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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.
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Keywords:
- broadband laser amplifier /
- gain narrowing /
- fluoride crystals /
- flash lamp pump
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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.
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
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).
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[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 物理学报 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 物理学报 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 物理学报 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 物理学报 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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