RAMAN EFFECT IN ALGAAS WAVEGUIDES FOR SUBPICOSECOND PULSES
RAMAN EFFECT IN ALGAAS WAVEGUIDES FOR SUBPICOSECOND PULSES
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亚皮秒脉冲藻类波导中的拉曼效应
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
W. Hobson
中科院分区：
文献类型：
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作者：
Y. Kao;M. Islam;J. Saylor;R. Slusher;W. Hobson
对半禁带以下半导体波导中的拉曼效应进行了实验研究和数值模拟。本文报道了在泵浦波长为0.515 μ m和1.55 μm时，用GaAs作参考散射体测量的Al 0.24 Ga 0.76 As的绝对拉曼散射截面的解偏振拉曼增益谱，其最大值可达300 cm-1。此外，AlGaAs波导的耦合传输方程进行了修改，以包括拉曼效应。通过数值求解耦合传播方程，我们验证了之前的抽运-探测实验中所证明的两个正交偏振脉冲之间的能量转移[M. N. Islam等人，J. Appl.Phys.71，1927（1992）]是由拉曼效应引起的。数值计算还表明，拉曼效应引起的光谱畸变的脉冲，和能量转移是成反比的脉冲宽度。能量转移导致AlGaAs波导中亚皮秒脉冲的严重串扰问题。例如，能量交换是关于…
The Raman effect in semiconductor waveguides below half‐gap is studied both experimentally and numerically. We report the depolarized Raman gain spectra up to 300 cm−1 in Al0.24Ga0.76As at pump wavelengths of 0.515 and 1.55 μm from the measurement of the absolute Raman scattering cross sections using GaAs as a reference scatterer. In addition, the coupled propagation equations for the AlGaAs waveguides are modified to include the Raman effect. By solving the coupled propagation equations numerically, we verify that the energy transfer between two orthogonally polarized pulses demonstrated in previous pump‐probe experiments [M. N. Islam et al., J. Appl. Phys. 71, 1927 (1992)] is caused by Raman effect. We also show numerically that the Raman effect induces spectral distortions on the pulses, and the energy transfer is inversely proportional to the pulse widths. The energy transfer results in a severe cross‐talk problem for sub‐picosecond pulses in AlGaAs waveguides. For example, the energy exchange is abou...