Nd, Gd:SrF<sub>2</sub>晶体材料在宽带放大中的光谱增益特性

蒋东镔; 张颖; 姜大朋; 朱斌; 李纲; 孙立; 黄征; 卢峰; 谢娜; 周凯南; 粟敬钦

doi:10.7498/aps.72.20230972

摘要

光谱的增益窄化是影响超短脉冲宽带放大的关键因素之一. 本文利用Nd, Gd:SrF₂晶体发射光谱的特点, 开展了宽带放大中的光谱增益特性理论和实验的研究. 通过数值模拟, 详细研究了激光增益介质在不同的光谱增益线型及不同增益倍数下, 输出光谱的演化规律. Nd, Gd:SrF₂晶体光谱增益窄化特性研究实验结果表明, 输入光谱半高宽为5 nm时, 在140倍的增益条件下, Nd, Gd:SrF₂晶体的输出光谱宽度未见明显窄化, 实验结果与理论计算分析相符合. 研究结果为氟化物晶体在宽带啁啾脉冲放大的应用奠定了基础.

关键词:

Abstract

Spectral gain narrowing is one of the key factors affecting broadband amplification of ultrashort pulses. In this paper, the spectral gain characteristics in broadband amplification are studied theoretically and experimentally by using the characteristic of Nd,Gd:SrF₂ crystal, i.e. the emission spectrum that has a certain width at the higher stimulated emission cross section. Through the numerical simulation, the evolution law of output spectrum of the laser gain medium under different spectral gain lineshapes and different gain values is studied in detail. Theoretical calculation shows that the spectral gain is narrowed obviously with the increase of gain value of the traditional Gaussian emission spectrum, and that increasing the spectral bandwidth at the maximum stimulated emission cross section can obviously suppress the spectral gain narrowing. Furthermore, the spectral gain narrowing characteristics of the Nd,Gd:SrF₂ crystal are studied experimentally. The Ф 13 mm× 150 mm Nd,Gd:SrF₂ crystals are used as the gain medium which are pumped by flash lamps in the experimental study. The experimental results show that the output spectra of Nd,Gd:SrF₂ crystals are not obviously narrowed when the full width at half maximum (FWHM) of spectral width of the input laser is 5 nm and the gain is 140 times. The experimental results are consistent with the theoretical calculation and analysis. The crystal can work normally at a repetition rate of 0.2 Hz and 1.0 Hz in the experiment, but due to the influence of thermal effect, the gain will decrease to a certain extent with the increase of pump energy and repetition rate. The research results lay the foundation for the application of fluoride crystal in broadband chirped pulse amplification.

Keywords:

作者及机构信息

1.
中国工程物理研究院激光聚变研究中心, 绵阳　621900

2.
中国科学院上海硅酸盐研究所, 上海　201899

通信作者: 周凯南, zhoukainan@caep.cn ; 粟敬钦, sujingqin@caep.cn

基金项目: 中国工程物理研究院等离子体物理重点实验室研究基金(批准号: ZY2020-06, 6142A04210104)和中国工程物理研究院创新发展基金(批准号: CX20200022)资助的课题.

Authors and contacts

1.
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

2.
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China

Corresponding author: Zhou Kai-Nan, zhoukainan@caep.cn ; Su Jing-Qin, sujingqin@caep.cn

Funds: Project supported by the Research Foundation of Science and Technology on Plasma Physics Laboratory, China Academy of Engineering Physics, China (Grant Nos. ZY2020-06, 6142A04210104) and the Innovation and Development Foundation of China Academy of Engineering Physics, China (Grant No. CX20200022).

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参考文献

[1]	Kuzmin A A, Khazanov E A, Shaykin A A 2011 Opt. Express 19 14223 Google Scholar
[2]	刘兰琴, 彭翰生, 魏晓峰, 曾小明, 彭志涛, 黄小军, 王晓东, 周凯南, 王逍, 朱启华, 楚晓亮, 郭仪 2005 强激光与粒子束 17 856 Liu L Q, Peng H S, Wei X F, Zeng X M, Peng Z T, Huang X J, Wang X D, Zhou K N, Wang X, Zhu Q H, Chu X L, Gou Y 2005 High Power Laser Part. Beams 17 856
[3]	刘兰琴, 彭翰生, 魏晓峰, 朱启华, 黄小军, 王晓东, 周凯南, 曾小明, 王逍, 郭仪, 袁晓东, 彭志涛, 唐晓东 2005 54 2764 Google Scholar Liu L Q, Peng H S, Wei X F, Zhu Q H, Huang X J, Wang X D, Zhou K N, Zeng X M, Wang X, Gou Y, Yuan X D, Peng Z T, Tang X D 2005 Acta Phys. Sin. 54 2764 Google Scholar
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[14]	Stephen A P, John A C, Chase L L, Smith L K, Nielsen N D, William F K 1991 J. Opt. Soc. Am. B 8 726 Google Scholar
[15]	Zhao S H, Wang Y S, Chen G F, Wang S H, Hou X 1997 Acta Photonica Sin. 26 197 (in chinese) [赵尚弘, 王屹山, 陈国夫, 王贤华, 侯洵 1997 光子学报 26 197 Zhao S H, Wang Y S, Chen G F, Wang S H, Hou X 1997 Acta Photonica Sin. 26 197 (in chinese)
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施引文献

图 1 模拟输入激光脉冲光谱分布

Fig. 1. Input laser spectrum of simulation.

下载: 全尺寸图片幻灯片

图 2 三种不同材料的发射光谱和不同增益下的输出脉冲光谱分布

Fig. 2. Emission spectrum of three different materials and their output spectrum with different gain.

下载: 全尺寸图片幻灯片

图 3 Nd, Gd:SrF₂晶体吸收光谱

Fig. 3. Absorption spectrum of the Nd, Gd:SrF₂ crystal.

下载: 全尺寸图片幻灯片

图 4 Nd, Gd: SrF₂晶体发射光谱

Fig. 4. Emission spectrum of the Nd, Gd:SrF₂ crystal.

下载: 全尺寸图片幻灯片

图 5 测试光路示意图. FR, 法拉第; SF, 空间滤波器; AMP, 放大器; CM, 腔镜

Fig. 5. Layout of experiment. FR, faraday; SF, spatial filter; AMP, amplifier; CM, cavity mirror

下载: 全尺寸图片幻灯片

图 6 不同增益光谱为5 nm (FWHM)时输入输出图

Fig. 6. Input and output diagram with the different gain spectra of 5 nm (FWHM).

下载: 全尺寸图片幻灯片

图 7 增益与泵浦电压的关系

Fig. 7. Gain changing with different pump voltage.

下载: 全尺寸图片幻灯片

map

[1]	Kuzmin A A, Khazanov E A, Shaykin A A 2011 Opt. Express 19 14223 Google Scholar
[2]	刘兰琴, 彭翰生, 魏晓峰, 曾小明, 彭志涛, 黄小军, 王晓东, 周凯南, 王逍, 朱启华, 楚晓亮, 郭仪 2005 强激光与粒子束 17 856 Liu L Q, Peng H S, Wei X F, Zeng X M, Peng Z T, Huang X J, Wang X D, Zhou K N, Wang X, Zhu Q H, Chu X L, Gou Y 2005 High Power Laser Part. Beams 17 856
[3]	刘兰琴, 彭翰生, 魏晓峰, 朱启华, 黄小军, 王晓东, 周凯南, 曾小明, 王逍, 郭仪, 袁晓东, 彭志涛, 唐晓东 2005 54 2764 Google Scholar Liu L Q, Peng H S, Wei X F, Zhu Q H, Huang X J, Wang X D, Zhou K N, Zeng X M, Wang X, Gou Y, Yuan X D, Peng Z T, Tang X D 2005 Acta Phys. Sin. 54 2764 Google Scholar
[4]	贺晓旭, 白晋涛, 侯洵 2001 光子学报 30 957 He X X, Bai J T, Hou X 2001 Acta Photonica Sin. 30 957
[5]	曹东茂, 魏志义, 滕浩, 夏江帆, 张杰, 侯洵 2000 49 1202 Google Scholar Cao D M, Wei Z Y, Teng H, Xia J F, Zhang J, Hou X 2000 Acta Phys. Sin. 49 1202 Google Scholar
[6]	Gaul E W, Martinez M, Blakeney J, Jochmann A, Ringuette M, Hammond D, Borger T, Escamilla R, Douglas S, Henderson W, Dyer G, Erlandson A, Cross R, Caird J, Ebbers C, Ditmire T 2010 Appl. Opt. 49 1676 Google Scholar
[7]	Su L B, Wang Q G, Li H J, Brasse G, Camy P, Doualan J L, Braud A, Moncorge R, Zhan Y Y, Zheng L H, Qian X B, Xu J 2013 Laser Phys. Lett. 10 035804 Google Scholar
[8]	Jiang D P, Zhan Y Y, Zhang Q, Ma F K, Su L B, Tang F, Qian X B, Xu J 2015 Cryst. Eng. Comm. 17 7398 Google Scholar
[9]	Qin Z P, Xie G Q, Ma J, Ge W Y, Yuan P, Qian L J, Su L B, Jiang D P, Ma F K, Zhang Q, Cao Y X, Xu J 2014 Opt. Lett. 39 1737 Google Scholar
[10]	唐熊忻, 邱基斯, 樊仲维, 王昊成, 刘悦亮, 刘昊, 苏良碧 2016 65 204206 Google Scholar Tang X X, Qiu J S, Fan Z W, Wang H C, Liu Y L, Liu H, Su L B 2016 Acta Phys. Sin. 65 204206 Google Scholar
[11]	Tang X X, Qiu J S, Fan Z W, Su L B, Wang H C 2016 Opt. Mater. 58 445 Google Scholar
[12]	张菊婷, 朱江峰, 王军利, 魏志义, 苏良碧, 徐军 2016 光子学报 45 0114001 Google Scholar Zhang J T, Zhu J F, Wang J L, Wei Z Y, Su L B, Xu J 2016 Acta Photonica Sin. 45 0114001 Google Scholar
[13]	Doualan J L, Su L B, Brasse G, Benayad A, Menard V, Zhan Y Y, Braud A, Camy P, Xu J, Moncorge R 2013 J. Opt. Soc. Am. B 30 3018 Google Scholar
[14]	Stephen A P, John A C, Chase L L, Smith L K, Nielsen N D, William F K 1991 J. Opt. Soc. Am. B 8 726 Google Scholar
[15]	Zhao S H, Wang Y S, Chen G F, Wang S H, Hou X 1997 Acta Photonica Sin. 26 197 (in chinese) [赵尚弘, 王屹山, 陈国夫, 王贤华, 侯洵 1997 光子学报 26 197 Zhao S H, Wang Y S, Chen G F, Wang S H, Hou X 1997 Acta Photonica Sin. 26 197 (in chinese)
[16]	刘兰琴, 粟敬钦, 罗斌, 王文义, 景峰, 魏晓峰 2007 56 6749 Google Scholar Liu L Q, Su J Q, Luo B, Wang W Y, Jing F, Wei X F 2007 Acta Phys. Sin. 56 6749 Google Scholar
[17]	Chen J C, Peng Y J, Zhang Z X, Su H P, Leng Y X, Jiang D P, Ma F K, Qian X B, Tang F, Su L B 2017 Opt. Commun. 382 201 Google Scholar
[18]	Assmann R W, Weikum M K 2020 Eur. Phys. J. Special Topics 229 3675 Google Scholar

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Nd, Gd:SrF₂晶体材料在宽带放大中的光谱增益特性