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光参量啁啾脉冲放大(OPCPA)是超短激光脉冲领域的重要技术之一, 增大增益带宽对提高OPCPA的转换效率、实现宽带光参量放大具有重要的意义. 本文将光束偏转和非共线OPCPA有机结合, 提出了基于光束偏转的扫描式宽带OPCPA模型. 分析了通过光束偏转来时刻改变非共线角, 以保证各频率成分的相位匹配, 从而增大增益带宽的基本原理. 采用提出的扫描式宽带OPCPA, 针对800 nm中心波长、带宽约为100 nm信号光的光参量放大进行了数值计算. 结果表明: 经过扫描式OPCPA后, 信号光的带宽与放大之前几乎相同, 光谱没有窄化; 扫描式OPCPA比固定非共线角方式的放大极大地增加了增益带宽和转换效率, 实现了宽带的光参量放大; 要满足信号光各频率成分的相位匹配, 达到最大的增益带宽和转换效率, 需要尽量减小加载到钽铌酸钾(KTa1−xNbxO3, KTN)电光晶体上的电压抖动和电压延时.One of the goals pursued in laser pulse is to achieve a laser with a shorter duration and higher intensity. In the past two decades, the laser pulse duration has been shortened by more than 7 orders of magnitude due to the development of Q-switched, Mode-locked and pulse compression technology. The peak power of laser pulse has been increased to PW, even EW and ZW from initial MW with the development of pulse amplification technology, whose focused intensity can reach to 1023 W/cm2. Thus, it provides unprecedented extreme conditions, and speeds up the laser applications in ultrafast nonlinear optics, strong field physics, fast ignition of laser nuclear fusion, optic communication, etc. The optical parametric chirped pulse amplification (OPCPA) is one of the important technologies in ultra-short laser pulse field. It is of great significance to increase the gain bandwidth for improving the conversion efficiency of OPCPA and achieving broadband optical parametric amplification. Combining the optical beam deflection and non-collinear OPCPA, a novel scanning broadband OPCPA model is proposed based on the optical beam deflection. The basic principle of increasing the gain bandwidth for the scanning broadband OPCPA is analyzed theoretically, which ensures the phase matching of each frequency component of signal by optical beam deflecting to change the non-collinear angle constantly. Namely, the non-collinear angles of incident frequency components of signal are different from each other, which, however, makes the whole phase matching of signal, i.e. momentum conservation in optics. The optical parametric amplification of signal pulse with 800 nm central wavelength and almost 100 nm bandwidth is simulated numerically by the proposed scanning broadband OPCPA. The results show that the bandwidth after being amplified is almost the same as before and there is no spectral narrowing, and the scanning broadband OPCPA increases the gain bandwidth and conversion efficiency greatly compared with the amplification with a constant given non-collinear angle, which leads to broadband optical parametric amplification. Finally, it is necessary to make sure that the on-load voltage to the KTN crystal matches with the frequency of signal pulse in time and reduces the unfavorable voltage deviation and time-delay for the maximizing gain bandwidth and conversion efficiency and ensuring the phase matching of each signal frequency component. The results of this paper not only provide an approach to increasing the gain bandwidth of OPCPA, but also supply some theoretical references and the basis for the experimental work of OPCPA in ultra-short laser pulse system.
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Keywords:
- optical parametric chirped pulse amplification /
- optical beam deflection /
- scanning /
- broadband
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图 1 相位失配量随相位匹配角和信号光波长的等高线分布
Fig. 1. Contour plot of phase-mismatching, signal wavelength, and phase-matching angle.
图 2 相位失配量随非共线角增量和信号光波长的等高线分布
Fig. 2. Contour plot of phase-mismatching, signal wavelength, and increment of non-collinear angle.
图 3 满足相位匹配的非共线角随信号波长的变化
Fig. 3. Variation of non-collinear angle with signal wavelength under phase matching.
图 4 扫描式光参量啁啾脉冲放大示意图, 内插图为相位匹配几何关系
Fig. 4. Schematic drawing of scanning OPCPA, and the inset is the geometry of phase matching.
图 5 不同方式放大后信号光的时域波形和频谱分布对比 (a)时域波形; (b)频谱分布
Fig. 5. Comparison of time domain waveform and frequency spectrum with different amplification: (a) Time domain waveform; (b) frequency spectrum.
图 6 光束偏转产生非共线角增量所需要的电压和相位失配量随信号波长的变化 (a) 需要的电压; (b) 相位失配量的变化
Fig. 6. The required voltage for Non-collinear angular increments by optical beam deflection and the variation of phase-mismatching with signal wavelength: (a) Required voltage; (b) variation of phase-mismatching.
图 7 电压抖动对扫描式OPCPA放大后信号脉冲的影响 (a) 时域波形; (b) 频谱分布; (c) 带宽
Fig. 7. Effect of voltage deviation on signal pulse after scanning OPCPA: (a) Time domain waveform; (b) frequency spectrum; (c) bandwidth.
图 8 扫描式宽带OPCPA转换效率随电压抖动和电压延时 (a) 电压抖动; (b) 电压延时
Fig. 8. Variation of conversion efficiency with voltage deviations and voltage time-delay for scanning broadband OPCPA: (a) Voltage deviation; (b) voltage time-delay.
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[1] Chini M, Zhao K, Chang Z 2014 Nat. Photonics 8 79
[2] 魏志义 2014 超快光学研究前沿 (上海: 上海交通大学出版社) 第10−15页
Wei Z Y 2014 Advances in Ultrafast Optics (Shanghai: Shanghai Jiaotong University Press) pp10−15 (in Chinese)
[3] Peter S, Vincent T, Arthur Z, Tamas R, Matthias R, Philipp M, Thomas W 2016 Phys. Rev. Lett. 116 1
[4] Seuthe T, Mermillod-blondin A, Grehn M, Bonse J, Wondraczek L, Eberstein M 2017 Sci. Rep. 7 43815
Google Scholar
[5] Shiraga H, Nagatomo H, Theobald W, Thebald W, Solodov A A, Tabak M 2014 Nucl. Fusion 54 1464
[6] 陈险峰 2014 非线性光学研究前沿 (上海: 上海交通大学出版社) 第1−6页
Chen X F 2014 Advances in Nonlinear Optics (Shanghai: Shanghai Jiaotong University Press) pp1−6 (in Chinese)
[7] Strickland D, Mourou G 1985 Opt. Commun. 55 447
Google Scholar
[8] Pittman M, Ferre S, Rousseau J R, Chambaret J P, Cheriaux G 2002 Appl. Phy. B 74 529
[9] Sung J H, Lee H W, Yoo J Y, Yoon J W, Lee C W, Yang J M, Son Y J, Jang Y H, Lee S K, Nam C H 2017 Opt. Lett. 42 2058
Google Scholar
[10] Dubietis A, Jonusauskas G, Piskarskas A 1992 Opt. Commun. 88 437
Google Scholar
[11] Bagnoud V, Begishev I A, Guardalben M J, Puth J, Zuegel J 2005 Opt. Lett. 30 1843
Google Scholar
[12] Miyanaga N, Kawanaka J 2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Sydeney, August 28−September 1, 2011 p794
[13] Hugonnot E, Luce J, Coic H 2006 Appl. Opt. 45 377
Google Scholar
[14] Yan S S, Liu D Z, Kong X, Ouyang X P, Zhu B Q, Zhu J Q 2018 Fusion Eng. Des. 132 18
Google Scholar
[15] Driscoll T J, Gale G M, Hache F 1994 Opt. Commun. 110 638
Google Scholar
[16] Gale G M, Cavallari M, Driscoll T J, Hache F 1995 Opt. Lett. 20 1562
Google Scholar
[17] 夏江帆, 魏志义, 张杰 2000 49 256
Google Scholar
Xia J F, Wei Z Y, Zhang J 2000 Acta Phys. Sin. 49 256
Google Scholar
[18] 马晶, 章若冰, 刘博, 朱晨, 张伟力, 张志刚, 王清月 2005 54 4765
Google Scholar
Ma J, Zhang R B, Liu B, Zhu C, Zhang W L, Zhang Z G, Wang Q Y 2005 Acta Phys. Sin. 54 4765
Google Scholar
[19] Arisholm G, Biegert J, Schlup P, Hauri C P, Keller U 2004 Opt. Express 12 518
Google Scholar
[20] Wang C, Leng Y, Liang X, Liang X Y, Zhao B Z, Xu Z Z 2005 Opt. Commun. 246 323
Google Scholar
[21] Wang C, Leng Y X, Zhao B Z, Zhang Z Q, Xu Z Z 2004 Opt. Commun. 237 169
Google Scholar
[22] 刘华刚, 章若冰, 张海清, 朱晨, 马晶, 王清月 2007 56 4635
Google Scholar
Liu H G, Zhang R B, Zhang H Q, Zhu C, Ma J, Wang Q Y 2007 Acta Phys. Sin. 56 4635
Google Scholar
[23] 刘华刚, 章若冰, 朱晨, 柴路, 王清月 2008 57 2981
Google Scholar
Liu H G, Zhang R B, Zhu C, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 2981
Google Scholar
[24] Frantisek B, Roman A, Jakub N, Jonathan T G, Jack A N, Jakub H, Martin H, Zbynek H, Robert B, Tomas M, Bedrich H, Pavel B, Bedrich R 2016 Opt. Express 24 17843
Google Scholar
[25] Naganuma K, Miyazu J, Yagi S 2009 NTT Tech. Rev. 7 1
[26] Gong D W, Wu Y, Liang Y G, Ou W J, Wang J J, Liu B, Zhou Z X 2015 Laser Phys. 25 056102
Google Scholar
[27] Gong D W, Liang Y G, Ou W J, Wang J J, Wu Y, Liu B, Zhou Z X 2016 Mater. Res. Bull. 75 7
Google Scholar
[28] Chao J H, Zhu W B, Wang C, Yao J M, Yin S, Hoffman R C 2015 Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IX, SPIE 9586 p1
[29] Zhu W B, Chao J H, Chen C J, Yin S Z, Hoffman R C 2016 Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X, SPIE 9958 p1
[30] Koichiro N, Jun M, Masahiro S, Kazuo F 2006 Appl. Phys. Lett. 89 388
[31] Grace E J, Tsangarts C L, New G H C 2006 Opt. Commun. 261 225
Google Scholar
[32] Liu H, Liu B Y, Bai Y L, Ouyang X, Gou Y S, Zheng J K 2011 Chin. J. Opt. 4 60
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