Adiabatic compression of quadratic temporal solitons in aperiodic quasi-phase-matching gratings.
Adiabatic compression of quadratic temporal solitons in aperiodic quasi-phase-matching gratings.
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DOI：
10.1364/oe.14.009358
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发表时间：
2006-10
期刊：
影响因子：
3.8
通讯作者：
Xianglong Zeng;S. Ashihara;N. Fujioka;T. Shimura;K. Kuroda
中科院分区：
文献类型：
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作者：
Xianglong Zeng;S. Ashihara;N. Fujioka;T. Shimura;K. Kuroda
数值计算表明，在非周期极化的飞秒二次孤子器件中实现飞秒二次孤子绝热压缩是可能的。利用准相位匹配（QPM）器件中的群速度匹配方法，可以对基频波长为1560 nm的双色孤子进行几何整形。我们研究了基于两种不同群速度匹配方案的绝热压缩性能：I型（e：o + o）共线QPM几何和0型（e：e + e）非共线QPM几何。利用100 fs的基频光脉冲产生了脉宽为35 fs的双色时间孤子，且没有可见光。我们还发现，在小的群速度失配条件下，脉冲宽度较短的步行孤子被激发。在压缩过程中，行走孤子经历减速或加速，这取决于群速度失配的符号.实验结果表明，绝热脉冲整形技术可用于产生时间轮廓清晰的短脉冲、高效的飞秒谐波产生和群速度控制。
We numerically show that it is possible to achieve adiabatic compression of femtosecond quadratic solitons in aperiodically poled lithium niobate device. Two-colored solitons of the fundamental wavelength of 1560 nm can be adiabatically shaped by using group-velocity matching schemes available in quasi-phase-matching (QPM) devices. We investigate the performance of the adiabatic compression based on two different group-velocity matching schemes: type-I (e: o + o) collinear QPM geometry and type-0 (e: e + e) non-collinear QPM geometry. Two-colored temporal solitons with pulse duration of 35 fs are generated without visible pedestals from 100-fs fundamental pulse. We also show that walking solitons with shorter pulse durations are adiabatically excited under small group-velocity mismatch condition. The walking solitons experience deceleration or acceleration during compression, depending on the sign of the groupvelocity- mismatch. The demonstrated adiabatic pulse shaping is useful for generation of shorter pulses with clean temporal profiles, efficient femtosecond second harmonic generation and group-velocity control.