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提出了一种采用倾斜脉冲的级联二阶非线性来实现超短激光脉冲压缩的方法. 对基于单块BBO晶体中基频光与倍频光群速度匹配的级联二阶非线性的脉冲压缩方案进行了理论分析. 对比研究了群速度匹配与失配情况下利用级联二阶非线性进行脉冲压缩的效果, 并模拟分析了基频光与倍频光的位相失配量、非线性晶体长度、 基频光初始峰值光强和初始脉宽等因素对脉冲压缩效果的影响. 结果表明, 基频光与倍频光的群速度匹配将会大幅度改善压缩脉冲的时间波形和频谱分布. 通过对位相失配量、晶体长度、初始光强等参数的优化和选取可获得较理想的压缩效果. 采用倾斜脉冲的级联二阶非线性的脉宽压缩方法, 针对中心波长800 nm、脉宽100 fs, 峰值光强为50 GW/cm2的基频光脉冲, 采用25 mm厚BBO晶体, 当基频光与倍频光位相失配量Δk=60 mm-1(对应失谐角1.98°), 晶体外部脉冲前沿倾斜角γ0=74°时, 计算获得了质量较好的20 fs剩余基频光, 并同时产生了14 fs的倍频光.A new method for compressing ultra-short laser pulse has been proposed in which cascaded quadratic nonlinearity with tilt pulse is used. The pulse compression scheme with group velocity matching between fundamental harmonic (FH) and second harmonic (SH) pulses in a single BBO crystal has been analyzed theoretically. The compressed results have been investigated and compared between the cases of group velocity matching and mismatching. Furthermore, the influences of the phase mismatching between the FH and SH pulses, the length of the nonlinear crystal, the initial peak intensity and pulse-duration of the FH pulse on the pulse-duration compression have been analyzed and simulated. The results show that the matched group velocity between FH and SH pulses can improve significantly both the temporal profile and the spectrum distribution of the compressed pulse. High quality compression can be achieved by optimizing and selecting the parameters such as phase mismatch, length of the nonlinear crystal, initial intensity and so on. For the fundamental pulse with 800 nm central wavelength, 100 fs duration and 50 GW/cm2 peak intensity, the 20fs output FH pulse has been achieved, and at the same time the 14 fs SH pulse has also been generated in 25 mm-long BBO crystal with Δk=60 mm-1 (1.98° detuning angle) and external tilt angle γ0=74°.
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Keywords:
- tilt pulse /
- cascaded quadratic nonlinearity /
- group velocity mismatch /
- pulse compression
[1] Zhu Y, Chen X W, Leng Y X, Liu J, Lin L H, Li R X, Xu Z Z 2005 Chin. J. Lasers 32 1614 (in Chinese) [朱毅, 陈晓伟, 冷雨欣, 刘军, 林礼煌, 李儒新, 徐至展 2005 中国激光 32 1614]
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[10] Dubietis A, Valiulis G, Danielius R, Piskarskas A 1996 Opt. Lett. 21 1262
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[14] Sidick E, Knoesen A, Dienes A 1995 J. Opt. Soc. Am. B 12 1704
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[16] Weiner A M 1983 IEEE J. Quantum Electron. 19 1276
[17] Szatmari S, Nagy T, Simon P, Feuerhake M 1996 Proceedings of the Ninth International Conference on Ultrafast Processes in Spectroscopy Plenum, New York, p621
[18] Diels J C, Rudolph W 2006 Ultrashort Laser Pulse Phenomena (2nd Ed) (Elsevier Press) p185
[19] Dubietis A, Valiulis G, Tamosauskas G, Danielius R, Piskarskas A 1997 Opt. Lett. 22 1071
[20] DeSalvo R, Hagan D J, Sheik-Bahae M, Stegeman G, Van Stryland E W, Vanherzeele H 1992 Opt Lett. 17 28
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[1] Zhu Y, Chen X W, Leng Y X, Liu J, Lin L H, Li R X, Xu Z Z 2005 Chin. J. Lasers 32 1614 (in Chinese) [朱毅, 陈晓伟, 冷雨欣, 刘军, 林礼煌, 李儒新, 徐至展 2005 中国激光 32 1614]
[2] Agrawal G P (Write), Jia D F, Yu Z H (Trans) 2010 Nonlinear Fiber Optics {& Application of Nonlinear Fiber Optic} (2nd Ed) (Beijing: Publishing House of Electronics Industry) p562 (in Chinese) [阿戈沃(著), 贾东方, 余震虹(译) 2010 非线性光纤光学原理及应用(第二版) (北京: 电子工业出版社) 第562页]
[3] Jin Y X, Zhao Y A, Shao J D, Fan Z X, Liu S J, Ma J Y, Shen Z C, Kong W J, Shen J 2007 Acta Phy. Sin. 564542 (in Chinese) [晋云霞, 赵元安, 邵建达, 范正修, 刘世杰, 麻健勇, 沈自才, 孔伟金, 沈健 2007 物理学报 56 4542]
[4] Hauri C P, Kornelis W, Helbing F W, Heinrich A, Couairon A, Mysyrowicz A, Bieger J, Keller U 2004 Appl. Phys. B 79 673
[5] Mevel E, Tcherbakoff O, Salin E, Constant E 2003 J. Opt. Soc. Am. B 20 105
[6] Xu F, Liu J S, Li R X, Xu Z Z 2007 Chin. Opt. Lett. 5 490
[7] Guo L W, Zhou C H 2006 Opt. Commun. 257 180
[8] Chen X W, Zhu Y, Liu J, Leng Y X, Ge X C, Li R X, Xu Z Z 2005 Acta Phy. Sin. 545178 (in Chinese) [陈晓伟, 朱毅, 刘军, 冷雨欣, 葛晓春, 李儒新, 徐至展 2005 物理学报 54 5178]
[9] Liu X, Qian L J, Wise F 1999 Opt. Lett. 24 1777
[10] Dubietis A, Valiulis G, Danielius R, Piskarskas A 1996 Opt. Lett. 21 1262
[11] Liu H J, Chen G F, Zhao W, Wang Y S, Cheng Z 2003 Acta Optica Sinica 23 11 (in Chinese) [刘红军, 陈国夫, 赵卫, 王屹山, 程昭 2003 光学学报 23 11]
[12] Wang K, Qian L J, Zhu H Y 2008 Chinese Science Bulletin 53 45 (in Chinese) [王科, 钱列, 朱鹤元 2008 科学通报 53 45]
[13] Morten B, Wise F W 2010 Phys. Rev. A 81 053815
[14] Sidick E, Knoesen A, Dienes A 1995 J. Opt. Soc. Am. B 12 1704
[15] Sidick E, Knoesen A, Dienes A 1994 Opt. Lett. 19 266
[16] Weiner A M 1983 IEEE J. Quantum Electron. 19 1276
[17] Szatmari S, Nagy T, Simon P, Feuerhake M 1996 Proceedings of the Ninth International Conference on Ultrafast Processes in Spectroscopy Plenum, New York, p621
[18] Diels J C, Rudolph W 2006 Ultrashort Laser Pulse Phenomena (2nd Ed) (Elsevier Press) p185
[19] Dubietis A, Valiulis G, Tamosauskas G, Danielius R, Piskarskas A 1997 Opt. Lett. 22 1071
[20] DeSalvo R, Hagan D J, Sheik-Bahae M, Stegeman G, Van Stryland E W, Vanherzeele H 1992 Opt Lett. 17 28
[21] Zhang Z G 2011 Femtosecond Laser technology (1st Ed) (Beijing: Science Press.) p7 (in Chinese) [张志刚 2011 飞秒激光技术(第一版) (北京: 科学出版社) 第7页]
[22] Ashihara S, Nishina J, Shimura T, Kuroda K 2002 J. Opt. Soc. Am. B 19 2505
[23] Hache F, Zeboulon A, Gallot G, Gale G M 1995 Opt. Lett. 20 1556
[24] Albert O, Etchepare J 1998 Opt. Commu. 154 345
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