cw laser 基本例句 连续波激光器 The diffraction modulation of ultrashort pulsed- laser is less than that of CW laser, so only serrated aperture can be used to get uniform near-field uniform intensity distribution. 和单色激光的衍射不同，宽带的飞秒光束衍射调制较小，直接利用锯齿光阑，便能获得近场光强分布相对均匀的光束。 cnki