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提出一种新的可以较好地描写带有相位台阶光学谐振腔的模式的光束模型－余弦－高斯光束．这种光束是由两束高斯球面波的相干叠加形成的，其光束质量因子可以小于１
A new type of cosine-Gaussian beam, which can describe the mode with phase-step optical resonator well, is proposed. This beam is formed by the coherent addition of two Gaussian spherical waves with a beam quality factor of less than one