WO2020177343A1 - Frequency conversion apparatus for hollow-core anti-resonant optical fiber - Google Patents

Frequency conversion apparatus for hollow-core anti-resonant optical fiber Download PDF

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Publication number
WO2020177343A1
WO2020177343A1 PCT/CN2019/113193 CN2019113193W WO2020177343A1 WO 2020177343 A1 WO2020177343 A1 WO 2020177343A1 CN 2019113193 W CN2019113193 W CN 2019113193W WO 2020177343 A1 WO2020177343 A1 WO 2020177343A1
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Prior art keywords
hollow
optical fiber
core anti
vacuum tube
core
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PCT/CN2019/113193
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French (fr)
Chinese (zh)
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白振岙
龙明亮
梁勇
孙彪
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杭州奕力科技有限公司
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • 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
    • H01S4/00—Devices using stimulated emission of electromagnetic radiation in wave ranges other than those covered by groups H01S1/00, H01S3/00 or H01S5/00, e.g. phonon masers, X-ray lasers or gamma-ray lasers

Definitions

  • the invention belongs to the field of laser technology, and more specifically, relates to a frequency up-conversion device of a hollow-core anti-resonance optical fiber.
  • the hollow core anti-resonance fiber has the characteristics of hollow structure, small dispersion and low transmission loss, and can transmit ultra-wideband. At the same time, it can better confine the optical field in the hollow core, and even transmit peak power of the petawatt level. Pulse.
  • the modal dispersion can be easily adjusted through the microstructure parameters.
  • the filling of high-pressure inert gas in the hollow core fiber can also provide additional material dispersion. When the laser pulse is transmitted in it, the self-focused, focused high-intensity pulse is generated due to the Kerr effect. Ionized inert gas can provide plasma dispersion. The filled inert gas and the generated plasma together affect the nonlinear effect in the optical fiber.
  • Patent application number: CN201710953540.5 Filling the hollow-core anti-resonance fiber with different gases to be measured, the Raman nonlinear effect generated by the gas, thereby realizing the Gas detection, and the Raman intensity generated by the Raman nonlinear effect to determine the concentration of the components in the gas to achieve ambient air detection.
  • High-order harmonic supercontinuum is the key to obtaining high-throughput single attosecond pulses.
  • the single attosecond pulse source has extremely high time resolution and provides a powerful tool for studying the electronic dynamics inside atoms.
  • the photon energy of the high-order harmonic light source is very high, reaching hundreds of electron volts or even higher.
  • the high photon energy makes this light source widely used to study the internal electronic structure of matter.
  • X-rays in the water window band (2.4nm to 4.3nm) have important applications in the field of biological live cell imaging. This is because water absorbs less in the XUV band, while carbon absorbs more in this band.
  • the invention patent "A method of generating attosecond pulses in the water window band" Patent application number: CN201410814248.1 uses a laser pulse to drive inert gas to generate high-order harmonics to obtain attosecond pulses in the water window band.
  • the invention provides a frequency up-conversion device for a hollow-core anti-resonance optical fiber.
  • Ultra-short pulses are incident on the hollow-core anti-resonance optical fiber filled with inert gas to produce nonlinear effects and phase matching, and output high-order harmonics.
  • the anti-resonant fiber is filled with inert gases of different types and pressures to achieve wide-band adjustable output from X-ray to ultraviolet.
  • the hollow core anti-resonance optical fiber has a small core diameter, a compact structure, a small volume and a strong portability.
  • a hollow-core anti-resonance optical fiber frequency up-conversion device including a first 45° reflector, a second 45° reflector, a coupler, a first vacuum tube, a hollow-core anti-resonance optical fiber, an inflation and air pressure controller, and a second vacuum tube , Vacuum chamber.
  • the ultra-short pulse passes through the first 45° reflector and the second 45° reflector to the coupler, the beam is converged and enters the first vacuum tube, and is coupled into the hollow core anti-resonance optical fiber.
  • the other end of the hollow core anti-resonance optical fiber is placed in the second vacuum tube, the gas filling and air pressure controller is connected to the second vacuum tube, and inert gas is introduced from the gas filling and air pressure controller Into the second vacuum tube and the hollow-core anti-resonance fiber, ultrashort pulses are generated in the hollow-core anti-resonance fiber due to nonlinear effects and phase matching to generate high-order harmonics, which can be obtained from X-ray to ultraviolet The spectrum can be adjusted and output to the vacuum chamber.
  • the coupler is composed of a first convex mirror and a second convex mirror, or is composed of a plurality of convex lenses.
  • the focal lengths of the first convex mirror and the second convex mirror are equal, and the focal length is 50-100 mm, The distance between the two is adjustable, and the adjustment range is smaller than the focal length of the first convex mirror, so as to achieve the coupling adjustment of the incident ultrashort pulse light with different divergence angles.
  • the first vacuum tube and the second vacuum tube are metal vacuum tubes, and the vacuum degree is less than or equal to 10 mTorr (1 Torr is equal to 1 mm mercury column pressure).
  • the core diameter of the hollow core anti-resonance optical fiber is 10 to 1000 um
  • the length of the optical fiber is 1 mm to 1 m
  • the inner structure of the core is a hollow core anti-resonance structure.
  • the hollow core anti-resonance optical fiber is completely sealed and placed between the first vacuum tube and the second vacuum tube.
  • One end of the charging and air pressure controller is an air inlet, which is connected to a high-pressure gas source, and the other end is an air outlet, which is connected to the second vacuum tube.
  • the outer diameter of the vacuum chamber is 10-100mm, the inner diameter is 5mm-80mm, and the length is 0.5m-3m.
  • One end is connected with the second vacuum tube, and the vacuum degree is less than or equal to 100mTorr.
  • the first 45° reflector and the second 45° reflector are plated with a 45° high reflection film consistent with the incident ultrashort pulse.
  • the coupler and the first vacuum tube are coated with a high-transmittance film consistent with the incident ultrashort pulse.
  • the invention provides a frequency up-conversion device for a hollow-core anti-resonance optical fiber. After an ultrashort pulse is coupled and incident to the hollow-core anti-resonance optical fiber, a nonlinear effect is generated, high-order harmonics are generated under phase matching, and a wide spectrum band is generated through It is filled with inert gases of different types and pressures to obtain a wide band adjustable output from X-ray to ultraviolet.
  • Figure 1 is the optical path design diagram
  • Figure 1 shows the design of the optical path with the size of part of the actual device.
  • the present invention provides a frequency up-conversion device of a hollow core anti-resonant fiber, which includes a first 45° reflector 1, a second 45° reflector 2, a coupler 3, a first vacuum tube 4, a hollow core anti-resonant fiber 5, Inflation and air pressure controller 6, first vacuum tube 7, vacuum chamber 8.
  • the ultra-short pulse is reflected by the first 45° reflector 1 and the second 45° reflector 2 to the coupler 3, the beam is converged and incident through the first vacuum tube 4, and is coupled into One end of the hollow-core anti-resonance fiber 5 in the first vacuum tube 4, and the other end of the hollow-core anti-resonance fiber 5 is placed in the second vacuum tube 7, and the inflation and air pressure
  • the controller 6 is connected to the first vacuum tube 7, and one of the inert gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), etc.
  • the harmonics are controlled by the charging and air pressure controller 6 to control the type and pressure of the inlet inert gas to realize the dispersion of the hollow-core anti-resonant fiber 5 and the phase matching management of the nonlinear frequency conversion, which can be obtained from the X-ray
  • the adjustable output to the wide spectrum range of ultraviolet is output to the vacuum chamber 8.
  • the first 45° reflector 1 and the second 45° reflector 2 can be adjusted left and right to achieve collimated incidence of ultrashort pulses into the coupler 3.
  • the coupler 3 is composed of a first convex mirror 31 and a second convex mirror 32.
  • the focal lengths of the first convex mirror 31 and the second convex mirror 32 are equal, and the focal length is 50-100 mm.
  • the distance between the two is adjustable, and the adjustment range is smaller than that of the first convex mirror 11.
  • the focal length can achieve the coupling adjustment of the incident ultrashort pulse light with different divergence angles.
  • the first vacuum tube 4 and the second vacuum tube 7 are metal vacuum tubes with a vacuum degree ⁇ 10 mTorr to avoid ionization caused by gas in the air after the ultrashort pulses converge.
  • one end of the hollow-core anti-resonance optical fiber 5 is completely sealed and placed in the first vacuum tube 4, and the other end is placed in the second vacuum tube 7.
  • the hollow core anti-resonant optical fiber 5 has an inner core core diameter of 10 to 1000 um, a fiber length of 1 mm to 1 m, and a core structure of a hollow core anti-resonant structure to obtain different bands for frequency conversion, according to the ultrashort pulse Peak power, select the appropriate core diameter and length.
  • one end of the charging and air pressure controller 6 is an air inlet, connected to a high-pressure gas source, and the other end is an air outlet, connected to the second vacuum tube 7, and the air outlet is realized by controlling the gas flow of the air inlet The pressure control of the inert gas.
  • the vacuum cavity 8 has an outer diameter of 10-100 mm, an inner diameter of 5 mm to 80 mm, a length of 0.5 m to 3 m, and a vacuum degree ⁇ 100 mTorr, so as to realize waveguide transmission from X-rays to the ultraviolet spectrum.
  • the second vacuum tube 7 is completely sealed in the vacuum chamber 8.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

A frequency conversion apparatus for a hollow-core anti-resonant optical fiber, comprising a first 45° reflecting mirror (1), a second 45° reflecting mirror (3), a coupler, a first vacuum tube (4), a hollow-core anti-resonant optical fiber (5), a gas filling and gas pressure controller (6), a second vacuum tube (7), and a vacuum cavity (8). The optical fiber structure of the hollow-core anti-resonant optical fiber (5) is provided with a chromatic dispersion management capability, and ultra-short laser pulses are coupled and radiated into the hollow-core anti-resonant optical fiber (5), thus being able to generate various nonlinear effects. By means of filling the hollow-core anti-resonant optical fiber (5) with noble gases of various types and pressures, adjustment of optical frequency conversion of laser pulses can be implemented, and further, by means of optimizing the structure of the hollow-core anti-resonant optical fiber (5), phase matching and chromatic dispersion compensation can be effectively implemented in the process of optical frequency conversion, allowing for highly efficient ultra-wide band conversion in the range of ultraviolet to X-rays.

Description

一种空芯反谐振光纤的频率上转换装置Frequency up-conversion device of hollow-core anti-resonance optical fiber 技术领域Technical field
本发明属于激光技术领域，更具体地讲，涉及一种空芯反谐振光纤的频率上转换装置。The invention belongs to the field of laser technology, and more specifically, relates to a frequency up-conversion device of a hollow-core anti-resonance optical fiber.
背景技术Background technique
空芯反谐振光纤具有中空结构、很小的色散以及低传输损耗等特点，能超宽带传输，同时可将光场较好地限制在中空纤芯中，甚至可以传输峰值功率为拍瓦量级的脉冲。通过微结构参数可以很方便的调节其模式色散，在空芯光纤中填充高压惰性气体还可提供额外的材料色散，激光脉冲在其中传输时因克尔效应而产生自聚焦，聚焦的高强度脉冲电离惰性气体可提供等离子体色散。填充的惰性气体和产生的等离子体共同影响光纤中的非线性效应。发明专利《一种基于空芯反谐振光纤的气体检测系统》专利申请号：CN201710953540.5在空芯反谐振光纤充入不同的待测气体，由气体产生的拉曼非线性效应，从而实现对气体的检测，并由拉曼非线性效应产生的拉曼普强度来确定气体内成分的浓度，实现环境空气的检测。The hollow core anti-resonance fiber has the characteristics of hollow structure, small dispersion and low transmission loss, and can transmit ultra-wideband. At the same time, it can better confine the optical field in the hollow core, and even transmit peak power of the petawatt level. Pulse. The modal dispersion can be easily adjusted through the microstructure parameters. The filling of high-pressure inert gas in the hollow core fiber can also provide additional material dispersion. When the laser pulse is transmitted in it, the self-focused, focused high-intensity pulse is generated due to the Kerr effect. Ionized inert gas can provide plasma dispersion. The filled inert gas and the generated plasma together affect the nonlinear effect in the optical fiber. Invention patent "A gas detection system based on hollow-core anti-resonance fiber" Patent application number: CN201710953540.5 Filling the hollow-core anti-resonance fiber with different gases to be measured, the Raman nonlinear effect generated by the gas, thereby realizing the Gas detection, and the Raman intensity generated by the Raman nonlinear effect to determine the concentration of the components in the gas to achieve ambient air detection.
高次谐波超连续谱是高通量单阿秒脉冲获得的关键，单阿秒脉冲光源具有极高的时间分辨率，为研究原子内部的电子动力学行为提供了强有力的工具。高次谐波光源的光子能量很高，可达到百电子伏甚至更高量级。高光子能量使得该光源被广泛应用于研究物质内部的电子结构。水窗波段(2.4nm到4.3nm)的X射线在生物活细胞成像领域有着重要应用。这是因为水对该XUV波段的吸收较少，而炭对该波段的吸收较多。发明专利《一种产生水窗波段阿秒脉冲的方法》专利申请号：CN201410814248.1中用激光脉冲驱动作用惰性气体，产生高次谐波，获得水窗波段的阿秒脉冲。High-order harmonic supercontinuum is the key to obtaining high-throughput single attosecond pulses. The single attosecond pulse source has extremely high time resolution and provides a powerful tool for studying the electronic dynamics inside atoms. The photon energy of the high-order harmonic light source is very high, reaching hundreds of electron volts or even higher. The high photon energy makes this light source widely used to study the internal electronic structure of matter. X-rays in the water window band (2.4nm to 4.3nm) have important applications in the field of biological live cell imaging. This is because water absorbs less in the XUV band, while carbon absorbs more in this band. The invention patent "A method of generating attosecond pulses in the water window band" Patent application number: CN201410814248.1 uses a laser pulse to drive inert gas to generate high-order harmonics to obtain attosecond pulses in the water window band.
发明内容Summary of the invention
本发明提供了一种空芯反谐振光纤的频率上转换装置，超短脉冲入射至充满惰性气体的空芯反谐振光纤中产生非线性效应及相位匹配，输出高次谐波，通过对空芯反谐振光纤填充不同种类与压强的惰性气体，实现X射线至紫外的宽谱带可调输出。空芯反谐振光纤光纤芯径小、结构紧凑，体积小，可便携性强。The invention provides a frequency up-conversion device for a hollow-core anti-resonance optical fiber. Ultra-short pulses are incident on the hollow-core anti-resonance optical fiber filled with inert gas to produce nonlinear effects and phase matching, and output high-order harmonics. The anti-resonant fiber is filled with inert gases of different types and pressures to achieve wide-band adjustable output from X-ray to ultraviolet. The hollow core anti-resonance optical fiber has a small core diameter, a compact structure, a small volume and a strong portability.
所述技术方案如下：The technical solution is as follows:
一种空芯反谐振光纤的频率上转换装置，包括第一45°反射镜，第二45°反射镜，耦合器、第一真空管、空芯反谐振光纤、充气和气压控制器、第二真空管、真空腔。超短脉冲经所述的第一45°反射镜、所述的第二45°反射镜至所述的耦合器，光束会聚入射进所述的第一真空管，耦合进所述的空芯反谐振光纤。所述的空芯反谐振光纤另一端置于所述的第二真空管内，所述的充气和气压控制器与所述的第二真空管相连接，惰性气体从所述的充气和气压控制器导入进所述的第二真空管与所述的空芯反谐振光纤，超短脉冲在所述的空芯反谐振光纤中由非线性效应及相位匹配产生高次谐波，获得可从X射线至紫外谱段的可调，输出至所述的真空腔中。A hollow-core anti-resonance optical fiber frequency up-conversion device, including a first 45° reflector, a second 45° reflector, a coupler, a first vacuum tube, a hollow-core anti-resonance optical fiber, an inflation and air pressure controller, and a second vacuum tube , Vacuum chamber. The ultra-short pulse passes through the first 45° reflector and the second 45° reflector to the coupler, the beam is converged and enters the first vacuum tube, and is coupled into the hollow core anti-resonance optical fiber. The other end of the hollow core anti-resonance optical fiber is placed in the second vacuum tube, the gas filling and air pressure controller is connected to the second vacuum tube, and inert gas is introduced from the gas filling and air pressure controller Into the second vacuum tube and the hollow-core anti-resonance fiber, ultrashort pulses are generated in the hollow-core anti-resonance fiber due to nonlinear effects and phase matching to generate high-order harmonics, which can be obtained from X-ray to ultraviolet The spectrum can be adjusted and output to the vacuum chamber.
所述的耦合器由第一凸反镜与第二凸反镜组成，或由多个凸透镜组成，所述的第一凸反镜与第二凸反镜的焦距相等，焦距为50～100mm，其二者的间距可调，调节范围小于所述的第一凸反镜的焦距，达到对不同发散角的入射超短脉冲光的耦合调节。The coupler is composed of a first convex mirror and a second convex mirror, or is composed of a plurality of convex lenses. The focal lengths of the first convex mirror and the second convex mirror are equal, and the focal length is 50-100 mm, The distance between the two is adjustable, and the adjustment range is smaller than the focal length of the first convex mirror, so as to achieve the coupling adjustment of the incident ultrashort pulse light with different divergence angles.
所述的第一真空管、第二真空管为金属材质的真空管，其真空度≤10mTorr(1Torr等于1毫米水银柱压强)。The first vacuum tube and the second vacuum tube are metal vacuum tubes, and the vacuum degree is less than or equal to 10 mTorr (1 Torr is equal to 1 mm mercury column pressure).
所述的空芯反谐振光纤芯芯径10～1000um，光纤的长度1mm～1m，芯内结构为空芯反谐振结构。The core diameter of the hollow core anti-resonance optical fiber is 10 to 1000 um, the length of the optical fiber is 1 mm to 1 m, and the inner structure of the core is a hollow core anti-resonance structure.
所述的空芯反谐振光纤完全密封置于所述的第一真空管与所述的第二真空管之间。The hollow core anti-resonance optical fiber is completely sealed and placed between the first vacuum tube and the second vacuum tube.
所述的充气和气压控制器一端为进气口，接高压气体源，另一端为出气口，与所述的第二真空管相接。One end of the charging and air pressure controller is an air inlet, which is connected to a high-pressure gas source, and the other end is an air outlet, which is connected to the second vacuum tube.
所述的真空腔外径10～100mm，内径5mm～80mm，长度0.5m～3m，一端与所述的第二真空管连接，真空度≤100mTorr。The outer diameter of the vacuum chamber is 10-100mm, the inner diameter is 5mm-80mm, and the length is 0.5m-3m. One end is connected with the second vacuum tube, and the vacuum degree is less than or equal to 100mTorr.
所述的第一45°反射镜与所述的第二45°反射镜镀有与入射超短脉冲相一致的45°高反膜。The first 45° reflector and the second 45° reflector are plated with a 45° high reflection film consistent with the incident ultrashort pulse.
所述的耦合器与第一真空管镀有与入射超短脉冲相一致的高透膜。The coupler and the first vacuum tube are coated with a high-transmittance film consistent with the incident ultrashort pulse.
本发明提供的技术方案带来的有益效果是：The beneficial effects brought by the technical solution provided by the present invention are:
本发明提供一种空芯反谐振光纤的频率上转换装置，超短脉冲耦合入射至空芯反谐振光纤后，产生非线性效应，在相位匹配下产生高次谐波，生成宽谱带， 通过充入不同种类与压强的惰性气体，获得可从X射线至紫外的宽谱带可调节输出。The invention provides a frequency up-conversion device for a hollow-core anti-resonance optical fiber. After an ultrashort pulse is coupled and incident to the hollow-core anti-resonance optical fiber, a nonlinear effect is generated, high-order harmonics are generated under phase matching, and a wide spectrum band is generated through It is filled with inert gases of different types and pressures to obtain a wide band adjustable output from X-ray to ultraviolet.
附图说明Description of the drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.
图1为光路设计图；Figure 1 is the optical path design diagram;
图中：In the picture:
1-第一45°反射镜；2-第二45°反射镜；3-耦合器；31-第一凸反镜；32-第二凸反镜；4-第一真空管；5-空芯反谐振光纤；6-充气和气压控制器；7-第二真空管；8-真空腔。1-first 45°reflector; 2-second 45°reflector; 3-coupler; 31-first convex mirror; 32-second convex mirror; 4-first vacuum tube; 5-hollow core mirror Resonant fiber; 6-inflation and air pressure controller; 7-second vacuum tube; 8-vacuum chamber.
具体实施方式detailed description
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明实施方式作进一步地详细描述。In order to make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
图1是以部分实际器件的大小示出了光路设计图。Figure 1 shows the design of the optical path with the size of part of the actual device.
本发明提供了一种空芯反谐振光纤的频率上转换装置，包括第一45°反射镜1、第二45°反射镜2、耦合器3、第一真空管4、空芯反谐振光纤5、充气和气压控制器6、第一真空管7、真空腔8。The present invention provides a frequency up-conversion device of a hollow core anti-resonant fiber, which includes a first 45° reflector 1, a second 45° reflector 2, a coupler 3, a first vacuum tube 4, a hollow core anti-resonant fiber 5, Inflation and air pressure controller 6, first vacuum tube 7, vacuum chamber 8.
超短脉冲经所述的第一45°反射镜1、所述的第二45°反射镜2反射至所述的耦合器3，光束会聚入射通过所述的第一真空管4，耦合进置于所述的第一真空管4内的所述的空芯反谐振光纤5的一端，所述的空芯反谐振光纤5的另一端置于所述的第二真空管7中，所述的充气和气压控制器6连接所述的第一真空管7连接起来，惰性气体氦(He)、氖(Ne)、氩(Ar)、氪(Kr)、氙(Xe)等其中的一种从所述的充气和气压控制器6导入进所述的第一真空管7与所述的空芯反谐振光纤5，超短脉冲在所述的空芯反谐振光纤5中由非线性效应及相位匹配，产生高次谐波，通过所述的充气和气压控制器6控制进气惰性气体的种类与压强，实现所述的空芯反谐振光纤5的色散及非线性频率转换的相位匹配管理，获得可从X射线至紫外宽谱范围内的可调输出，输出至所述的真空腔8中。The ultra-short pulse is reflected by the first 45° reflector 1 and the second 45° reflector 2 to the coupler 3, the beam is converged and incident through the first vacuum tube 4, and is coupled into One end of the hollow-core anti-resonance fiber 5 in the first vacuum tube 4, and the other end of the hollow-core anti-resonance fiber 5 is placed in the second vacuum tube 7, and the inflation and air pressure The controller 6 is connected to the first vacuum tube 7, and one of the inert gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), etc. is charged from the And the air pressure controller 6 is introduced into the first vacuum tube 7 and the hollow core anti-resonant fiber 5, and the ultra-short pulses are generated in the hollow core anti-resonant fiber 5 due to nonlinear effects and phase matching. The harmonics are controlled by the charging and air pressure controller 6 to control the type and pressure of the inlet inert gas to realize the dispersion of the hollow-core anti-resonant fiber 5 and the phase matching management of the nonlinear frequency conversion, which can be obtained from the X-ray The adjustable output to the wide spectrum range of ultraviolet is output to the vacuum chamber 8.
优选地，所述的第一45°反射镜1与所述的第二45°反射镜2左右俯仰可调节，实现超短脉冲准直入射进所述的耦合器3中。Preferably, the first 45° reflector 1 and the second 45° reflector 2 can be adjusted left and right to achieve collimated incidence of ultrashort pulses into the coupler 3.
优选地，所述的耦合器3由第一凸反镜31与第二凸反镜32组成。Preferably, the coupler 3 is composed of a first convex mirror 31 and a second convex mirror 32.
优选地，所述的第一凸反镜31与第二凸反镜32的焦距相等，焦距为50～100mm，其二者的间距可调，调节范围小于所述的第一凸反镜11的焦距，达到对不同发散角的入射超短脉冲光的耦合调节。Preferably, the focal lengths of the first convex mirror 31 and the second convex mirror 32 are equal, and the focal length is 50-100 mm. The distance between the two is adjustable, and the adjustment range is smaller than that of the first convex mirror 11. The focal length can achieve the coupling adjustment of the incident ultrashort pulse light with different divergence angles.
优选地，所述的第一真空管4与所述的第二真空管7为金属材质的真空管，其真空度≤10mTorr，避免超短脉冲会聚后因空气中的气体等产生电离。Preferably, the first vacuum tube 4 and the second vacuum tube 7 are metal vacuum tubes with a vacuum degree ≤ 10 mTorr to avoid ionization caused by gas in the air after the ultrashort pulses converge.
优选地，所述的空芯反谐振光纤5一端完全密封置于所述的第一真空管4中，另一端置于所述的第二真空管7中。Preferably, one end of the hollow-core anti-resonance optical fiber 5 is completely sealed and placed in the first vacuum tube 4, and the other end is placed in the second vacuum tube 7.
优选地，所述的空芯反谐振光纤5内芯芯径10～1000um，光纤的长度1mm～1m，纤芯结构为空芯反谐振结构，对频率转换获得不同的波段，根据超短脉冲的峰值功率，选择合适的芯径与长度。Preferably, the hollow core anti-resonant optical fiber 5 has an inner core core diameter of 10 to 1000 um, a fiber length of 1 mm to 1 m, and a core structure of a hollow core anti-resonant structure to obtain different bands for frequency conversion, according to the ultrashort pulse Peak power, select the appropriate core diameter and length.
优选地，所述的充气和气压控制器6一端为进气口，接高压气体源，另一端为出气口，与所述的第二真空管7相接，通过控制进气口气体流量实现出气口的气压控制，即对惰性气体的气压控制。Preferably, one end of the charging and air pressure controller 6 is an air inlet, connected to a high-pressure gas source, and the other end is an air outlet, connected to the second vacuum tube 7, and the air outlet is realized by controlling the gas flow of the air inlet The pressure control of the inert gas.
优选地，所述的真空腔8外径10～100mm，内径5mm～80mm，长度0.5m～3m，真空度≤100mTorr，实现X射线至紫外谱段的波导传输。Preferably, the vacuum cavity 8 has an outer diameter of 10-100 mm, an inner diameter of 5 mm to 80 mm, a length of 0.5 m to 3 m, and a vacuum degree ≤ 100 mTorr, so as to realize waveguide transmission from X-rays to the ultraviolet spectrum.
优选地，所述的第二真空管7完全密封于所述的真空腔8内。Preferably, the second vacuum tube 7 is completely sealed in the vacuum chamber 8.
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。The sequence numbers of the foregoing embodiments of the present invention are only for description, and do not represent the superiority of the embodiments.
以上所述仅为本发明的较佳实施例，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、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.

Claims (7)

  1. 一种空芯反谐振光纤的频率上转换装置，包括第一45°反射镜(1)，第二45°反射镜(2)，耦合器(3)，第一真空管(4)，空芯反谐振光纤(5)，充气和气压控制器(6)，第二真空管(7)和真空腔(8)；其特征在于，超短脉冲经所述的第一45°反射镜(1)、所述的第二45°反射镜(2)至所述的耦合器(3)，光束会聚入射进所述的第一真空管(4)，耦合进所述的空芯反谐振光纤(5)，超短脉冲在所述的空芯反谐振光纤(5)中由非线性效应及相位匹配产生高次谐波，并由所述的充气和气压控制器(6)获得可从X射线至紫外谱段的可调，经所述的第二真空管(7)至所述的真空腔(8)中。A hollow-core anti-resonance optical fiber frequency up-conversion device includes a first 45° reflector (1), a second 45° reflector (2), a coupler (3), a first vacuum tube (4), and a hollow core The resonant fiber (5), the inflation and air pressure controller (6), the second vacuum tube (7) and the vacuum chamber (8); characterized in that the ultra-short pulse passes through the first 45° reflector (1), the From the second 45° reflector (2) to the coupler (3), the light beam is converged and incident into the first vacuum tube (4), coupled into the hollow core anti-resonance fiber (5), and super Short pulses are generated in the hollow core anti-resonance fiber (5) by nonlinear effects and phase matching to generate high-order harmonics, and are obtained by the inflation and air pressure controller (6), which can range from X-ray to ultraviolet spectrum Adjustable through the second vacuum tube (7) to the vacuum chamber (8).
  2. 根据权利要求1所述的一种空芯反谐振光纤的频率上转换装置，其特征在于，所述耦合器(3)由第一凸透镜(31)与第二凸反镜(32)，或由多个凸透镜组成，其焦距为50～1000mm。A hollow-core anti-resonance fiber frequency up-conversion device according to claim 1, wherein the coupler (3) consists of a first convex lens (31) and a second convex mirror (32), or It is composed of multiple convex lenses with a focal length of 50-1000mm.
  3. 根据权利要求1所述的一种空芯反谐振光纤的频率上转换装置，其特征在于，所述的第一真空管(4)与所述的第二真空管(7)为金属材质的真空管，其真空度≤10mTorr。A hollow-core anti-resonance optical fiber frequency up-conversion device according to claim 1, wherein the first vacuum tube (4) and the second vacuum tube (7) are metal vacuum tubes, which Vacuum degree ≤10mTorr.
  4. 根据权利要求1所述的所述的一种空芯反谐振光纤的频率上转换装置，其特征在于，所述的空芯反谐振光纤(5)内芯芯径10～1000um，光纤的长度1mm到1m，纤芯结构为空芯反谐振结构。The frequency up-conversion device of a hollow-core anti-resonant optical fiber according to claim 1, wherein the inner core diameter of the hollow-core anti-resonant optical fiber (5) is 10~1000um, and the length of the optical fiber is 1mm. To 1m, the core structure is a hollow core anti-resonance structure.
  5. 根据权利要求1所述的一种空芯反谐振光纤的频率上转换装置，其特征在于，所述的充气和气压控制器(6)的一端为进气口，接高压气体源，另一端为出气口，与所述的第二真空管(7)相接。A hollow-core anti-resonance optical fiber frequency up-conversion device according to claim 1, wherein one end of the charging and air pressure controller (6) is an air inlet, connected to a high-pressure gas source, and the other end is The air outlet is connected with the second vacuum tube (7).
  6. 根据权利要求1所述的一种空芯反谐振光纤的频率上转换装置，其特征在于，所述的真空腔(8)，其真空度≤100mTorr，外径10～100mm，内径5mm～80mm，长度0.5m～3m。A hollow-core anti-resonance optical fiber frequency up-conversion device according to claim 1, wherein the vacuum cavity (8) has a vacuum degree ≤ 100 mTorr, an outer diameter of 10 to 100 mm, and an inner diameter of 5 mm to 80 mm, The length is 0.5m～3m.
  7. 根据权利要求1的所述的一种空芯反谐振光纤的频率上转换装置，其特征在于，所述第一45°反射镜(1)和第二45°反射镜(2)镀有与入射超短脉冲相一致的45°高反膜，所述的耦合器(3)与所述的第一真空管(4)窗口镀有与入射超短脉冲相一致的高透膜。The frequency up-conversion device of a hollow-core anti-resonance optical fiber according to claim 1, wherein the first 45° reflector (1) and the second 45° reflector (2) are plated with the incident A 45° high reflection film consistent with the ultrashort pulse, and the coupler (3) and the window of the first vacuum tube (4) are plated with a high transmission film consistent with the incident ultrashort pulse.
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