WO2015172700A1 - Visible light super-continuum spectrum light source based on green-light fiber laser pumping - Google Patents

Visible light super-continuum spectrum light source based on green-light fiber laser pumping Download PDF

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WO2015172700A1
WO2015172700A1 PCT/CN2015/078718 CN2015078718W WO2015172700A1 WO 2015172700 A1 WO2015172700 A1 WO 2015172700A1 CN 2015078718 W CN2015078718 W CN 2015078718W WO 2015172700 A1 WO2015172700 A1 WO 2015172700A1
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fiber
laser
green
light
frequency
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PCT/CN2015/078718
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French (fr)
Chinese (zh)
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阮双琛
郭春雨
林怀钦
余军
赵俊清
闫培光
华萍
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深圳大学
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Publication of WO2015172700A1 publication Critical patent/WO2015172700A1/en

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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
    • H01S3/05—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
    • 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

Definitions

  • the present invention relates to the field of optical fiber technologies, and in particular, to a visible light supercontinuum source light source based on green light fiber laser pumping.
  • Fiber supercontinuum source can produce high-brightness and high-coherence broadband light, which is equivalent to broadband laser. It has important application prospects in biomedicine, laser spectroscopy, environmental monitoring, remote sensing and other fields, especially super-continuous spectrum in visible light. It has irreplaceable application value in the fields of cytology, biomedical imaging, and biospectral analysis.
  • the current mainstream technology for generating supercontinuum is to take advantage of the mature Realized by 1 ⁇ m, 1.5 ⁇ m or 2 ⁇ m fiber laser pumping, causing most of the energy in the output supercontinuum to concentrate at 800 nm In the above infrared band, the energy conversion efficiency to the pure visible light band is very low.
  • the well-known supercontinuum source supplier Fianium, UK
  • Fianium UK
  • Another well-known supercontinuum supplier NKT, Denmark
  • has developed a visible-enhanced supercontinuum source that improves conversion efficiency in the visible range, but even so, the output is 8 W.
  • Supercontinuum source is only 2 W in the visible range
  • the output power, but also the use of the spectral beam splitter in it can be used to separate the visible spectrum spectrum output.
  • the low conversion efficiency and power utilization of conventional supercontinuum sources in the visible range greatly limits the application of visible light supercontinuum.
  • the technical problem to be solved by the present invention is that the spectral energy of the supercontinuum source in the prior art is too low in the visible light band, thereby limiting the application of the visible light supercontinuum.
  • the present invention is intended to provide a green optical fiber. Laser-pumped visible light supercontinuum sources allow spectral energy to be concentrated in the visible range.
  • a visible light supercontinuum source light sourced by a green light fiber laser pump comprising a green light fiber laser, a photonic crystal fiber, and a first fiber end cap connected in sequence;
  • the green fiber laser is used to generate a green laser as a pumping light of the photonic crystal fiber to output a supercontinuum spectrum of the photonic crystal fiber;
  • the first fiber end cap is configured to avoid end surface reflection of the photonic crystal fiber
  • the green fiber laser includes sequential connections:
  • a polarization-dependent fiber optic isolator for preventing the fundamental frequency light from being fed back to the linearly polarized narrow linewidth fiber laser
  • An all-fiber laser frequency multiplier for multiplying a fundamental frequency light output by the polarization-dependent optical fiber isolator to generate a green frequency doubled laser
  • the all-fiber laser frequency multiplier is any one of the following two structures:
  • the all-fiber laser frequency multiplier includes sequential connections:
  • a laser frequency multiplier input fiber for receiving a fundamental frequency light output by the polarization dependent fiber isolator
  • a first coreless optical fiber for performing beam expansion and transmission on a fundamental light input through the input end of the laser frequency multiplier input fiber
  • a first Grin fiber for collimating and focusing the fundamental light input after the first coreless fiber is expanded and transmitted;
  • a second coreless optical fiber for performing focus transmission on the collimated and focused fundamental frequency light of the first Grin optical fiber
  • a frequency doubling crystal for multiplying a fundamental frequency light input after being focused and transmitted by the second coreless fiber to generate a green frequency doubled laser
  • a third coreless fiber for performing beam expansion transmission on the green frequency doubled laser generated by the frequency doubling crystal
  • a second Grin fiber for collimating and focusing the green frequency doubled laser input after the third coreless fiber is expanded and transmitted;
  • a fourth coreless optical fiber configured to perform focus transmission on the green double-frequency laser that is collimated and focused by the second Grin fiber
  • a laser frequency multiplier output fiber for outputting a green frequency doubled laser input after being focused and transmitted by the fourth coreless fiber, as pumping light for pumping the photonic crystal fiber;
  • the all-fiber laser frequency multiplier includes sequential connections:
  • a laser frequency multiplier input fiber for receiving a fundamental frequency light output by the polarization dependent fiber isolator
  • a second fiber end cap for expanding and transmitting the fundamental light input through the input fiber of the laser frequency multiplier, and avoiding end surface reflection
  • a first laser collimating lens for collimating the fundamental light input after the second fiber end cap is expanded and transmitted
  • a first laser focusing lens for focusing a fundamental light that is collimated by the first laser collimating lens
  • a frequency doubling crystal for multiplying a fundamental frequency light that is focused by the first laser focusing lens to generate a green frequency doubling laser
  • a second laser collimating lens for collimating the green frequency doubled laser generated by the frequency doubling crystal
  • a second laser focusing lens for focusing a green double-frequency laser that is collimated by the second laser collimating lens
  • a third fiber end cap for avoiding end surface reflection and outputting a green frequency doubled laser focused by the second laser focusing lens
  • a laser frequency multiplier output fiber for outputting a green frequency doubled laser input through the third fiber end cap
  • An output end of the polarization dependent fiber optic isolator is coupled to the laser frequency multiplier input fiber;
  • the laser frequency multiplier output fiber is coupled to the photonic crystal fiber.
  • the laser frequency multiplier output fiber is a single mode polarization maintaining fiber with a cutoff wavelength of less than 0.5 ⁇ m.
  • the linear polarization narrow linewidth fiber laser has a pulse width of no more than 10 picoseconds
  • the photonic crystal fiber is a non-tapered quartz photonic crystal fiber or a tapered quartz photonic crystal fiber;
  • the zero-dispersion wavelength of the non-tapered quartz photonic crystal fiber is located in the near-infrared band
  • the zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser.
  • linear polarization narrow linewidth fiber laser has a pulse width greater than 10 picoseconds
  • the photonic crystal fiber is a tapered quartz photonic crystal fiber
  • the zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser.
  • the linearly polarized narrow linewidth fiber laser is a Yb-doped fiber laser having a working wavelength of 1 ⁇ m.
  • optical fiber at the output end of the linear polarization narrow linewidth fiber laser, the optical fiber at the input end and the output end of the polarization dependent fiber isolator, and the input fiber of the laser frequency multiplier are the polarization maintaining fibers having the same parameters.
  • the present invention generates pump light through a fully opticalized green fiber laser, through Grin
  • the fiber coupling technology or the lens coupling technology makes the spectral energy of the supercontinuum source mainly concentrated in the visible light band, which can greatly increase the power of the supercontinuum source in the visible light band of the current power condition, so that a wider range of visible light can be realized.
  • Supercontinuum applications are possible.
  • FIG. 1 is a schematic structural view of a visible light supercontinuum source based on a green fiber laser pump according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic structural view of another visible light supercontinuum light source pumped by a green light fiber laser according to Embodiment 2 of the present invention.
  • the light sources of the two structures each include a green fiber laser 1, a photonic crystal fiber 2, and a first fiber end cap 3 which are sequentially connected.
  • the green fiber laser 1 is used to generate green light as pump light for pumping the photonic crystal fiber 2.
  • the first fiber end cap 3 is used to prevent the end face reflection of the photonic crystal fiber 2, so that the laser light output through the photonic crystal fiber 2 is not reflected back to the green fiber laser 1 due to the reflection of the end face thereof, thereby protecting the green fiber laser 1 Free from damage.
  • the green fiber laser 1 includes a linearly polarized narrow linewidth fiber laser 11, a polarization dependent fiber isolator 12, and an all-fiber laser frequency multiplier 14 which are sequentially connected.
  • the linearly polarized narrow linewidth fiber laser 11 is used to generate fundamental light.
  • the polarization-dependent fiber optic isolator 12 is used to ensure that the generated fundamental frequency light is transmitted unidirectionally, preventing damage to the system caused by the feedback back-line polarization narrow linewidth fiber laser 1.
  • the all-fiber laser frequency multiplier 14 is used to multiply the fundamental light output from the polarization-dependent optical fiber isolator 12 to generate the above-mentioned green light.
  • the linearly polarized narrow linewidth fiber laser preferably uses a Yb-doped fiber laser with a working wavelength of 1 ⁇ m.
  • the Yb-doped fiber laser has a gain bandwidth, a wide tunable range, and high gain and High energy conversion efficiency, which outputs a 1 ⁇ m linearly polarized narrow linewidth laser as the fundamental light.
  • the fundamental frequency light is multiplied into the all-fiber laser frequency multiplier 14 via the polarization-dependent optical fiber isolator 12 to obtain green light having a wavelength of 0.5 ⁇ m.
  • the fiber at the output end of the linearly polarized narrow linewidth fiber laser 11 and the input end and the output end of the polarization dependent fiber isolator 12 are polarization-maintaining fibers having the same parameters.
  • the light sources of the above two structures are different in that the structure of the all-fiber laser frequency multiplier 14 is different.
  • the all-fiber laser frequency multiplier 14 includes a laser multiplier input fiber 1401, a first coreless fiber 1402, a first Grin fiber 1403, and a second corelessly connected in sequence.
  • the laser frequency multiplier input fiber 1401 is configured to receive the fundamental frequency light output by the polarization dependent fiber isolator 12.
  • the combination of the laser frequency multiplier input fiber 1401, the first coreless fiber 1402 and the first Grin fiber 1403 is equivalent to a spatial focusing lens and a free space before and after it, which uses the principle of self-focusing to collimate and focus the fundamental light to Frequency doubling crystal 1405 center.
  • the first coreless fiber 1402 is used for beam expanding transmission of the fundamental frequency light input through the laser frequency multiplier input fiber 1401 to achieve a relatively large spot diameter when entering the first Grin fiber 1403.
  • the so-called beam expansion transmission means that the first coreless fiber 1402 is equivalent to the free space in front of the spatial focusing lens, and the fundamental frequency light received by the laser frequency multiplier input fiber 1401 enters the first coreless fiber 1402, and is in the first In the core fiber 1402, during transmission, the beam of the fundamental light gradually diverges, thereby expanding the beam.
  • the length of the first coreless fiber 1402 can be calculated according to actual needs. After the baseband light is expanded and transmitted through the first coreless fiber 1402, it enters the first Grin fiber 1403. The first Grin fiber 1403 is used for collimating and focusing the fundamental light input after the first coreless fiber 1402 is expanded and transmitted.
  • the second coreless fiber 1404 is used for focusing transmission of the collimated and focused fundamental light transmitted through the first Grin fiber 1403 so as to be focused at the center of the frequency doubling crystal 1405 as a minimum waist spot.
  • the so-called focus transmission means that the second coreless fiber 1404 corresponds to a free space after the spatial focusing lens.
  • the first Grin fiber 1403 collimates and the focused baseband light enters the second coreless fiber 1404, it is transmitted in the second coreless fiber 1404.
  • the fundamental light beam gradually gathers, thereby focusing.
  • the length of the second coreless fiber 1404 can be calculated according to actual needs. After the fundamental light is focused and transmitted through the second coreless fiber 1404, it enters the frequency doubling crystal 1405.
  • the frequency doubling crystal 1405 is used to multiply the fundamental frequency light input after the second coreless fiber 1404 is focused and transmitted to generate a green frequency doubling laser.
  • the third coreless fiber 1406, the second Grin fiber 1407, and the fourth coreless fiber 1408 are equivalent to a spatial focusing lens and a free space before and after it, which utilizes a self-focusing principle to collimate a 0.5 ⁇ m double-frequency laser and Focusing into the core of the laser frequency multiplier output fiber 1409.
  • the third coreless fiber 1406 is used for beam expanding transmission of the green frequency doubled laser generated by the frequency doubling crystal 1405 to achieve a relatively large spot diameter when entering the second Grin fiber 1407.
  • the second Grin fiber 1407 is used for collimating and focusing the green frequency doubled laser input after the third coreless fiber 1406 is expanded and transmitted.
  • the fourth coreless fiber 1408 is used for focusing transmission of the double-frequency laser that is collimated and focused by the second Grin fiber 1407, and enters the laser frequency multiplier output fiber 1409.
  • the laser frequency multiplier output fiber 1409 is for outputting a green frequency doubled laser input after being focused and transmitted via the fourth coreless fiber 1408 as pump light for pumping the photonic crystal fiber 2.
  • the all-fiber laser frequency multiplier 14 includes a laser multiplier input fiber 1401, a second fiber end cap 1410, and a first laser collimator lens 1411, which are sequentially connected.
  • the laser frequency multiplier input fiber 1401 is configured to receive the fundamental frequency light output by the polarization dependent fiber isolator 12.
  • the second fiber end cap 1410 is used for expanding and transmitting the fundamental light input through the laser frequency multiplier input fiber 1401, thereby avoiding damage of the output end face by the high power laser, and avoiding the fundamental frequency light being reflected back to the front stage through the end face.
  • the system causes damage to the front-end system.
  • the first laser collimating lens 1411 is for collimating the fundamental light input after the second fiber end cap 1410 is expanded and transmitted.
  • the first laser focusing lens 1412 is for focusing the fundamental light that has been collimated by the first laser collimating lens 1411 to focus at the center of the frequency doubling crystal 1405 to become a minimum waist spot.
  • the frequency doubling crystal 1405 is used to multiply the fundamental light that has been focused by the first laser focusing lens 1412 to generate a green frequency doubling laser.
  • the second laser collimating lens 1413 is for collimating the green frequency doubled laser generated by the frequency doubling crystal 1405.
  • the second laser focusing lens 1414 is for focusing the green double-frequency laser that is collimated by the second laser collimating lens 1413.
  • the third fiber end cap 1415 is used to avoid reflection of the end face to cause damage to the front stage system, and the focused green frequency doubled laser enters the laser frequency multiplier output fiber 1409.
  • the laser frequency multiplier output fiber 1409 is for outputting a green frequency doubled laser input through the third fiber end cap 1415 as pump light for pumping the photonic crystal fiber 2.
  • the all-fiber laser frequency multiplier 14 further includes a fixing member 1416 for fixing the second fiber end cap 1410, the first laser collimating lens 1411, the first laser focusing lens 1412, the frequency doubled crystal 1405, A second laser collimating lens 1413, a second laser focusing lens 1414, and a third fiber end cap 1415.
  • the output of the polarization-dependent fiber optic isolator 12 is coupled to a laser frequency multiplier input fiber 1401, and the laser multiplier output fiber 1409 is coupled to the photonic crystal fiber 2.
  • the laser frequency multiplier input fiber 1401 is a polarization-maintaining fiber having the same fiber parameters as the input end and the output end of the optical fiber and the polarization-dependent optical fiber isolator 12 at the output end of the linear polarization narrow linewidth fiber laser 11.
  • the laser frequency multiplier output fiber 1409 is a single mode polarization maintaining fiber having a cutoff wavelength of less than 0.5 ⁇ m.
  • the photonic crystal fiber 2 may be a non-tapered quartz photonic crystal fiber or a tapered quartz photonic crystal fiber.
  • the zero-dispersion wavelength of the non-tapered quartz photonic crystal fiber is in the near-infrared band.
  • the zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser 1.
  • the linearly polarized narrow linewidth fiber laser 11 is an ultrashort pulse fiber laser with a pulse width of not more than 10 picoseconds
  • the photonic crystal fiber 2 can be a non-tapered quartz photonic crystal fiber, which is mainly based on the self-phase modulation nonlinear optical effect.
  • Visible light supercontinuum can also use tapered quartz photonic crystal fiber to produce visible light supercontinuum based on nonlinear optical effects such as modulation instability, cross-phase modulation, four-wave mixing, soliton self-frequency shift, soliton capture .
  • the linearly polarized narrow linewidth fiber laser 11 uses a long pulse fiber laser or a continuous wave fiber laser with a pulse width greater than 10 picoseconds
  • the photonic crystal fiber needs to adopt a tapered quartz photonic crystal fiber, which is mainly based on modulation instability and soliton self. Visible light supercontinuum of nonlinear optical effects such as frequency shifting and soliton trapping.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
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  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

A visible light super-continuum spectrum light source based on green-light fiber laser pumping. All-fiber green-light fiber laser (1) based on the Grin fiber coupling technique or a space coupling external member is used to pump photon crystal fibers (2), to generate a super-continuum spectrum light source with spectral energy mainly concentrated on the visible light wave band. Therefore, a high-power all-fiber super-continuum spectrum light source with merely the visible light wave band can be realized, and the requirement of the application field of the visible light super-continuum spectrum can be better satisfied.

Description

一种基于绿光光纤激光器泵浦的可见光超连续谱光源  A visible light supercontinuum source based on green fiber laser pumping 技术领域Technical field
本发明涉及光纤技术领域，尤其涉及一种基于绿光光纤激光器泵浦的可见光超连续谱光源。 The present invention relates to the field of optical fiber technologies, and in particular, to a visible light supercontinuum source light source based on green light fiber laser pumping.
背景技术Background technique
光纤超连续谱光源可产生高亮度、高相干的宽带光，相当于宽带激光器，在生物医学、激光光谱学、环境监测、遥感探测等领域具有重要的应用前景,特别是可见光波段的超连续谱在细胞学、生物医学成像、生物光谱分析等领域具有无可替代的应用价值。然而，当前产生超连续谱的主流技术是利用成熟的 1 μm 、1.5 μm或2 μm光纤激光泵浦而实现，导致输出超连续谱中大部分能量集中于 800 nm 以上的红外波段，到纯可见光波段的能量转化效率很低。如著名的超连续谱光源供应商英国 Fianium 公司的 10 W 超连续谱光源，在可见光波段仅有 1.2 W 的功率。另一家知名超连续谱供应商丹麦 NKT 公司开发了可见光增强的超连续谱光源，提高了可见光波段的转化效率，但即便如此，输出功率为 8 W 超连续谱光源在可见光波段也仅有 2 W 的输出功率，而且还需要使用其内配的光谱分束器才可以将可见光波段光谱分离输出。常规超连续谱光源在可见光波段如此低的转化效率和功率利用率，极大地限制了可见光超连续谱的应用。 Fiber supercontinuum source can produce high-brightness and high-coherence broadband light, which is equivalent to broadband laser. It has important application prospects in biomedicine, laser spectroscopy, environmental monitoring, remote sensing and other fields, especially super-continuous spectrum in visible light. It has irreplaceable application value in the fields of cytology, biomedical imaging, and biospectral analysis. However, the current mainstream technology for generating supercontinuum is to take advantage of the mature Realized by 1 μm, 1.5 μm or 2 μm fiber laser pumping, causing most of the energy in the output supercontinuum to concentrate at 800 nm In the above infrared band, the energy conversion efficiency to the pure visible light band is very low. For example, the well-known supercontinuum source supplier, Fianium, UK, has a 10 W supercontinuum source with only 1.2 W in the visible range. Power. Another well-known supercontinuum supplier, NKT, Denmark, has developed a visible-enhanced supercontinuum source that improves conversion efficiency in the visible range, but even so, the output is 8 W. Supercontinuum source is only 2 W in the visible range The output power, but also the use of the spectral beam splitter in it can be used to separate the visible spectrum spectrum output. The low conversion efficiency and power utilization of conventional supercontinuum sources in the visible range greatly limits the application of visible light supercontinuum.
技术问题technical problem
本发明所要解决的技术问题是：针对现有技术中超连续谱光源光谱能量在可见光波段所占比例过低，从而限制了可见光超连续谱的应用的不足，本发明拟提供一种基于绿光光纤激光器泵浦的可见光超连续谱光源，使光谱能量主要集中于可见光波段。 The technical problem to be solved by the present invention is that the spectral energy of the supercontinuum source in the prior art is too low in the visible light band, thereby limiting the application of the visible light supercontinuum. The present invention is intended to provide a green optical fiber. Laser-pumped visible light supercontinuum sources allow spectral energy to be concentrated in the visible range.
技术解决方案Technical solution
本发明是这样实现的： 一种基于绿光光纤激光器泵浦的可见光超连续谱光源，包括依次连接的绿光光纤激光器、光子晶体光纤、第一光纤端帽；The present invention is implemented as follows: A visible light supercontinuum source light sourced by a green light fiber laser pump, comprising a green light fiber laser, a photonic crystal fiber, and a first fiber end cap connected in sequence;
所述绿光光纤激光器用于产生绿色激光，作为泵浦所述光子晶体光纤从而使所述光子晶体光纤输出超连续谱的泵浦光；The green fiber laser is used to generate a green laser as a pumping light of the photonic crystal fiber to output a supercontinuum spectrum of the photonic crystal fiber;
所述第一光纤端帽用于避免所述光子晶体光纤的端面反射；The first fiber end cap is configured to avoid end surface reflection of the photonic crystal fiber;
所述绿光光纤激光器包括依次连接的：The green fiber laser includes sequential connections:
线偏振窄线宽光纤激光器，用于产生基频光；a linearly polarized narrow linewidth fiber laser for generating fundamental light;
偏振相关型光纤隔离器，用于防止所述基频光反馈回所述线偏振窄线宽光纤激光器；a polarization-dependent fiber optic isolator for preventing the fundamental frequency light from being fed back to the linearly polarized narrow linewidth fiber laser;
全光纤激光倍频器，用于对所述偏振相关型光纤隔离器输出的基频光进行倍频，产生绿色倍频激光；An all-fiber laser frequency multiplier for multiplying a fundamental frequency light output by the polarization-dependent optical fiber isolator to generate a green frequency doubled laser;
所述全光纤激光倍频器为如下两种结构中的任意一种：The all-fiber laser frequency multiplier is any one of the following two structures:
结构1：所述全光纤激光倍频器包括依次连接的：Structure 1: The all-fiber laser frequency multiplier includes sequential connections:
激光倍频器输入光纤，用于接收所述偏振相关型光纤隔离器输出的基频光；a laser frequency multiplier input fiber for receiving a fundamental frequency light output by the polarization dependent fiber isolator;
第一无芯光纤，用于对经所述激光倍频器输入光纤输入的基频光进行扩束传输；a first coreless optical fiber for performing beam expansion and transmission on a fundamental light input through the input end of the laser frequency multiplier input fiber;
第一Grin光纤，用于对经所述第一无芯光纤扩束传输后输入的基频光进行准直及聚焦；a first Grin fiber for collimating and focusing the fundamental light input after the first coreless fiber is expanded and transmitted;
第二无芯光纤，用于对经所述第一Grin光纤准直及聚焦后的基频光进行聚焦传输；a second coreless optical fiber for performing focus transmission on the collimated and focused fundamental frequency light of the first Grin optical fiber;
倍频晶体，用于对经所述第二无芯光纤聚焦传输后输入的基频光进行倍频，产生绿色倍频激光；a frequency doubling crystal for multiplying a fundamental frequency light input after being focused and transmitted by the second coreless fiber to generate a green frequency doubled laser;
第三无芯光纤，用于对所述倍频晶体产生的绿色倍频激光进行扩束传输；a third coreless fiber for performing beam expansion transmission on the green frequency doubled laser generated by the frequency doubling crystal;
第二Grin光纤，用于对经所述第三无芯光纤扩束传输后输入的绿色倍频激光进行准直及聚焦；a second Grin fiber for collimating and focusing the green frequency doubled laser input after the third coreless fiber is expanded and transmitted;
第四无芯光纤，用于对经所述第二Grin光纤准直及聚焦后的绿色倍频激光进行聚焦传输；a fourth coreless optical fiber, configured to perform focus transmission on the green double-frequency laser that is collimated and focused by the second Grin fiber;
激光倍频器输出光纤，用于输出经所述第四无芯光纤聚焦传输后输入的绿色倍频激光，作为泵浦所述光子晶体光纤的泵浦光；a laser frequency multiplier output fiber for outputting a green frequency doubled laser input after being focused and transmitted by the fourth coreless fiber, as pumping light for pumping the photonic crystal fiber;
结构2：所述全光纤激光倍频器包括依次连接的：Structure 2: The all-fiber laser frequency multiplier includes sequential connections:
激光倍频器输入光纤，用于接收所述偏振相关型光纤隔离器输出的基频光；a laser frequency multiplier input fiber for receiving a fundamental frequency light output by the polarization dependent fiber isolator;
第二光纤端帽，用于对经所述激光倍频器输入光纤输入的基频光进行扩束传输，并避免端面反射；a second fiber end cap for expanding and transmitting the fundamental light input through the input fiber of the laser frequency multiplier, and avoiding end surface reflection;
第一激光准直透镜，用于对经所述第二光纤端帽扩束传输后输入的基频光进行准直；a first laser collimating lens for collimating the fundamental light input after the second fiber end cap is expanded and transmitted;
第一激光聚焦透镜，用于对经所述第一激光准直透镜准直后的基频光进行聚焦；a first laser focusing lens for focusing a fundamental light that is collimated by the first laser collimating lens;
倍频晶体，用于对经所述第一激光聚焦透镜聚焦后的基频光进行倍频，产生绿色倍频激光；a frequency doubling crystal for multiplying a fundamental frequency light that is focused by the first laser focusing lens to generate a green frequency doubling laser;
第二激光准直透镜，用于对所述倍频晶体产生的绿色倍频激光进行准直；a second laser collimating lens for collimating the green frequency doubled laser generated by the frequency doubling crystal;
第二激光聚焦透镜，用于对经所述第二激光准直透镜准直后的绿色倍频激光进行聚焦；a second laser focusing lens for focusing a green double-frequency laser that is collimated by the second laser collimating lens;
第三光纤端帽，用于避免端面反射，并输出经所述第二激光聚焦透镜聚焦后的绿色倍频激光；a third fiber end cap for avoiding end surface reflection and outputting a green frequency doubled laser focused by the second laser focusing lens;
激光倍频器输出光纤，用于输出经所述第三光纤端帽输入的绿色倍频激光；a laser frequency multiplier output fiber for outputting a green frequency doubled laser input through the third fiber end cap;
上述两种结构中：In the above two structures:
所述偏振相关型光纤隔离器的输出端与所述激光倍频器输入光纤连接；An output end of the polarization dependent fiber optic isolator is coupled to the laser frequency multiplier input fiber;
所述激光倍频器输出光纤与所述光子晶体光纤连接。The laser frequency multiplier output fiber is coupled to the photonic crystal fiber.
进一步地，所述激光倍频器输出光纤为截止波长低于0.5μm的单模保偏光纤。Further, the laser frequency multiplier output fiber is a single mode polarization maintaining fiber with a cutoff wavelength of less than 0.5 μm.
进一步地，所述线偏振窄线宽光纤激光器的脉宽不大于10皮秒；Further, the linear polarization narrow linewidth fiber laser has a pulse width of no more than 10 picoseconds;
所述光子晶体光纤为非锥形石英光子晶体光纤或锥形石英光子晶体光纤；The photonic crystal fiber is a non-tapered quartz photonic crystal fiber or a tapered quartz photonic crystal fiber;
所述非锥形石英光子晶体光纤的零色散波长位于近红外波段；The zero-dispersion wavelength of the non-tapered quartz photonic crystal fiber is located in the near-infrared band;
所述锥形石英光子晶体光纤的零色散波长在其锥形过渡区中从近红外波段逐渐降低到绿光波段，接近但小于所述绿光光纤激光器的输出波长。The zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser.
进一步地，所述线偏振窄线宽光纤激光器的脉宽大于10皮秒；Further, the linear polarization narrow linewidth fiber laser has a pulse width greater than 10 picoseconds;
所述光子晶体光纤为锥形石英光子晶体光纤；The photonic crystal fiber is a tapered quartz photonic crystal fiber;
所述锥形石英光子晶体光纤的零色散波长在其锥形过渡区中从近红外波段逐渐降低到绿光波段，接近但小于所述绿光光纤激光器的输出波长。The zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser.
进一步地，所述线偏振窄线宽光纤激光器为工作波长为1 μm的掺Yb光纤激光器。Further, the linearly polarized narrow linewidth fiber laser is a Yb-doped fiber laser having a working wavelength of 1 μm.
进一步地，所述线偏振窄线宽光纤激光器的输出端的光纤、所述偏振相关型光纤隔离器的输入端及输出端的光纤及所述激光倍频器输入光纤为参数相同的保偏光纤。Further, the optical fiber at the output end of the linear polarization narrow linewidth fiber laser, the optical fiber at the input end and the output end of the polarization dependent fiber isolator, and the input fiber of the laser frequency multiplier are the polarization maintaining fibers having the same parameters.
有益效果Beneficial effect
与现有技术相比，本发明通过全光纤化的绿光光纤激光器产生泵浦光，通过Grin 光纤耦合技术或透镜耦合技术，使超连续谱光源的光谱能量主要集中于可见光波段，可使激光器在当前功率条件输出的超连续谱光源在可见光波段的功率大大提高，从而可以实现更广泛的可见光超连续谱应用。Compared with the prior art, the present invention generates pump light through a fully opticalized green fiber laser, through Grin The fiber coupling technology or the lens coupling technology makes the spectral energy of the supercontinuum source mainly concentrated in the visible light band, which can greatly increase the power of the supercontinuum source in the visible light band of the current power condition, so that a wider range of visible light can be realized. Supercontinuum applications.
附图说明DRAWINGS
图1：本发明实施例1提供的基于绿光光纤激光器泵浦的可见光超连续谱光源的结构示意图；1 is a schematic structural view of a visible light supercontinuum source based on a green fiber laser pump according to Embodiment 1 of the present invention;
图2：本发明实施例2提供的另一种基于绿光光纤激光器泵浦的可见光超连续谱光源的结构示意图。2 is a schematic structural view of another visible light supercontinuum light source pumped by a green light fiber laser according to Embodiment 2 of the present invention.
本发明的实施方式Embodiments of the invention
为了使本发明的目的、技术方案及优点更加清楚明白，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用于解释本发明，并不用于限定本发明。The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
图1及图2示出了两种结构的基于绿光光纤激光器泵浦的可见光超连续谱光源（以下简称光源）的结构。根据图1及图2所示，两种结构的光源均包括依次连接的绿光光纤激光器1、光子晶体光纤2及第一光纤端帽3。其中，绿光光纤激光器1用于产生绿光，作为泵浦光子晶体光纤2的泵浦光。第一光纤端帽3用于避免光子晶体光纤2的端面反射，使通过光子晶体光纤2输出的激光不会因其端面的反射而反射回绿光光纤激光器1中，从而保护绿光光纤激光器1免受损伤。1 and 2 show the structure of a visible light supercontinuum source (hereinafter referred to as a light source) based on green light fiber laser pumping of two structures. According to FIG. 1 and FIG. 2, the light sources of the two structures each include a green fiber laser 1, a photonic crystal fiber 2, and a first fiber end cap 3 which are sequentially connected. Among them, the green fiber laser 1 is used to generate green light as pump light for pumping the photonic crystal fiber 2. The first fiber end cap 3 is used to prevent the end face reflection of the photonic crystal fiber 2, so that the laser light output through the photonic crystal fiber 2 is not reflected back to the green fiber laser 1 due to the reflection of the end face thereof, thereby protecting the green fiber laser 1 Free from damage.
上述结构中，绿光光纤激光器1包括依次连接的线偏振窄线宽光纤激光器11、偏振相关型光纤隔离器12、全光纤激光倍频器14。其中，线偏振窄线宽光纤激光器11用于产生基频光。偏振相关型光纤隔离器12用于确保产生的基频光单向传输，防止其反馈回线偏振窄线宽光纤激光器1中对系统造成损伤。全光纤激光倍频器14用于对偏振相关型光纤隔离器12输出的基频光进行倍频，从而产生上述绿光。In the above structure, the green fiber laser 1 includes a linearly polarized narrow linewidth fiber laser 11, a polarization dependent fiber isolator 12, and an all-fiber laser frequency multiplier 14 which are sequentially connected. Among them, the linearly polarized narrow linewidth fiber laser 11 is used to generate fundamental light. The polarization-dependent fiber optic isolator 12 is used to ensure that the generated fundamental frequency light is transmitted unidirectionally, preventing damage to the system caused by the feedback back-line polarization narrow linewidth fiber laser 1. The all-fiber laser frequency multiplier 14 is used to multiply the fundamental light output from the polarization-dependent optical fiber isolator 12 to generate the above-mentioned green light.
根据绿光的波长范围，本实施例中，线偏振窄线宽光纤激光器优选采用工作波长在1μm波段的掺Yb光纤激光器，掺Yb光纤激光器具有增益带宽,可调谐范围宽，能获得高增益和高能量转换效率，其输出1μm线偏振窄线宽激光作为基频光。该基频光经偏振相关型光纤隔离器12进入全光纤激光倍频器14中倍频，从而获得波长为0.5μm的绿光。线偏振窄线宽光纤激光器11的输出端的光纤、偏振相关型光纤隔离器12的输入端及输出端的光纤为参数相同的保偏光纤。According to the wavelength range of the green light, in the present embodiment, the linearly polarized narrow linewidth fiber laser preferably uses a Yb-doped fiber laser with a working wavelength of 1 μm. The Yb-doped fiber laser has a gain bandwidth, a wide tunable range, and high gain and High energy conversion efficiency, which outputs a 1 μm linearly polarized narrow linewidth laser as the fundamental light. The fundamental frequency light is multiplied into the all-fiber laser frequency multiplier 14 via the polarization-dependent optical fiber isolator 12 to obtain green light having a wavelength of 0.5 μm. The fiber at the output end of the linearly polarized narrow linewidth fiber laser 11 and the input end and the output end of the polarization dependent fiber isolator 12 are polarization-maintaining fibers having the same parameters.
上述两种结构的光源的不同点在于，全光纤激光倍频器14的结构不同。The light sources of the above two structures are different in that the structure of the all-fiber laser frequency multiplier 14 is different.
如图1所示，其中一种结构的光源中，全光纤激光倍频器14包括依次连接的激光倍频器输入光纤1401、第一无芯光纤1402、第一Grin光纤1403、第二无芯光纤1404、倍频晶体1405、第三无芯光纤1406、第二Grin光纤1407、第四无芯光纤1408、激光倍频器输出光纤1409。其中，激光倍频器输入光纤1401用于接收偏振相关型光纤隔离器12输出的基频光。激光倍频器输入光纤1401、第一无芯光纤1402及第一Grin光纤1403三者的结合相当于空间聚焦透镜及其前后的自由空间，其利用自聚焦原理将基频光准直及聚焦到倍频晶体1405中心。具体而言，第一无芯光纤1402用于对经激光倍频器输入光纤1401输入的基频光进行扩束传输，使其进入第一Grin光纤1403时达到比较大的光斑直径。所谓的扩束传输是指：第一无芯光纤1402相当于空间聚焦透镜前的自由空间，激光倍频器输入光纤1401接收到的基频光进入第一无芯光纤1402后，在第一无芯光纤1402中传输，传输过程中，基频光的光束逐渐发散，从而起到扩束作用。第一无芯光纤1402的长度可根据实际需要计算得出。基频光经第一无芯光纤1402扩束传输后，进入第一Grin光纤1403。第一Grin光纤1403用于对经第一无芯光纤1402扩束传输后输入的基频光进行准直及聚焦。第二无芯光纤1404用于对经第一Grin光纤1403准直及聚焦后的基频光进行聚焦传输，使其在倍频晶体1405的中心处聚焦成为最小腰斑。所谓聚焦传输是指：第二无芯光纤1404相当于空间聚焦透镜后的自由空间。第一Grin光纤1403准直及聚焦后的基频光进入第二无芯光纤1404后，在第二无芯光纤1404中传输，在传输过程中，基频光的光束逐渐收拢，从而起到聚焦的作用。第二无芯光纤1404的长度可根据实际需要计算得出。基频光经第二无芯光纤1404聚焦传输后，进入倍频晶体1405。倍频晶体1405用于对经第二无芯光纤1404聚焦传输后输入的基频光进行倍频从而产生绿色倍频激光。与前述同理，第三无芯光纤1406、第二Grin光纤1407及第四无芯光纤1408相当于空间聚焦透镜及其前后的自由空间，其利用自聚焦原理将0.5μm倍频激光准直及聚焦进入激光倍频器输出光纤1409的纤芯中。具体而言，第三无芯光纤1406用于对倍频晶体1405产生的绿色倍频激光进行扩束传输，使其进入第二Grin光纤1407时达到比较大的光斑直径。第二Grin光纤1407用于对经第三无芯光纤1406扩束传输后输入的绿色倍频激光进行准直及聚焦。第四无芯光纤1408用于对经第二Grin光纤1407准直及聚焦后的倍频激光进行聚焦传输，并进入激光倍频器输出光纤1409。激光倍频器输出光纤1409用于输出经第四无芯光纤1408聚焦传输后输入的绿色倍频激光，作为泵浦光子晶体光纤2的泵浦光。As shown in FIG. 1, in the light source of one structure, the all-fiber laser frequency multiplier 14 includes a laser multiplier input fiber 1401, a first coreless fiber 1402, a first Grin fiber 1403, and a second corelessly connected in sequence. Optical fiber 1404, frequency doubled crystal 1405, third coreless optical fiber 1406, second Grin optical fiber 1407, fourth coreless optical fiber 1408, and laser multiplier output optical fiber 1409. The laser frequency multiplier input fiber 1401 is configured to receive the fundamental frequency light output by the polarization dependent fiber isolator 12. The combination of the laser frequency multiplier input fiber 1401, the first coreless fiber 1402 and the first Grin fiber 1403 is equivalent to a spatial focusing lens and a free space before and after it, which uses the principle of self-focusing to collimate and focus the fundamental light to Frequency doubling crystal 1405 center. Specifically, the first coreless fiber 1402 is used for beam expanding transmission of the fundamental frequency light input through the laser frequency multiplier input fiber 1401 to achieve a relatively large spot diameter when entering the first Grin fiber 1403. The so-called beam expansion transmission means that the first coreless fiber 1402 is equivalent to the free space in front of the spatial focusing lens, and the fundamental frequency light received by the laser frequency multiplier input fiber 1401 enters the first coreless fiber 1402, and is in the first In the core fiber 1402, during transmission, the beam of the fundamental light gradually diverges, thereby expanding the beam. The length of the first coreless fiber 1402 can be calculated according to actual needs. After the baseband light is expanded and transmitted through the first coreless fiber 1402, it enters the first Grin fiber 1403. The first Grin fiber 1403 is used for collimating and focusing the fundamental light input after the first coreless fiber 1402 is expanded and transmitted. The second coreless fiber 1404 is used for focusing transmission of the collimated and focused fundamental light transmitted through the first Grin fiber 1403 so as to be focused at the center of the frequency doubling crystal 1405 as a minimum waist spot. The so-called focus transmission means that the second coreless fiber 1404 corresponds to a free space after the spatial focusing lens. After the first Grin fiber 1403 collimates and the focused baseband light enters the second coreless fiber 1404, it is transmitted in the second coreless fiber 1404. During the transmission process, the fundamental light beam gradually gathers, thereby focusing. The role. The length of the second coreless fiber 1404 can be calculated according to actual needs. After the fundamental light is focused and transmitted through the second coreless fiber 1404, it enters the frequency doubling crystal 1405. The frequency doubling crystal 1405 is used to multiply the fundamental frequency light input after the second coreless fiber 1404 is focused and transmitted to generate a green frequency doubling laser. Similarly, the third coreless fiber 1406, the second Grin fiber 1407, and the fourth coreless fiber 1408 are equivalent to a spatial focusing lens and a free space before and after it, which utilizes a self-focusing principle to collimate a 0.5 μm double-frequency laser and Focusing into the core of the laser frequency multiplier output fiber 1409. Specifically, the third coreless fiber 1406 is used for beam expanding transmission of the green frequency doubled laser generated by the frequency doubling crystal 1405 to achieve a relatively large spot diameter when entering the second Grin fiber 1407. The second Grin fiber 1407 is used for collimating and focusing the green frequency doubled laser input after the third coreless fiber 1406 is expanded and transmitted. The fourth coreless fiber 1408 is used for focusing transmission of the double-frequency laser that is collimated and focused by the second Grin fiber 1407, and enters the laser frequency multiplier output fiber 1409. The laser frequency multiplier output fiber 1409 is for outputting a green frequency doubled laser input after being focused and transmitted via the fourth coreless fiber 1408 as pump light for pumping the photonic crystal fiber 2.
如图2所示，另一种结构的光源中，全光纤激光倍频器14包括依次连接的激光倍频器输入光纤1401、第二光纤端帽1410、第一激光准直透镜1411、第一激光聚焦透镜1412、倍频晶体1405、第二激光准直透镜1413、第二激光聚焦透镜1414、第三光纤端帽1415、激光倍频器输出光纤1409。其中，激光倍频器输入光纤1401用于接收偏振相关型光纤隔离器12输出的基频光。第二光纤端帽1410用于对经激光倍频器输入光纤1401输入的基频光进行扩束传输，避免高功率激光对输出端面的损伤，同时，避免基频光经端面反射回其前级系统，对前级系统造成损伤。第一激光准直透镜1411用于对经第二光纤端帽1410扩束传输后输入的基频光进行准直。第一激光聚焦透镜1412用于对经第一激光准直透镜1411准直后的基频光进行聚焦，使其在倍频晶体1405的中心处聚焦成为最小腰斑。倍频晶体1405用于对经第一激光聚焦透镜1412聚焦后的基频光进行倍频，产生绿色倍频激光。第二激光准直透镜1413用于对倍频晶体1405产生的绿色倍频激光进行准直。第二激光聚焦透镜1414用于对经第二激光准直透镜1413准直后的绿色倍频激光进行聚焦。第三光纤端帽1415用于避免端面反射从而对其前级系统造成损伤，聚焦后的绿色倍频激光进入激光倍频器输出光纤1409。激光倍频器输出光纤1409用于输出经第三光纤端帽1415输入的绿色倍频激光，作为泵浦光子晶体光纤2的泵浦光。在该种结构中，全光纤激光倍频器14还包括一固定件1416，用于固定第二光纤端帽1410、第一激光准直透镜1411、第一激光聚焦透镜1412、倍频晶体1405、第二激光准直透镜1413、第二激光聚焦透镜1414及第三光纤端帽1415。As shown in FIG. 2, in the light source of another structure, the all-fiber laser frequency multiplier 14 includes a laser multiplier input fiber 1401, a second fiber end cap 1410, and a first laser collimator lens 1411, which are sequentially connected. A laser focusing lens 1412, a frequency doubling crystal 1405, a second laser collimating lens 1413, a second laser focusing lens 1414, a third fiber end cap 1415, and a laser frequency multiplier output fiber 1409. The laser frequency multiplier input fiber 1401 is configured to receive the fundamental frequency light output by the polarization dependent fiber isolator 12. The second fiber end cap 1410 is used for expanding and transmitting the fundamental light input through the laser frequency multiplier input fiber 1401, thereby avoiding damage of the output end face by the high power laser, and avoiding the fundamental frequency light being reflected back to the front stage through the end face. The system causes damage to the front-end system. The first laser collimating lens 1411 is for collimating the fundamental light input after the second fiber end cap 1410 is expanded and transmitted. The first laser focusing lens 1412 is for focusing the fundamental light that has been collimated by the first laser collimating lens 1411 to focus at the center of the frequency doubling crystal 1405 to become a minimum waist spot. The frequency doubling crystal 1405 is used to multiply the fundamental light that has been focused by the first laser focusing lens 1412 to generate a green frequency doubling laser. The second laser collimating lens 1413 is for collimating the green frequency doubled laser generated by the frequency doubling crystal 1405. The second laser focusing lens 1414 is for focusing the green double-frequency laser that is collimated by the second laser collimating lens 1413. The third fiber end cap 1415 is used to avoid reflection of the end face to cause damage to the front stage system, and the focused green frequency doubled laser enters the laser frequency multiplier output fiber 1409. The laser frequency multiplier output fiber 1409 is for outputting a green frequency doubled laser input through the third fiber end cap 1415 as pump light for pumping the photonic crystal fiber 2. In this configuration, the all-fiber laser frequency multiplier 14 further includes a fixing member 1416 for fixing the second fiber end cap 1410, the first laser collimating lens 1411, the first laser focusing lens 1412, the frequency doubled crystal 1405, A second laser collimating lens 1413, a second laser focusing lens 1414, and a third fiber end cap 1415.
以上两种结构的光源中，激光的光路如虚线所示。偏振相关型光纤隔离器12的输出端与激光倍频器输入光纤1401连接，激光倍频器输出光纤1409与光子晶体光纤2连接。激光倍频器输入光纤1401为与线偏振窄线宽光纤激光器11的输出端的光纤及偏振相关型光纤隔离器12的输入端及输出端的光纤参数相同的保偏光纤。激光倍频器输出光纤1409为截止波长低于0.5μm的单模保偏光纤。In the light sources of the above two structures, the optical path of the laser is indicated by a broken line. The output of the polarization-dependent fiber optic isolator 12 is coupled to a laser frequency multiplier input fiber 1401, and the laser multiplier output fiber 1409 is coupled to the photonic crystal fiber 2. The laser frequency multiplier input fiber 1401 is a polarization-maintaining fiber having the same fiber parameters as the input end and the output end of the optical fiber and the polarization-dependent optical fiber isolator 12 at the output end of the linear polarization narrow linewidth fiber laser 11. The laser frequency multiplier output fiber 1409 is a single mode polarization maintaining fiber having a cutoff wavelength of less than 0.5 μm.
光子晶体光纤2可采用非锥形石英光子晶体光纤或锥形石英光子晶体光纤。非锥形石英光子晶体光纤的零色散波长位于近红外波段。锥形石英光子晶体光纤的零色散波长在其锥形过渡区中从近红外波段逐渐降低到绿光波段，接近但小于绿光光纤激光器1的输出波长。如果线偏振窄线宽光纤激光器11选用脉宽不大于10皮秒的超短脉冲光纤激光器，光子晶体光纤2既可以采用非锥形石英光子晶体光纤，产生主要基于自相位调制非线性光学效应的可见光超连续谱，可也以采用锥形石英光子晶体光纤，产生主要基于调制不稳定性、交叉相位调制、四波混频、孤子自频移、孤子捕获等非线性光学效应的可见光超连续谱。如果线偏振窄线宽光纤激光器11选用脉宽大于10皮秒的长脉冲光纤激光器或连续波光纤激光器，光子晶体光纤则需采用锥形石英光子晶体光纤，产生主要基于调制不稳定性、孤子自频移、孤子捕获等非线性光学效应的可见光超连续谱。The photonic crystal fiber 2 may be a non-tapered quartz photonic crystal fiber or a tapered quartz photonic crystal fiber. The zero-dispersion wavelength of the non-tapered quartz photonic crystal fiber is in the near-infrared band. The zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser 1. If the linearly polarized narrow linewidth fiber laser 11 is an ultrashort pulse fiber laser with a pulse width of not more than 10 picoseconds, the photonic crystal fiber 2 can be a non-tapered quartz photonic crystal fiber, which is mainly based on the self-phase modulation nonlinear optical effect. Visible light supercontinuum, can also use tapered quartz photonic crystal fiber to produce visible light supercontinuum based on nonlinear optical effects such as modulation instability, cross-phase modulation, four-wave mixing, soliton self-frequency shift, soliton capture . If the linearly polarized narrow linewidth fiber laser 11 uses a long pulse fiber laser or a continuous wave fiber laser with a pulse width greater than 10 picoseconds, the photonic crystal fiber needs to adopt a tapered quartz photonic crystal fiber, which is mainly based on modulation instability and soliton self. Visible light supercontinuum of nonlinear optical effects such as frequency shifting and soliton trapping.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims (6)

  1. 一种基于绿光光纤激光器泵浦的可见光超连续谱光源，其特征在于，包括依次连接的绿光光纤激光器、光子晶体光纤、第一光纤端帽； A visible light supercontinuum source light source based on green light fiber laser pumping, comprising: a green light fiber laser, a photonic crystal fiber, and a first fiber end cap connected in sequence;
    所述绿光光纤激光器用于产生绿色激光，作为泵浦所述光子晶体光纤从而使所述光子晶体光纤输出超连续谱的泵浦光；The green fiber laser is used to generate a green laser as a pumping light of the photonic crystal fiber to output a supercontinuum spectrum of the photonic crystal fiber;
    所述第一光纤端帽用于避免所述光子晶体光纤的端面反射；The first fiber end cap is configured to avoid end surface reflection of the photonic crystal fiber;
    所述绿光光纤激光器包括依次连接的：The green fiber laser includes sequential connections:
    线偏振窄线宽光纤激光器，用于产生基频光；a linearly polarized narrow linewidth fiber laser for generating fundamental light;
    偏振相关型光纤隔离器，用于防止所述基频光反馈回所述线偏振窄线宽光纤激光器；a polarization-dependent fiber optic isolator for preventing the fundamental frequency light from being fed back to the linearly polarized narrow linewidth fiber laser;
    全光纤激光倍频器，用于对所述偏振相关型光纤隔离器输出的基频光进行倍频，产生绿色倍频激光；An all-fiber laser frequency multiplier for multiplying a fundamental frequency light output by the polarization-dependent optical fiber isolator to generate a green frequency doubled laser;
    所述全光纤激光倍频器为如下两种结构中的任意一种：The all-fiber laser frequency multiplier is any one of the following two structures:
    结构1：所述全光纤激光倍频器包括依次连接的：Structure 1: The all-fiber laser frequency multiplier includes sequential connections:
    激光倍频器输入光纤，用于接收所述偏振相关型光纤隔离器输出的基频光；a laser frequency multiplier input fiber for receiving a fundamental frequency light output by the polarization dependent fiber isolator;
    第一无芯光纤，用于对经所述激光倍频器输入光纤输入的基频光进行扩束传输；a first coreless optical fiber for performing beam expansion and transmission on a fundamental light input through the input end of the laser frequency multiplier input fiber;
    第一Grin光纤，用于对经所述第一无芯光纤扩束传输后输入的基频光进行准直及聚焦；a first Grin fiber for collimating and focusing the fundamental light input after the first coreless fiber is expanded and transmitted;
    第二无芯光纤，用于对经所述第一Grin光纤准直及聚焦后的基频光进行聚焦传输；a second coreless optical fiber for performing focus transmission on the collimated and focused fundamental frequency light of the first Grin optical fiber;
    倍频晶体，用于对经所述第二无芯光纤聚焦传输后输入的基频光进行倍频，产生绿色倍频激光；a frequency doubling crystal for multiplying a fundamental frequency light input after being focused and transmitted by the second coreless fiber to generate a green frequency doubled laser;
    第三无芯光纤，用于对所述倍频晶体产生的绿色倍频激光进行扩束传输；a third coreless fiber for performing beam expansion transmission on the green frequency doubled laser generated by the frequency doubling crystal;
    第二Grin光纤，用于对经所述第三无芯光纤扩束传输后输入的绿色倍频激光进行准直及聚焦；a second Grin fiber for collimating and focusing the green frequency doubled laser input after the third coreless fiber is expanded and transmitted;
    第四无芯光纤，用于对经所述第二Grin光纤准直及聚焦后的绿色倍频激光进行聚焦传输；a fourth coreless optical fiber, configured to perform focus transmission on the green double-frequency laser that is collimated and focused by the second Grin fiber;
    激光倍频器输出光纤，用于输出经所述第四无芯光纤聚焦传输后输入的绿色倍频激光，作为泵浦所述光子晶体光纤的泵浦光；a laser frequency multiplier output fiber for outputting a green frequency doubled laser input after being focused and transmitted by the fourth coreless fiber, as pumping light for pumping the photonic crystal fiber;
    结构2：所述全光纤激光倍频器包括依次连接的：Structure 2: The all-fiber laser frequency multiplier includes sequential connections:
    激光倍频器输入光纤，用于接收所述偏振相关型光纤隔离器输出的基频光；a laser frequency multiplier input fiber for receiving a fundamental frequency light output by the polarization dependent fiber isolator;
    第二光纤端帽，用于对经所述激光倍频器输入光纤输入的基频光进行扩束传输，并避免端面反射；a second fiber end cap for expanding and transmitting the fundamental light input through the input fiber of the laser frequency multiplier, and avoiding end surface reflection;
    第一激光准直透镜，用于对经所述第二光纤端帽扩束传输后输入的基频光进行准直；a first laser collimating lens for collimating the fundamental light input after the second fiber end cap is expanded and transmitted;
    第一激光聚焦透镜，用于对经所述第一激光准直透镜准直后的基频光进行聚焦；a first laser focusing lens for focusing a fundamental light that is collimated by the first laser collimating lens;
    倍频晶体，用于对经所述第一激光聚焦透镜聚焦后的基频光进行倍频，产生绿色倍频激光；a frequency doubling crystal for multiplying a fundamental frequency light that is focused by the first laser focusing lens to generate a green frequency doubling laser;
    第二激光准直透镜，用于对所述倍频晶体产生的绿色倍频激光进行准直；a second laser collimating lens for collimating the green frequency doubled laser generated by the frequency doubling crystal;
    第二激光聚焦透镜，用于对经所述第二激光准直透镜准直后的绿色倍频激光进行聚焦；a second laser focusing lens for focusing a green double-frequency laser that is collimated by the second laser collimating lens;
    第三光纤端帽，用于避免端面反射，并输出经所述第二激光聚焦透镜聚焦后的绿色倍频激光；a third fiber end cap for avoiding end surface reflection and outputting a green frequency doubled laser focused by the second laser focusing lens;
    激光倍频器输出光纤，用于输出经所述第三光纤端帽输入的绿色倍频激光；a laser frequency multiplier output fiber for outputting a green frequency doubled laser input through the third fiber end cap;
    上述两种结构中：In the above two structures:
    所述偏振相关型光纤隔离器的输出端与所述激光倍频器输入光纤连接；An output end of the polarization dependent fiber optic isolator is coupled to the laser frequency multiplier input fiber;
    所述激光倍频器输出光纤与所述光子晶体光纤连接。The laser frequency multiplier output fiber is coupled to the photonic crystal fiber.
  2. 如权利要求1所述的基于绿光光纤激光器泵浦的可见光超连续谱光源，其特征在于，所述激光倍频器输出光纤为截止波长低于0.5μm的单模保偏光纤。The visible light supercontinuum source based on a green fiber laser pump according to claim 1, wherein the laser frequency multiplier output fiber is a single mode polarization maintaining fiber having a cutoff wavelength of less than 0.5 μm.
  3. 如权利要求1所述的基于绿光光纤激光器泵浦的可见光超连续谱光源，其特征在于，所述线偏振窄线宽光纤激光器的脉宽不大于10皮秒；The visible light supercontinuum source for pumping a green light fiber laser based on claim 1 , wherein the linearly polarized narrow linewidth fiber laser has a pulse width of no more than 10 picoseconds;
    所述光子晶体光纤为非锥形石英光子晶体光纤或锥形石英光子晶体光纤；The photonic crystal fiber is a non-tapered quartz photonic crystal fiber or a tapered quartz photonic crystal fiber;
    所述非锥形石英光子晶体光纤的零色散波长位于近红外波段；The zero-dispersion wavelength of the non-tapered quartz photonic crystal fiber is located in the near-infrared band;
    所述锥形石英光子晶体光纤的零色散波长在其锥形过渡区中从近红外波段逐渐降低到绿光波段，接近但小于所述绿光光纤激光器的输出波长。The zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser.
  4. 如权利要求1所述的基于绿光光纤激光器泵浦的可见光超连续谱光源，其特征在于，所述线偏振窄线宽光纤激光器的脉宽大于10皮秒；The visible light supercontinuum source based on a green fiber laser pump according to claim 1, wherein the linear polarization narrow linewidth fiber laser has a pulse width greater than 10 picoseconds;
    所述光子晶体光纤为锥形石英光子晶体光纤；The photonic crystal fiber is a tapered quartz photonic crystal fiber;
    所述锥形石英光子晶体光纤的零色散波长在其锥形过渡区中从近红外波段逐渐降低到绿光波段，接近但小于所述绿光光纤激光器的输出波长。The zero-dispersion wavelength of the tapered quartz photonic crystal fiber gradually decreases from the near-infrared band to the green band in its tapered transition region, which is close to but smaller than the output wavelength of the green fiber laser.
  5. 如权利要求1所述的基于绿光光纤激光器泵浦的可见光超连续谱光源，其特征在于，所述线偏振窄线宽光纤激光器为工作波长为1 μm的掺Yb光纤激光器。A visible light supercontinuum source based on a green fiber laser pump according to claim 1, wherein said linearly polarized narrow linewidth fiber laser has an operating wavelength of 1 Μm Yb-doped fiber laser.
  6. 如权利要求1所述的基于绿光光纤激光器泵浦的可见光超连续谱光源，其特征在于，所述线偏振窄线宽光纤激光器的输出端的光纤、所述偏振相关型光纤隔离器的输入端及输出端的光纤及所述激光倍频器输入光纤为参数相同的保偏光纤。A visible light supercontinuum source based on a green fiber laser pump according to claim 1, wherein an optical fiber at an output end of said linearly polarized narrow linewidth fiber laser and an input end of said polarization dependent fiber isolator The optical fiber at the output end and the input fiber of the laser frequency multiplier are the polarization-maintaining fibers with the same parameters.
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