Magnetostatic-Wave-Based Magneto-Optic Pulse Compression by Control of Phase Mismatching
Magnetostatic-Wave-Based Magneto-Optic Pulse Compression by Control of Phase Mismatching
复制标题
DOI：
10.1088/0256-307x/25/11/046
复制
发表时间：
2008-11
影响因子：
3.5
通讯作者：
W. Bao-jian;G. Xiang
中科院分区：
文献类型：
--
作者：
W. Bao-jian;G. Xiang
微波静磁波作为磁光膜中的移动光栅，可引起导光波的布拉格衍射。MO耦合特性决定了衍射脉冲的幅相频谱，甚至导致啁啾光脉冲在时域的压缩。从理论上详细研究了连续静磁正向体波对线性啁啾高斯光脉冲的非线性共线衍射。对于给定的啁啾光脉冲，随着相位错配斜率的增大，压缩效率逐渐提高到最大值，随后衍射脉冲从单峰向多峰转变。啁啾参数越大，实现最大CE所需的相位不匹配斜率越小。然而，啁啾参数或相位不匹配斜率的上升会降低衍射脉冲的相对峰值强度。最后指出，采用高阶模态可以大大增加相错配斜率。
Microwave magnetostatic waves (MSWs) as moving gratings in magneto-optic (MO) film can lead to the Bragg diffraction of guided optical waves (GOWs). The MO coupling characteristics are responsible for the amplitude and phase frequency spectra of diffracted pulses and even result in the compression of chirped optical pulses in time domain. We theoretically investigate the noncollinear diffraction of linearly chirped Gaussian optical pulses by continuous magnetostatic forward volume waves in detail. For a given chirped optical pulse, with the increase of phase-mismatching slopes, the compression efficiency (CE) is gradually improved up to the maximum followed by the transition of diffracted pulses from single peak to multi peaks. The larger the chirp parameter is, the smaller the required phase-mismatching slope to achieve the maximal CE is. However, the rise of the chirp parameter or phase-mismatching slope reduces the relative peak intensity of the diffracted pulse. Lastly, it is pointed out that the phase-mismatching slope can be greatly increased by using the high-order modes of MSWs and GOWs.