举个例子：米宽光学望远镜要接收可见光波，其宽度就要大于所接受光波波长的数百万倍。
To illustrate: A meter-wide visible light telescope is a couple of million times wider than the wavelength of light it gathers.
分析和数值模拟了用瞬态简并四波混频实现光学啁啾反转的器件的主要参数对恢复信号波形和脉冲宽度能力的影响。
The influence of the principal parameters of optical chirp reversal devices on ability to restore signal wave form and pulse duration has been analysed and simulated.
方法利用矩阵光学方法，推导了高斯光束经耦合系统聚焦后束腰宽度和像距的计算公式。
Methods By the matrix optical method, formulae of waist width and imaging distance of focused Gaussian beams through the coupling system are derived.
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