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报道了一种通过预先对信号光脉冲非线性整形, 进而在光纤放大器中实现自相似演化的方法. 利用透射光栅对和普通单模光纤组成被动脉冲整形装置, 预先优化脉冲的时域宽度和光谱质量, 使脉冲在光纤放大器中快速演化到自相似子. 研究中首先通过数值模拟对比, 说明了非线性整形对脉冲实现快速自相似放大的关键作用, 提高了放大器输出脉冲质量, 减小了去啁啾脉冲宽度. 实验中, 通过优化非线性整形输出, 在2.2 m 长的掺Yb3+光纤中, 在一定抽运功率范围内均实现了脉冲自相似放大, 去啁啾后得到脉冲宽度60 fs 的变换极限脉冲输出. 这种非线性脉冲预整形方法有效减小了 自相似演化所需光纤长度, 同时降低了自相似放大对种子源质量的要求, 首次将全正色散光纤锁模激光器成功用于自相似放大, 促进了当前自相似放大系统的全光纤化.A nonlinear pre-shaper which optimizes initial pulses for self-similar evolution in a following short fiber amplifier is demonstrated. It consists of a pair of transmission gratings and a segment of single mode fiber, by which pulses are shaped temporally and spectrally before amplification. To confirm the benefit of nonlinear pre-shaping for the self-similar evolution, pulse amplifications with and without the nonlinear pre-shaper are simulated. From comparison, pulses optimized by nonlinear pre-shaper show a shorter pulse duration, less pedestal and broader spectrum after amplification and compensation. With this optimization, the self-similar amplification can be realized in a 2.2-meter Yb3+-doped fiber in a large range of pump power, generating 60 fs transform-limited pulses after compression. This nonlinear pre-shaping method can efficiently shorten the fiber length and release the seed quality required for self-similar amplification. An all-normal dispersion mode-locked fiber laser is employed as the seed of a self-similar amplifier for the first time, thus facilitating an all-fiber system.
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Keywords:
- nonlinear pulse shaping /
- fiber amplifier /
- self-similar amplification /
- femtosecond laser
[1] Limpert J, Rser F, Schreiber T, Tnnermann A 2006 IEEE J. Sel. Top. Quantum Electron. 12 233
[2] Song Y J, Hu M L, Liu B W, Chai L, Wang Q Y, 2008 Acta Phys. Sin. 57 6425 (in Chinese) [宋有建, 胡明列, 刘博文, 柴路, 王清月 2008 57 6425]
[3] Liu B W, Hu M L, Song Y J, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 6921 (in Chinese) [刘博文, 胡明列, 宋有建, 柴路, 王清月 2008 57 6921]
[4] Deng Y, Chien C, Fidric G B, Kafka D J 2009 Opt. Lett. 34 3469
[5] Shah L, Liu Z, Hartl I, Imeshev G, Cho G, Fermann M 2005 Opt. Express 13 4717
[6] Zhou S, Kuznetsova L, Chong A, Wise F 2005 Opt. Express 13 4869
[7] Xie C, Liu B, Niu H, Song Y, Li Y, Hu M, Zhang Y, Shen W, Liu X, Wang C 2011 Opt. Lett. 36 4149
[8] Fermann E M, Kruglov I V, Thomsen C B, Dudley M J, Harvey D J 2000 Phys. Rev. Lett. 84 6010
[9] Kruglov I V, Peacock C A, Harvey D J, Dudley M J 2002 J. Opt. Soc. Am. B 19 461
[10] Chang Q G, Galvanauskas A, Winful G H, Norris B T 2004 Opt. Lett. 29 2647
[11] Paschotta R, Nilsson J, Tropper C A, Hanna C D 1997 IEEE J. Quantum Electron. 33 1049
[12] Finot C, Parmigiani F, Petropoulos P, Richardson J D 2006 Opt. Express 14 3161
[13] Finot C, Provost L, Petropoulos P, Richardson J D 2007 Opt. Express 15 852
[14] Oberthaler M, Hopfel A R 1993 Appl. Phys. Lett. 63 1017
[15] Zaouter Y, Papadopoulos N D, Hanna M, Druon F, Cormier E, Georges P 2007 Opt. Express 15 9372
[16] Fang X H, Hu M L, Song Y J, Xie C, Chai L, Wang Q Y 2011 Acta Phys. Sin. 60 064208 (in Chinese) [方晓惠, 胡明列, 宋有建, 谢辰, 柴路, 王清月 2011 60 064208]
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[1] Limpert J, Rser F, Schreiber T, Tnnermann A 2006 IEEE J. Sel. Top. Quantum Electron. 12 233
[2] Song Y J, Hu M L, Liu B W, Chai L, Wang Q Y, 2008 Acta Phys. Sin. 57 6425 (in Chinese) [宋有建, 胡明列, 刘博文, 柴路, 王清月 2008 57 6425]
[3] Liu B W, Hu M L, Song Y J, Chai L, Wang Q Y 2008 Acta Phys. Sin. 57 6921 (in Chinese) [刘博文, 胡明列, 宋有建, 柴路, 王清月 2008 57 6921]
[4] Deng Y, Chien C, Fidric G B, Kafka D J 2009 Opt. Lett. 34 3469
[5] Shah L, Liu Z, Hartl I, Imeshev G, Cho G, Fermann M 2005 Opt. Express 13 4717
[6] Zhou S, Kuznetsova L, Chong A, Wise F 2005 Opt. Express 13 4869
[7] Xie C, Liu B, Niu H, Song Y, Li Y, Hu M, Zhang Y, Shen W, Liu X, Wang C 2011 Opt. Lett. 36 4149
[8] Fermann E M, Kruglov I V, Thomsen C B, Dudley M J, Harvey D J 2000 Phys. Rev. Lett. 84 6010
[9] Kruglov I V, Peacock C A, Harvey D J, Dudley M J 2002 J. Opt. Soc. Am. B 19 461
[10] Chang Q G, Galvanauskas A, Winful G H, Norris B T 2004 Opt. Lett. 29 2647
[11] Paschotta R, Nilsson J, Tropper C A, Hanna C D 1997 IEEE J. Quantum Electron. 33 1049
[12] Finot C, Parmigiani F, Petropoulos P, Richardson J D 2006 Opt. Express 14 3161
[13] Finot C, Provost L, Petropoulos P, Richardson J D 2007 Opt. Express 15 852
[14] Oberthaler M, Hopfel A R 1993 Appl. Phys. Lett. 63 1017
[15] Zaouter Y, Papadopoulos N D, Hanna M, Druon F, Cormier E, Georges P 2007 Opt. Express 15 9372
[16] Fang X H, Hu M L, Song Y J, Xie C, Chai L, Wang Q Y 2011 Acta Phys. Sin. 60 064208 (in Chinese) [方晓惠, 胡明列, 宋有建, 谢辰, 柴路, 王清月 2011 60 064208]
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