CN105356218A - 一种低损耗的高重频激光脉冲调制器 - Google Patents

一种低损耗的高重频激光脉冲调制器 Download PDF

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CN105356218A
CN105356218A CN201510853580.3A CN201510853580A CN105356218A CN 105356218 A CN105356218 A CN 105356218A CN 201510853580 A CN201510853580 A CN 201510853580A CN 105356218 A CN105356218 A CN 105356218A
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splitting ratio
beam splitter
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type splitting
optical fiber
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史伟
于振华
董信征
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TIANJIN OUTAI LASER TECHNOLOGY Co Ltd
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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
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    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2861—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
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    • 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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/011—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 for the control of the intensity, phase, polarisation or colour  in optical waveguides, not otherwise provided for in this subclass
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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
    • 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
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • 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
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    • G02F2201/20—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 delay line
    • 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
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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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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Abstract

一种低损耗的高重频激光脉冲调制器。其包括两个1*2型分光比1:1分束器、多个光延迟模块、多个2*2型分光比1:1分束器和多根光纤；两个1*2型分光比1:1分束器设在输入和输出端；多个2*2型分光比1:1分束器设置在两1*2型分光比1:1分束器之间，相邻1*2型分光比1:1分束器和2*2型分光比1:1分束器或2*2型分光比1:1分束器间利用两根光纤相连且其中一根上连接光延迟模块。本发明只使用1*2型分光比1:1分束器、光延迟模块和2*2型分光比1:1分束器三种器件，器件简单，组合新颖、紧凑；2*2型分光比1:1分束器能将两束脉冲激光合成一束，还能将其分成强度相同两束脉冲激光，且损耗很低。

Description

一种低损耗的高重频激光脉冲调制器
技术领域
本发明属于光纤及激光技术领域，特别是涉及一种低损耗的高重频激光脉冲调制器。
背景技术
近年来，高重复频率的脉冲激光器已被广泛应用在光频率测量、高速电光采样以及激光测距、高平均功率超快激光器等领域，并且拥有重要的应用价值。对于常见的光纤激光器来说，可以很容易得到千赫兹到百兆赫兹的脉冲序列。但受限于增益光纤的长度外加各种器件及尾纤的长度，因此很难进一步提高光纤激光器的重复频率。
发明内容
为了解决上述问题，本发明的目的在于提供一种低损耗的高重频激光脉冲调制器。
为了达到上述目的，本发明提供的低损耗的高重频激光脉冲调制器包括两个1*2型分光比1:1分束器、多个光延迟模块、多个2*2型分光比1:1分束器和多根光纤；其中两个1*2型分光比1:1分束器分别设置在输入端和输出端；多个2*2型分光比1:1分束器设置在两个1*2型分光比1:1分束器之间，相邻1*2型分光比1:1分束器和2*2型分光比1:1分束器或2*2型分光比1:1分束器之间均利用两根光纤相连且其中一根光纤上连接一个光延迟模块。
所述的连接在相邻1*2型分光比1:1分束器和2*2型分光比1:1分束器或2*2型分光比1:1分束器之间的两根光纤具有不同的长度，长度差其中c为光速，n为光纤的折射率，k为自然数，t为相邻器件中传输的激光内脉冲与脉冲之间的时间间隔。
本发明提供的低损耗的高重频激光脉冲调制器只使用1*2型分光比1:1分束器、光延迟模块和2*2型分光比1:1分束器三种器件，因此器件简单，组合新颖、紧凑；另外，2*2型分光比1:1分束器不仅能够将两束脉冲激光合成一束，还能够将其分成强度相同的两束脉冲激光，并且损耗很低，而如果利用1*2型分光比1:1分束器将两束激光合成一束，然后再利用1*2型分光比1:1分束器分成两束，该过程会有接近50％的损耗，所以调制器件大部分选用了2*2型分光比1:1分束器，以实现激光脉冲低损耗相互耦合，并通过光延迟模块调节相邻分束器之间的光纤长度差△l，以增加激光脉冲的重复频率。
附图说明
图1为本发明提供的低损耗的高重频激光脉冲调制器结构示意图。
具体实施方式
下面结合附图和具体实施例对本发明提供的低损耗的高重频激光脉冲调制器进行详细说明。
如图1所示，本发明提供的低损耗的高重频激光脉冲调制器包括两个1*2型分光比1:1分束器1、多个光延迟模块2、多个2*2型分光比1:1分束器3和多根光纤4；其中两个1*2型分光比1:1分束器1分别设置在输入端和输出端；多个2*2型分光比1:1分束器3设置在两个1*2型分光比1:1分束器1之间，相邻1*2型分光比1:1分束器1和2*2型分光比1:1分束器3或2*2型分光比1:1分束器3之间均利用两根光纤4相连且其中一根光纤4上连接一个光延迟模块2。
所述的连接在相邻1*2型分光比1:1分束器1和2*2型分光比1:1分束器3或2*2型分光比1:1分束器3之间的两根光纤4具有不同的长度，长度差其中c为光速，n为光纤的折射率，k为自然数，t为两根光纤4传输的激光内脉冲与脉冲之间的时间间隔。
现将本发明提供的低损耗的高重频激光脉冲调制器制造过程及工作原理阐述如下：
制造过程：在连接任意相邻1*2型分光比1:1分束器1和2*2型分光比1:1分束器3或2*2型分光比1:1分束器3之间的两根光纤4及光延迟模块2前，先确定一个上述两根光纤4的长度差△l，然后人工粗略地控制光纤4的长度，并完成光纤4及光延迟模块2的焊接操作，之后再利用光延迟模块2精密地拉伸与其相连接的光纤4，利用调节该光纤4长度的方法来严格控制两根光纤4之间的长度差△l，并且利用示波器实时监测两根光纤4的脉冲信号，直到叠加脉冲分布均匀为止，此时重复频率变为原来的2倍。
工作原理：使用时，首先利用位于输入端的1*2型分光比1:1分束器1将一束重复频率为f的低重频脉冲激光分为两束强度相同的脉冲激光，其中一束脉冲激光通过一根光纤4传输给第一个2*2型分光比1:1分束器3，另一束脉冲激光通过另一根光纤4及光延迟模块2也传输给第一个2*2型分光比1:1分束器3，然后由第一个2*2型分光比1:1分束器3将上述两束激光相互耦合，之后再分成两束强度相同的脉冲激光，光延迟模块2的作用是通过控制两根光纤4之间长度差△l的方法来调节上述两束脉冲激光的光程差，使得通过第一个2*2型分光比1:1分束器3后的脉冲激光分布均匀，同时使耦合后的脉冲激光重复频率加倍，此时重复频率变为2f。经过第一个2*2型分光比1:1分束器3调制后的两路脉冲激光采用上述相同的方法耦合入下一级2*2型分光比1:1分束器3，经过该器件后，重复频率进一步加倍，变为4f，以此类推，这样经过n个2*2型1:1分束器3后，重复频率变为2nf，待重复频率达到要求后，通过位于输出端的1*2型1:1分束器1将两束强度相同、重复频率为2nf的脉冲激光合成一束，最后输出一束重复频率为2(n+2)f的脉冲激光。

Claims (2)

1.一种低损耗的高重频激光脉冲调制器，其特征在于：其包括两个1*2型分光比1:1分束器(1)、多个光延迟模块(2)、多个2*2型分光比1:1分束器(3)和多根光纤(4)；其中两个1*2型分光比1:1分束器(1)分别设置在输入端和输出端；多个2*2型分光比1:1分束器(3)设置在两个1*2型分光比1:1分束器(1)之间，相邻1*2型分光比1:1分束器(1)和2*2型分光比1:1分束器(3)或2*2型分光比1:1分束器(3)之间均利用两根光纤(4)相连且其中一根光纤(4)上连接一个光延迟模块(2)。
2.根据权利要求1所述的低损耗的高重频激光脉冲调制器，其特征在于：所述的连接在相邻1*2型分光比1:1分束器(1)和2*2型分光比1:1分束器(3)或2*2型分光比1:1分束器(3)之间的两根光纤(4)具有不同的长度，长度差其中c为光速，n为光纤的折射率，k为自然数，t为两根光纤(4)所传输的激光内脉冲与脉冲之间的时间间隔。
CN201510853580.3A 2015-11-27 2015-11-27 一种低损耗的高重频激光脉冲调制器 Pending CN105356218A (zh)

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CN105932531A (zh) * 2016-05-31 2016-09-07 中国科学院高能物理研究所 高重复频率激光脉冲生成和延迟时间校准方法
CN108418633A (zh) * 2018-05-07 2018-08-17 中国工程物理研究院激光聚变研究中心 瞬态脉冲电信号光纤传输系统
CN108444606A (zh) * 2018-04-02 2018-08-24 中国工程物理研究院激光聚变研究中心 基于光纤的脉冲信号复制器

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CN105932531A (zh) * 2016-05-31 2016-09-07 中国科学院高能物理研究所 高重复频率激光脉冲生成和延迟时间校准方法
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CN108418633A (zh) * 2018-05-07 2018-08-17 中国工程物理研究院激光聚变研究中心 瞬态脉冲电信号光纤传输系统
CN108418633B (zh) * 2018-05-07 2023-11-07 中国工程物理研究院激光聚变研究中心 瞬态脉冲电信号光纤传输系统

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