provided by the laser signal source 6 has the signal source wavelength λ4, power W4 and pulse width PW4; if λ1<λ2<λ4, then W1>W2>W4, PW1>PW2 >PW4.

The fiber coupler 3 is used to couple the laser beams L1 , L2 and L4 of the signal source into the same fiber 4 ; the fiber coupler 3 is not limited in type, for example, it can be a wavelength division multiplexing (WDM).

The pump source 5 is used for providing a pump source laser beam L3, the pump source laser beam L3 has a pump source wavelength, and the pump source wavelength is smaller than the wavelength of each signal source.

For example, the pump source wavelength is λ3, if the signal source wavelength λ1 of the signal source laser beam L1 < the signal source wavelength λ2 of the signal source laser beam L2, the signal source wavelength λ2 of the signal source laser beam L2 < the signal source laser beam For the signal source wavelength λ4 of the light beam L4, λ3<λ1<λ2<λ4.

The optical fiber coupler 11 is connected to the optical fiber 4, and the optical fiber coupler 11 is used for coupling the signal source laser beams L1, L2, L4 and the pump source laser beam L3.

The doped ion gain fiber 12 is connected to the fiber combiner 11, and the fiber combiner 11 transmits the signal source laser beams L1, L2, L4 and the pump source laser beam L3 to the doped ion gain fiber 12 and connects each signal Power amplification of source laser beams L1, L2, L4. The ion-doped gain fiber 12 has a gain medium, and the signal source wavelength λ1 of the signal source laser beam L1, the signal source wavelength λ2 of the signal source laser beam L2 and the signal source wavelength λ4 of the signal source laser beam L4 are all within the gain In the range of the emission spectrum of the medium, the pump source wavelength λ3 falls within the range of the absorption spectrum of the gain medium.

The fiber coat power stripper 13 is connected to the doped ion gain fiber 12 to filter out the energy of the pump source laser beam L3 remaining after passing through the doped ion gain fiber 12, and output the signal source laser after power amplification Light beams LL1, LL2, LL4.

The embodiment of FIG. 1 and the embodiment of FIG. 6 illustrate that the number of laser signal sources of the present invention is not limited, and may be two or more.

In order to verify the practicability of the present invention, the applicant conducted experiments. Please refer to Example 1 shown in the table below: Example 1: laser signal source Signal source wavelength power before amplification Amplified power power magnification S1 1030nm 6.5W 380W 58.5 S2 1080nm 0.4W 20W 50

In Example 1, two laser signal sources S1 and S2 are selected, and the selected doped ion gain fiber is a doped ytterbium ion gain fiber, and its ion absorption radiation spectrum is shown in FIG. 3 . The wavelength of the pump source selected according to the absorption emission spectrum of the doped ytterbium ion gain fiber is 915nm, the wavelength of the signal source of the laser signal source S1 is 1030nm, and the power before amplification is 6.5W; the wavelength of the signal source of the laser signal source S2 is 1080nm, and the power before amplification is 0.4W. The magnitude order of the signal source wavelength is opposite to the magnitude order of the power before amplification or/and after amplification.

Using a multi-beam laser source system 100 provided by the present invention shown in FIG. 1 , the power of the laser signal source S1 with the signal source wavelength of 1030 nm can be amplified from 6.5W to 380W, and the laser signal with the signal source wavelength of 1080 nm can be amplified The power of source S2 is amplified from 0.4W to 20W.

Next, in the second embodiment, three laser signal sources S1, S2, and S3 are selected. Example 2: laser signal source Signal source wavelength power before amplification Amplified power power magnification S1 1030nm 3W 58W 19.3 S2 1064nm 0.5W 8W 16 S3 1080nm 0.1W 1.5W 15

Using a multi-beam laser source system 100 provided by the present invention as shown in FIG. 1 , the power of the laser signal source S1 with a signal source wavelength of 1030 nm can be amplified from 3W to 58W, and the laser signal with a signal source wavelength of 1064 nm can be amplified. The power of the source S2 is amplified from 0.5W to 8W, and the power of the laser signal source S3 with the signal source wavelength of 1080nm is amplified from 0.1W to 1.5W. Similarly, the magnitude order of the signal source wavelength is opposite to the magnitude order of the power before amplification or/and after amplification

It is worth noting that if the wavelengths of the selected laser signal sources are the same, only the high-power laser signal source will be amplified due to the ion optical characteristics, while the low-power laser signal source has almost no amplification effect. See Example 3 shown in the table below. Example 3: laser signal source Signal source wavelength power before amplification Amplified power power magnification S1 1030nm 6.5W 500W 76.9 S2 1030nm 0.4W 0.65W 1.6

The doped ion gain fiber selected in Example 3 is a ytterbium ion gain fiber, and the wavelengths of the selected laser signal sources are all 1030 nm, but the powers are different, 6.5W and 0.4W respectively, provided by the present invention. After the amplification of the multi-beam laser source system, the 6.5W laser signal source S1 is amplified to 500W, and the power amplification is 76.9; as for the 0.4W laser signal source S2, the amplification is 0.65W, and the power amplification is only 1.6 .

Embodiment 3 illustrates that when selecting a laser signal source, the signal source wavelengths of each laser signal source should be different from each other to achieve better efficiency.

To sum up, the multi-beam laser source system provided by the present invention utilizes that the doped ions in different gain fibers have absorption and emission spectrum energy level characteristics, and a hierarchical excitation source phenomenon is generated in the gain fibers to achieve the same gain. The phenomenon of multi-pumping of fiber amplifiers allows multiple laser signals of different wavelengths (complex beams) to coexist and amplify synchronously in the same fiber amplifier, thereby simplifying the fiber system and improving the beam quality.

In addition, the present invention adopts an all-fiber structure design, which can reduce the loss of laser transmission (less than 5%), solve the coaxial problem of multi-beam lasers (100% tightness), and can greatly improve the quality of laser beams. Laser processing applications are maximized, not limited to dual beams.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

100,200: Beam Laser Source System 1,2,6,S1,S2,S3: Laser signal source 3: Fiber Coupler 4: Optical fiber 5: Pump source 10: Multi-wavelength laser amplifier 11: Optical fiber combiner 12: Doped ion gain fiber 121: Core 122: Slender Clothes 13: Fiber Clothes Power Stripper A1: Ytterbium ion absorption spectrum A2: Erbium ion absorption spectrum A4: Qin ion absorption spectrum E1: Ytterbium ion emission spectrum E2: Erbium ion emission spectrum E4: Qin ion emission spectrum L1, L2, L4: Signal source laser beam L3: Pump source laser beam LL1, LL2, LL4: Amplified signal source laser beam PW1, PW2, PW4: Pulse width W1, W2, W4: Power λ1, λ2, λ4: Signal source wavelength λ3: Pump source wavelength

FIG. 1 is a system schematic diagram of an embodiment of the multi-beam laser source system of the present invention. FIG. 2 is a schematic diagram of amplifying a laser signal source using a pump source according to the present invention. Figure 3 shows the absorption emission spectrum of ytterbium ions. FIG. 4A shows the absorption spectrum of erbium ions in a frequency band. FIG. 4B shows the absorption emission spectrum of erbium ions in another frequency band. Figure 5 is the absorption emission spectrum of Qin ion. FIG. 6 is a system schematic diagram of another embodiment of the multi-beam laser source system of the present invention.

100: Beam Laser Source System

1,2: Laser signal source

3: Fiber Coupler

4: Optical fiber

5: Pump source

10: Multi-wavelength laser amplifier

11: Optical fiber combiner

12: Doped ion gain fiber

13: Fiber Clothes Power Stripper

L1, L2: Signal source laser beam

L3: Pump source laser beam

LL1,LL2: Amplified signal source laser beam

Claims (8)

A multi-beam laser source system, comprising: a plurality of laser signal sources, each of the laser signal sources provides a signal source laser beam, each of the signal source laser beams has a signal source wavelength, and the wavelengths of the plurality of signal sources are different from each other; an optical fiber coupler for coupling the laser beam of the complex signal source into the same optical fiber; at least one pump source, each of which is used to provide a pump source laser beam, the pump source laser beam has a pump source wavelength, and the pump source wavelength is smaller than the complex signal source wavelength; A multi-wavelength laser amplifier, including: an optical fiber combiner connected to the optical fiber, and the optical fiber combiner is used for coupling the laser beam of the complex signal source and the laser beam of the pump source; A doped ion gain fiber is connected to the fiber combiner, and the fiber combiner transmits the complex signal source laser beam and the pump source laser beam into the doped ion gain fiber and connects each signal source Power amplification of laser beam, the doped ion gain fiber has a gain medium, the wavelength of the complex signal source falls within the range of the emission spectrum of the gain medium, and the wavelength of the pump source falls within the range of the absorption spectrum of the gain medium in; and A fiber coat power stripper connected to the doped ion gain fiber for filtering the energy of the pump source laser beam remaining after passing through the doped ion gain fiber, and outputting the power-amplified complex signal source laser beam. The multi-beam laser source system according to claim 1, wherein the ions doped in the doped ion gain fiber are one of ytterbium ions, erbium ions, and fluorine ions. The multi-beam laser source system of claim 1, wherein the power of the signal source laser beam provided by each of the laser signal sources is different from each other, and the magnitude order of the complex power is related to the wavelength of the complex signal source are in reverse order of size. The multi-beam laser source system of claim 1, wherein each of the signal source laser beams has a pulse width, the complex pulse widths are different from each other, and the magnitude order of the complex pulse widths is different from the wavelength of the complex signal source. The size order is reversed. The multi-beam laser source system of claim 1, wherein the fiber coupler is a wavelength division multiplexing (WDM). A method for amplifying a multi-beam laser source using the multi-beam laser source system described in any one of claims 1 to 5, comprising the following steps: (a) coupling the complex signal source laser beam into an optical fiber by the fiber coupler; (b) Coupling the complex signal source laser beam and the pump source laser beam into the doped ion gain fiber by the fiber combiner, and the complex signal source laser beam in the fiber of the doped ion gain fiber is transmitted in the core, and the pump source laser beam is transmitted in the fiber coat of the doped ion gain fiber; (c) The pump source laser beam first amplifies the signal source laser beam of the minimum wavelength, and then uses part of the amplified signal source laser beam of the minimum wavelength to amplify the signal source laser beam of the sub-smallest wavelength, so as to And so on, until all the power of the source laser beam is amplified; and (d) filtering out the energy of the pump source laser beam remaining after passing through the doped ion gain fiber by the fiber coat power stripper, and outputting the plurality of signal source laser beams after power amplification. A multi-wavelength laser amplifier, comprising: An optical fiber coupler is connected to an optical fiber, and the optical fiber coupler is used to couple the complex signal source laser beam and the pump source laser beam; each of the signal source laser beams has a signal source wavelength, and the complex signal source wavelengths are different from each other. The same; the pump source laser beam has a pump source wavelength, and the pump source wavelength is smaller than the complex signal source wavelength; A doped ion gain fiber is connected to the fiber combiner, and the fiber combiner transmits the complex signal source laser beam and the pump source laser beam to the doped ion gain fiber and conducts the complex signal source wavelength Synchronous power amplification, the doped ion gain fiber has a gain medium, the wavelength of the complex signal source falls within the range of the emission spectrum of the gain medium, and the wavelength of the pump source falls within the range of the absorption spectrum of the gain medium; and A fiber coat power stripper, connected to the doped ion gain fiber, for filtering the power of the pump source laser beam remaining after passing through the doped ion gain fiber, and outputting the plurality of power-amplified laser beams Signal source laser beam. The multi-wavelength laser amplifier of claim 7, wherein the ions doped in the doped ion gain fiber are one of ytterbium ions, erbium ions, and pyrite ions.

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