减小光栅的模式耦合系数可以增大耦合效率和提高光栅反射率。
The couple efficiency and the reflecting rate increase with the decrease of the mode couple coefficient.
耦合系数包括偏振耦合项和双折射耦合项。并用马卡提里近似下的模式作为零级近似。
The polarization coupling term and birefringence coupling term are included in the coupling coefficient expression.
实验结果表明，在大气呼吸模式激光推进中，空气的击穿阈值随激光波长的增大而降低，激光波长对飞行器获得的冲量耦合系数没有明显的影响。
The results show that the threshold of air breakdown decreases when laser wavelength increases, while the wavelength has no evident effect on the momentum coupling coefficient.
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