CN106451049B - 800 + -100 nm wave band high-repetition frequency all-fiber laser generating device - Google Patents
800 + -100 nm wave band high-repetition frequency all-fiber laser generating device Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 104
- 239000013307 optical fiber Substances 0.000 claims abstract description 32
- 230000010287 polarization Effects 0.000 claims abstract description 30
- 239000006185 dispersion Substances 0.000 claims abstract description 15
- 238000001228 spectrum Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 230000033228 biological regulation Effects 0.000 claims abstract 2
- 238000005086 pumping Methods 0.000 claims description 17
- 239000004038 photonic crystal Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 4
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 4
- 230000005374 Kerr effect Effects 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 abstract description 14
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052719 titanium Inorganic materials 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 6
- 229910052594 sapphire Inorganic materials 0.000 abstract description 4
- 239000010980 sapphire Substances 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000009022 nonlinear effect Effects 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract description 2
- 238000005253 cladding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007526 fusion splicing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
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- 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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
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Abstract
Description
技术领域Technical field
本发明涉及光纤激光装置技术领域，尤其涉及一种800±100nm波段高重频全光纤激光产生装置。The present invention relates to the technical field of fiber laser devices, and in particular to an 800±100nm band high repetition frequency all-fiber laser generating device.
背景技术Background technique
随着激光科学的发展，输出峰值波长在780nm的高能钛宝石激光光源被广泛应用于高次谐波产生、阿秒脉冲产生及天体物理等研究领域，具有重要价值。锁模钛宝石激光种子源极宽的发射谱(700nm-900nm)为高峰值功率钛宝石激光器的发展提供了充分条件，使其在高能量输出的同时，仍然可以维持较短的脉宽。然而，700nm-900nm钛宝石锁模激光种子源需要昂贵的Nd:YVO4/Nd:YLF倍频532nm激光器泵浦，致使其价格昂贵、空间结构繁多且维护困难。其次，对于输出波长在700nm-900nm，重频百kHz，脉冲能量μJ-几十μJ的钛宝石激光器来说，其通常是相对困难的实现。而且百kHz，脉冲能量μJ级的钛宝石激光器需要采用TEC甚至液氮制冷、导致结构复杂，且价格昂贵。这主要归因于钛宝石激光晶体低的热导率与效率。这些局限因素促使科研工作者又积极探索新的技术手段去实现价格低廉、性能稳定可靠的百kHz，μJ级的700-900nm激光光源，一定程度上弥补现有钛宝石激光光源的不足。With the development of laser science, high-energy titanium sapphire laser light sources with an output peak wavelength of 780nm are widely used in research fields such as higher harmonic generation, attosecond pulse generation, and astrophysics, and are of great value. The extremely broad emission spectrum (700nm-900nm) of the mode-locked Ti:sapphire laser seed source provides sufficient conditions for the development of high peak power Ti:sapphire lasers, which can still maintain short pulse widths while maintaining high energy output. However, the 700nm-900nm titanium sapphire mode-locked laser seed source requires expensive Nd:YVO 4 /Nd:YLF frequency-doubled 532nm laser pumping, making it expensive, with numerous spatial structures and difficult to maintain. Secondly, it is usually relatively difficult to implement a Ti:sapphire laser with an output wavelength between 700nm and 900nm, a repetition frequency of hundreds of kHz, and a pulse energy of μJ to tens of μJ. Moreover, titanium-sapphire lasers with hundreds of kHz and μJ-level pulse energy require TEC or even liquid nitrogen refrigeration, resulting in complex structures and high prices. This is mainly attributed to the low thermal conductivity and efficiency of titanium sapphire laser crystals. These limiting factors have prompted scientific researchers to actively explore new technical means to achieve low-cost, stable and reliable 100-kHz, μJ-level 700-900nm laser light sources, which to a certain extent make up for the shortcomings of existing titanium sapphire laser light sources.
发明内容Contents of the invention
鉴于此，有必要提供一种高性能、高集成、免维护且能降低成本的800±100nm波段高重频全光纤激光产生装置。In view of this, it is necessary to provide a high-performance, highly integrated, maintenance-free and cost-reduced 800±100nm band high repetition frequency all-fiber laser generation device.
一种800±100nm波段高重频全光纤激光产生装置，包括通过光纤依次连接的锁模光纤激光器、偏振控制器、在线起偏器、色散延迟器、第一光纤预放大器、频率控制器、第二光纤预放大器及主放大器。An 800±100nm band high repetition frequency all-fiber laser generation device, including a mode-locked fiber laser, a polarization controller, an online polarizer, a dispersion retarder, a first fiber preamplifier, a frequency controller, and a third fiber laser connected in sequence through optical fibers. Two optical fiber preamplifiers and main amplifier.
在其中一个实施例中，所述锁模光纤激光器采用掺镱全保偏锁模光纤激光振荡器，其中，锁模器件为半导体可饱和吸收镜、石墨烯、碳纳米管或拓扑绝缘体。In one embodiment, the mode-locked fiber laser uses an ytterbium-doped fully polarization-maintaining mode-locked fiber laser oscillator, where the mode-locking device is a semiconductor saturable absorber mirror, graphene, carbon nanotube, or topological insulator.
在其中一个实施例中，所述锁模光纤激光器的输出功率小于100mW，中心波长1000-1100nm，光谱宽度10±5nm，重频小于100MHz，脉冲宽度小于20ps。In one embodiment, the output power of the mode-locked fiber laser is less than 100 mW, the center wavelength is 1000-1100 nm, the spectral width is 10±5 nm, the repetition frequency is less than 100 MHz, and the pulse width is less than 20 ps.
在其中一个实施例中，所述偏振控制器采用非偏振保持光纤。In one embodiment, the polarization controller uses non-polarization maintaining optical fiber.
在其中一个实施例中，所述在线起偏器采用偏振保持光纤，且工作在单偏振状态。In one embodiment, the online polarizer uses polarization-maintaining optical fiber and operates in a single polarization state.
在其中一个实施例中，所述色散延迟器采用长度小于2000m偏振保持光纤。In one embodiment, the dispersion retarder uses a polarization-maintaining optical fiber with a length less than 2000m.
在其中一个实施例中，所述第一光纤预放大器采用长度为1m的掺镱单模增益光纤二极管纤芯泵浦激光放大器，输出信号功率小于250mW。In one embodiment, the first fiber preamplifier uses an ytterbium-doped single-mode gain fiber diode core-pumped laser amplifier with a length of 1 m, and the output signal power is less than 250 mW.
在其中一个实施例中，所述频率控制器采用基于声光效应器件或基于光克尔效应器件。In one embodiment, the frequency controller adopts an acousto-optic effect device or an optical Kerr effect device.
在其中一个实施例中，所述第二光纤预放大器为二极管泵浦掺镱双包层增益光纤激光放大器。In one embodiment, the second fiber preamplifier is a diode-pumped ytterbium-doped double-cladding gain fiber laser amplifier.
在其中一个实施例中，所述主放大器采用熔融拼接光子晶体增益光纤激光放大器，光子晶体增益光纤采用空间泵浦或合束器熔接泵浦，泵浦方式为正向泵浦或反向泵浦。In one embodiment, the main amplifier uses a fused spliced photonic crystal gain fiber laser amplifier, and the photonic crystal gain fiber uses space pumping or beam combiner fusion pumping, and the pumping method is forward pumping or reverse pumping. .
上述800±100nm波段高重频全光纤激光产生装置100，采用全光纤集成技术实现具有高重频高能量输出的高性能、高集成700-900nm激光光源，克服了现有装置采用钛宝石激光技术导致的空间结构繁多、操作维护困难等缺点，使得上述800±100nm波段高重频全光纤激光产生装置100结构较为简单，成本较低，且具有高可靠、免维护等优点。The above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device 100 uses all-fiber integration technology to achieve a high-performance, highly integrated 700-900nm laser light source with high repetition frequency and high energy output, overcoming the existing equipment using titanium sapphire laser technology. The resulting shortcomings such as numerous spatial structures and difficult operation and maintenance make the above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device 100 relatively simple in structure, low in cost, and highly reliable and maintenance-free.
附图说明Description of the drawings
图1为一实施方式的800±100nm波段高重频全光纤激光产生装置的结构示意图。Figure 1 is a schematic structural diagram of an 800±100nm band high repetition frequency all-fiber laser generation device according to one embodiment.
图2为实施例1的锁模光纤激光器10输出光谱图。Figure 2 is an output spectrum diagram of the mode-locked fiber laser 10 in Embodiment 1.
图3为实施例1的锁模光纤激光器10输出光经偏振控制器20与在线起偏器30调控后输出光谱图。FIG. 3 is an output spectrum diagram of the output light of the mode-locked fiber laser 10 in Embodiment 1 after being controlled by the polarization controller 20 and the online polarizer 30 .
图4为实施例1的800±100nm波段高重频全光纤激光产生装置在700-900nm波段输出光谱图。Figure 4 is an output spectrum diagram of the 800±100nm band high repetition frequency all-fiber laser generation device in the 700-900nm band in Embodiment 1.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清晰，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.
请参阅图1，一实施方式的800±100nm波段高重频全光纤激光产生装置100，包括通过光纤依次连接的锁模光纤激光器10、偏振控制器20、在线起偏器30、色散延迟器40、第一光纤预放大器50、频率控制器60、第二光纤预放大器70及主放大器80。Please refer to Figure 1. An 800±100nm band high repetition frequency all-fiber laser generation device 100 in one embodiment includes a mode-locked fiber laser 10, a polarization controller 20, an online polarizer 30, and a dispersion retarder 40 connected in sequence through optical fibers. , the first fiber preamplifier 50, the frequency controller 60, the second fiber preamplifier 70 and the main amplifier 80.
具体的，偏振控制器20置于锁模光纤激光器10和在线起偏器30之间，锁模光纤激光器10置于偏振控制器20前端，并与偏振控制器20通过光纤连接连接。该激光产生装置为全光纤熔融拼接结构。在线起偏器30前端与偏振控制器20另一端通过光纤连接。色散延迟器40置于在线起偏器30后端，并与在线起偏器30通过光纤熔融拼接。锁模光纤激光器10发出种子脉冲序列依次传输通过偏振控制器20和在线起偏器30后由色散延迟器40注入与之相邻的第一光纤预放大器50一侧。第一光纤预放大器50置于色散延迟器40和频率控制器60之间，第一光纤预放大器50前端于色散延迟器40另一侧通过光纤连接。频率控制器60置于第一光纤预放大器50后端，并与第一光纤预放大器50熔融拼接。第二光纤预放大器70置于频率控制器60与主放大器80之间。第二光纤预放大器70置于频率控制器60另一侧，并与频率控制器60通过光纤连接。主放大器80置于第二光纤预放大器70另一侧，并与第二光纤预放大器70熔融拼接，另一端作为输出。Specifically, the polarization controller 20 is placed between the mode-locked fiber laser 10 and the online polarizer 30 . The mode-locked fiber laser 10 is placed at the front end of the polarization controller 20 and is connected to the polarization controller 20 through an optical fiber connection. The laser generating device is an all-fiber fusion splicing structure. The front end of the online polarizer 30 and the other end of the polarization controller 20 are connected through optical fibers. The dispersion retarder 40 is placed at the rear end of the online polarizer 30 and is spliced with the online polarizer 30 through optical fiber fusion. The mode-locked fiber laser 10 emits a seed pulse sequence that is sequentially transmitted through the polarization controller 20 and then injected into the side of the adjacent first fiber preamplifier 50 by the dispersion retarder 40 after the linear polarizer 30 . The first optical fiber preamplifier 50 is placed between the dispersion retarder 40 and the frequency controller 60 , and the front end of the first optical fiber preamplifier 50 is connected to the other side of the dispersion retarder 40 through an optical fiber. The frequency controller 60 is placed at the rear end of the first optical fiber preamplifier 50 and is fused and spliced with the first optical fiber preamplifier 50 . The second optical fiber preamplifier 70 is placed between the frequency controller 60 and the main amplifier 80 . The second optical fiber preamplifier 70 is placed on the other side of the frequency controller 60 and is connected to the frequency controller 60 through optical fiber. The main amplifier 80 is placed on the other side of the second fiber preamplifier 70 and is fused and spliced with the second fiber preamplifier 70, with the other end serving as the output.
锁模光纤激光器10采用掺镱全保偏锁模光纤激光振荡器，其中，锁模器件可以为半导体可饱和吸收镜、石墨烯、碳纳米管或拓扑绝缘体等。The mode-locked fiber laser 10 adopts an ytterbium-doped fully polarization-maintaining mode-locked fiber laser oscillator, in which the mode-locking device can be a semiconductor saturable absorber mirror, graphene, carbon nanotube, or topological insulator.
锁模光纤激光器10的输出功率<100mW，中心波长1000-1100nm，光谱宽度10±5nm，重频<100MHz，脉冲宽度<20ps。The output power of the mode-locked fiber laser 10 is <100mW, the center wavelength is 1000-1100nm, the spectral width is 10±5nm, the repetition frequency is <100MHz, and the pulse width is <20ps.
偏振控制器20采用非偏振保持光纤。The polarization controller 20 uses non-polarization maintaining fiber.
在线起偏器30采用偏振保持光纤，且工作在单偏振状态。The online polarizer 30 uses polarization-maintaining optical fiber and works in a single polarization state.
色散延迟器40采用长度为<2000m偏振保持光纤。The dispersion retarder 40 uses polarization-maintaining fiber with a length of <2000m.
第一光纤预放大器50采用长度为1m的掺镱单模增益光纤二极管纤芯泵浦激光放大器，输出信号功率<250mW。The first optical fiber preamplifier 50 uses an ytterbium-doped single-mode gain fiber diode core pump laser amplifier with a length of 1 m, and the output signal power is <250 mW.
频率控制器60采用基于声光效应器件或基于光克尔效应器件。The frequency controller 60 adopts an acousto-optic effect device or an optical Kerr effect device.
第二光纤预放大器70为二极管泵浦掺镱双包层增益光纤激光放大器。The second fiber preamplifier 70 is a diode-pumped ytterbium-doped double-cladding gain fiber laser amplifier.
主放大器80采用熔融拼接光子晶体增益光纤激光放大器。光子晶体增益光纤可以采用空间泵浦或合束器熔接泵浦。泵浦方式可以为正向泵浦或反向泵浦。The main amplifier 80 adopts a fused spliced photonic crystal gain fiber laser amplifier. Photonic crystal gain fiber can be pumped using space pumping or beam combiner fusion splicing. The pumping method can be forward pumping or reverse pumping.
上述800±100nm波段高重频全光纤激光产生装置，基于对锁模光纤激光器输出的脉冲进行偏振调控原理，达到整形光谱效果，在经过后续增益光纤功率放大的同时结合光纤中非线性效应，实现具有800±100nm波段输出的高重频全光纤激光装置。上述800±100nm波段高重频全光纤激光产生装置可以作为高重频钛宝石激光放大器高性能、高集成光纤种子源。The above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device is based on the principle of polarization control of the pulse output from the mode-locked fiber laser to achieve a spectrum shaping effect. After subsequent gain fiber power amplification, it is combined with the nonlinear effect in the fiber to achieve High repetition frequency all-fiber laser device with 800±100nm band output. The above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device can be used as a high-performance, highly integrated fiber seed source for a high repetition frequency titanium sapphire laser amplifier.
上述800±100nm波段高重频全光纤激光产生装置100，采用全光纤集成技术实现具有高重频高能量输出的高性能、高集成700-900nm激光光源，克服了现有装置采用钛宝石激光技术导致的空间结构繁多、操作维护困难等缺点，使得上述800±100nm波段高重频全光纤激光产生装置100结构较为简单，成本较低，且具有高可靠、免维护等优点。The above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device 100 uses all-fiber integration technology to achieve a high-performance, highly integrated 700-900nm laser light source with high repetition frequency and high energy output, overcoming the existing equipment using titanium sapphire laser technology. The resulting shortcomings such as numerous spatial structures and difficult operation and maintenance make the above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device 100 relatively simple in structure, low in cost, and highly reliable and maintenance-free.
上述800±100nm波段高重频全光纤激光产生装置100，采用高增益、高效率、高光束质量、优秀散热性的光纤作为增益与传导介质、克服了块状钛宝石激光晶体低效率、低散热性等缺陷，使得其具有支持高重频高功率输出的优点。The above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device 100 uses optical fibers with high gain, high efficiency, high beam quality and excellent heat dissipation as gain and conduction media, overcoming the low efficiency and low heat dissipation of bulk titanium sapphire laser crystals. It has the advantage of supporting high repetition frequency and high power output due to its shortcomings.
上述800±100nm波段高重频全光纤激光产生装置100，采用二极管激光器泵浦，克服了钛宝石激光技术采用价格昂贵的Nd:YVO4/Nd:YLF倍频激光器泵浦的缺陷，使得其具有低成本的优点。The above-mentioned 800±100nm band high repetition frequency all-fiber laser generation device 100 adopts diode laser pumping, which overcomes the shortcomings of titanium sapphire laser technology using expensive Nd:YVO 4 /Nd:YLF frequency doubling laser pumping, making it Advantages of low cost.
实施例1Example 1
在如图1所示的800±100nm波段高重频全光纤激光产生装置100，锁模光纤激光器10选用输出中心波长1030.8nm，光谱半高全宽10nm，功率22.3mW，脉宽10ps，重频45MHzSESAM锁模全保偏激光振荡器。偏振控制器20采用手动式在线光纤偏振控制器，光纤类型为HI1060。在线起偏器30采用PM980偏振保持光纤。色散延迟器40为偏振保持单模光纤，长度为1100m。第一光纤预放大器50选用中心波长976nm，输出功率388mW单模激光二极管、保偏波分复用器、长度为1m偏振保持掺镱单模增益光纤(PM-YSF-HI)构成的二极管纤芯泵浦单模激光放大器。频率控制器60采用Gooch&Housego公司生产的全保偏光纤声光调制器。第二光纤预放大器70采用中心波长976nm，输出功率为791mW，芯径105μm多模激光二极管、保偏泵浦激光合束器、长度为60cm偏振保持掺镱双包层增益光纤(PLMA-YDF-10/125-VIII)构成的包层泵浦激光放大器。主放大器80采用输出功率9W，芯径105μm多模激光二极管、保偏多模泵浦合束器及NKT公司生产的长度为2m，芯径40μm，包层直径200μm保偏光子晶体增益光纤构成的全熔接增益模块。In the 800±100nm band high repetition frequency all-fiber laser generation device 100 shown in Figure 1, the mode-locked fiber laser 10 selects an output center wavelength of 1030.8nm, a spectrum full width at half maximum of 10nm, a power of 22.3mW, a pulse width of 10ps, and a repetition frequency of 45MHz SESAM lock. Full-mode polarization-maintaining laser oscillator. The polarization controller 20 adopts a manual online optical fiber polarization controller, and the optical fiber type is HI1060. The online polarizer 30 uses PM980 polarization maintaining optical fiber. The dispersion retarder 40 is a polarization-maintaining single-mode optical fiber with a length of 1100m. The first fiber preamplifier 50 uses a diode core composed of a single-mode laser diode with a center wavelength of 976 nm and an output power of 388 mW, a polarization-maintaining wavelength division multiplexer, and a polarization-maintaining ytterbium-doped single-mode gain fiber (PM-YSF-HI) with a length of 1 m. Pumped single-mode laser amplifier. The frequency controller 60 adopts a fully polarization-maintaining optical fiber acousto-optic modulator produced by Gooch & Housego Company. The second optical fiber preamplifier 70 adopts a central wavelength of 976 nm, an output power of 791 mW, a core diameter of 105 μm multi-mode laser diode, a polarization-maintaining pump laser beam combiner, and a length of 60 cm polarization-maintaining ytterbium-doped double-clad gain fiber (PLMA-YDF- 10/125-VIII) Cladding pump laser amplifier. The main amplifier 80 is composed of a multi-mode laser diode with an output power of 9W and a core diameter of 105 μm, a polarization-maintaining multi-mode pump combiner and a 2m-length, core diameter 40 μm, and cladding diameter 200 μm polarization-maintaining photonic crystal gain fiber produced by NKT. Fully fused gain module.
以上锁模光纤激光器10、偏振控制器20、在线起偏器30、色散延迟器40、第一光纤预放大器50、频率控制器60、第二光纤预放大器70及主放大器80均采用光纤熔融拼接，没有任何空间光路。锁模光纤激光器10发出的脉冲序列经偏振控制器20与在线起偏器30进行偏振调控，进而获得所需要的波谱输出，如图3所示。The above mode-locked fiber laser 10, polarization controller 20, online polarizer 30, dispersion retarder 40, first fiber preamplifier 50, frequency controller 60, second fiber preamplifier 70 and main amplifier 80 all adopt fiber fusion splicing. , without any spatial light path. The pulse sequence emitted by the mode-locked fiber laser 10 is polarized through the polarization controller 20 and the online polarizer 30 to obtain the required spectrum output, as shown in FIG. 3 .
被光谱调制后的脉冲经色散延迟器40进入第一光纤预放大器50，在388mW 976nm单模激光泵浦下，入射的光谱调制脉冲经过1m掺镱单模增益光纤被放大到210mW。经过第一光纤预放大器50后的脉冲序列由频率控制器60降频至275.9kHz，后经第二光纤预放大器70进一步放大后获得了10mW、275.9kHz激光输出。主放大器80将第二光纤预放大器70输出的放大脉冲激光进一步放大，同时结合放大过程中的非线性光学效应，最后产生了700-900nm波段激光输出，输出光谱如图4所示。The spectrally modulated pulse enters the first fiber preamplifier 50 through the dispersion retarder 40. Under the pumping of 388mW 976nm single-mode laser, the incident spectrally modulated pulse is amplified to 210mW through the 1m ytterbium-doped single-mode gain fiber. The pulse sequence after passing through the first optical fiber preamplifier 50 is down-converted to 275.9kHz by the frequency controller 60, and then further amplified by the second optical fiber preamplifier 70 to obtain a 10mW, 275.9kHz laser output. The main amplifier 80 further amplifies the amplified pulse laser output from the second fiber preamplifier 70, and combines the nonlinear optical effects during the amplification process to finally produce a laser output in the 700-900nm band. The output spectrum is shown in Figure 4.
以上仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be noted that those skilled in the art can also make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the present invention. protection scope of the invention.
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