CN109494561A - 光学参量啁啾脉冲放大种子光产生装置 - Google Patents

光学参量啁啾脉冲放大种子光产生装置 Download PDF

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CN109494561A
CN109494561A CN201910011936.7A CN201910011936A CN109494561A CN 109494561 A CN109494561 A CN 109494561A CN 201910011936 A CN201910011936 A CN 201910011936A CN 109494561 A CN109494561 A CN 109494561A
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light
reflecting mirror
optical parameter
chirped pulse
pulse amplification
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刘军
王鹏
申雄
李儒新
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Shanghai Institute of Optics and Fine Mechanics of CAS
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106Controlling 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
    • H01S3/108Controlling 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
    • H01S3/1083Controlling 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 using parametric generation
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/35Non-linear optics
    • G02F1/353Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G02F1/3536Four-wave interaction
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/35Non-linear optics
    • G02F1/39Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/35Non-linear optics
    • G02F1/39Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • G02F1/392Parametric amplification

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)

Abstract

一种光学参量啁啾脉冲放大种子光产生装置,其构成包括:在主光路上设置第一聚焦元件,用于频域分光的双色镜,经过双色镜分光的反射光和透射光分别经过多枚反射镜调整光束传播方向,并最终聚焦于一枚三阶非线性薄片中,其中所述反射光所经过的第一反射镜和第二反射镜位于一个平移台上,用于调节时间同步,在级联四波混频的作用下,在所述三阶非线性薄片中会产生频率转移的信号光,所产生的信号光经过第二聚焦元件成像到角色散补偿元件中进行角色散补偿,并最终通过第三聚焦元件准直输出。本发明装置具有结构紧凑,经济实用,装置搭建方便,所获得的信号光能量高,光谱宽,脉冲对比度高,稳定性好,可用于拍瓦级别光学参量啁啾脉冲放大装置的种子光。

Description

光学参量啁啾脉冲放大种子光产生装置
技术领域
本发明涉及非线性频率变换和脉冲对比度提升领域,对于基于光学参量啁啾脉冲放大过程获得高能量高对比度的飞秒激光脉冲很有应用潜力。
背景技术
拍瓦激光脉冲在激光聚变、粒子激光加速、高能辐射源以及实验室天体物理等领域有着重要应用。目前基于以钛宝石为放大增益介质的啁啾脉冲放大技术已经可以获得10PW的飞秒激光脉冲,但是受限于钛宝石的口径,激光峰值功率的进一步提升是个问题,比如怎样获得100PW的激光脉冲?这个时候就需要使用光学参量啁啾脉冲放大技术,基于光学参量啁啾脉冲放大技术所使用的非线性晶体可以做成很大尺寸,很有前景的就是KDP晶体,甚至可以做成直径300mm以上。然而KDP晶体的增益光谱中心波长在910nm附近,而目前实验室的基础光一般来自商业钛宝石放大器,其中心波长位于800nm附近,这就必须基于钛宝石放大器的基础光进行频率转换;另一方面,随着激光强度的增大,激光脉冲的对比度也越来越重要,为了获得高对比度的激光脉冲,首先种子光就需要具有高对比度,而钛宝石放大器出射的基础光,对比度在107左右,因而对于脉冲的净化是必须的。总而言之,为光学参量啁啾脉冲放大激光装置提供合适的种子光,必须兼顾频率转移和对比度提升两个方面。
现阶段基于可饱和吸收体,交叉偏振波产生,以及自衍射等非线性过程都可以实现脉冲净化对比度提升,但是他们无法实现频率转移;激光脉冲频率转移一般要结合多级非共线参量放大以及倍频技术,这就导致种子光的产生装置很复杂,占用很大实验空间且价格昂贵,同时复杂的装置也会对稳定带来不利影响。
发明内容
为了产生适用于光学参量啁啾脉冲放大装置的高对比度、宽光谱范围的种子光,本发明装置基于级联四波混频,只经过一次非线性过程就可以在三阶非线性薄片中产生宽光谱高对比度飞秒激光,并继续使用色散补偿元件进行角色散补偿。该装置结构简单紧凑,所使用元件经济便宜,调节方便,因而也更加稳定。
本发明的技术解决方案如下:
一种光学参量啁啾脉冲放大种子光产生装置,包括:第一聚焦元件、双色镜、置于平移台上的第一反射镜和第二反射镜、第三反射镜、第四反射镜、第五反射镜、三阶非线性薄片、第二聚焦元件、角色散补偿元件和第三聚焦元件。
入射光经第一聚焦元件入射到双色镜,经该双色镜分为反射光和透射光,所述的反射光依次经第一反射镜、第二反射镜和第三反射镜反射后,聚焦到所述的三阶非线性薄片中;所述的透射光依次经所述的第四反射镜和第五反射镜反射后,也聚焦于所述三阶非线性薄片中;通过级联四波混频的作用在所述三阶非线性薄片中产生频率转移的信号光,该信号光经过第二聚焦元件成像到角色散补偿元件中进行角色散补偿后,通过第三聚焦元件准直输出。
所述的角色散补偿为棱镜或者光栅。
所述的频率转移的信号光是基于级联四波混频过程产生,是三阶非线性过程的产物,其时间对比度是入射光的三次方。
与现有技术相比,本发明的有益效果是:
1)可以获得高能量,高对比度,频率得到转移且宽光谱范围的适用于光学参量啁啾脉冲放大装置的种子光;
2)通过角色散补偿装置对所获得的种子光进行角色散补偿,优化了种子光的脉冲特性;
3)种子光的获得仅仅通过一次级联四波混频过程得以实现,装置简单,易于搭建,稳定性好。
附图说明
图1是本发明光学参量啁啾脉冲放大种子光产生装置的光路图
图2是本发明光学参量啁啾脉冲放大种子光产生装置基于级联四波混频所产生的信号光照片
图3是本发明光学参量啁啾脉冲放大种子光产生装置所获得的种子光的光谱示意图
图4是本发明光学参量啁啾脉冲放大种子光产生装置所获得种子光的角色散补偿前后对比图,(a)为角色散补偿以前的光谱特性,(b)为角色散补偿以后的光谱特性
具体实施方式
下面结合附图对本发明做进一步的说明,但是不应以此限制本发明的保护范围。
如图1所示,本发明光学参量啁啾脉冲放大种子光产生装置,构成包括:从钛宝石放大器出射的单脉冲能量为10mJ脉宽25fs的入射光入射到焦距1000mm 的第一柱面透镜1,然后经过截止频率800nm双色镜2进行分束,而所述的双色镜2把激光脉冲分为反射光和透射光,所述的反射光经过第一反射镜3、第二反射镜4、第三反射镜5后,入射到厚度0.5mm的aBBO9上,所述的第一反射镜3和第二反射镜4位于一个移动平台6上,用于调节所述透射光和所述反射光的时间同步;所述的透射光经过第四反射镜7,第五反射镜8反射后也入射到所述0.5mm的aBBO9上。调节两束入射光以空气中1.8°交叉角度在0.5mm的aBBO 9中时间空间重合,就可以在入射光的两侧看到多个彩色光斑的产生,如图2所示,这些就是基于级联四波混频获得的多色飞秒激光信号光,使用光纤光谱仪测量一级频率下转换信号光的光谱如图3所示,他的宽度覆盖了770nm到1000nm,已经覆盖KDP晶体的增益光谱范围;由于所述一级频率下转换信号光是经过非共线非线性过程产生,因而带有角色散;需要继续使用一枚焦距200mm的第二柱面镜10把所述一级频率下转换信号光成像到一枚三角棱镜11之上进行角色散补偿,在使用所述三角棱镜11进行角色散补偿前后,分别使用光纤光谱仪测量所述一级频率下转换信号光的光斑内部不同点光谱情况,测量结果对比图如图4所示,可见角色散补偿前,所述一级频率下转换信号光有明显的角色散,但是经过角色散补偿之后,补偿效果很明显。该实验装置经济简单,调节方便,在光学参量啁啾脉冲放大高能量拍瓦激光领域有着重要应用潜力。

Claims (3)

1.一种光学参量啁啾脉冲放大种子光产生装置,特征在于其构成包括:第一聚焦元件(1)、双色镜(2)、置于平移台(6)上的第一反射镜(3)和第二反射镜(4)、第三反射镜(5)、第四反射镜(7)、第五反射镜(8)、三阶非线性薄片(9)、第二聚焦元件(10)、角色散补偿元件(11)和第三聚焦元件(12);
入射光经第一聚焦元件(1)入射到双色镜(2),经该双色镜(2)分为反射光和透射光,所述的反射光依次经第一反射镜(3)、第二反射镜(4)和第三反射镜(5)反射后,聚焦到所述的三阶非线性薄片(9)中;所述的透射光依次经所述的第四反射镜(7)和第五反射镜(8)反射后,也聚焦于所述三阶非线性薄片(9)中;通过级联四波混频的作用在所述三阶非线性薄片(9)中产生频率转移的信号光,该信号光经过第二聚焦元件(10)成像到角色散补偿元件(11)中进行角色散补偿后,通过第三聚焦元件(12)准直输出。
2.根据权利要求1所述的光学参量啁啾脉冲放大种子光产生装置,其特征在于所述的角色散补偿(11)为棱镜或者光栅.
3.根据权利要求1所述的光学参量啁啾脉冲放大种子光产生装置,其特征在于所述的频率转移的信号光是基于级联四波混频过程产生,是三阶非线性过程的产物,其时间对比度是入射光的三次方。
CN201910011936.7A 2019-01-07 2019-01-07 光学参量啁啾脉冲放大种子光产生装置 Pending CN109494561A (zh)

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