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在激光分离同位素、激光化学、激光导星（人造星）技术等领域，为了提高脉冲激光的利用效率，需将激光脉冲展宽。介绍了各种光学方法展宽激光脉冲的基本原理，并对由分光镜和反射镜组成的激光脉冲展宽器进行了具体的实验研究，这种展宽器被设计成将脉宽为２０～２５ｎｓ的染料激光脉宽展宽１倍左右。它把原始脉冲分成４个独立的子脉冲，每个子脉冲的幅值是原始脉冲的１／４，但时间序列相继延迟７～１０ｎｓ，然后通过合光镜把这些子脉冲首尾相接堆积成一个脉冲。实验结果表明，脉冲持续时间可增加２０～３０ｎｓ，在波长为５７０～６００ｎｓ的染料激光能量转换效率达８０％以上，对某些波长的能量转换效率甚至超过９０％。
In laser separation isotope, laser chemistry, laser guide star (artificial satellite) technology and other fields, in order to improve the utilization efficiency of pulsed laser, it is necessary to broaden the laser pulse. The basic principles of broadening the laser pulses by various optical methods are introduced. The experimental research on the laser pulse stretcher consisting of the dichroic mirrors and mirrors is carried out. The stretcher is designed to convert the pulse width of 20 ~ 25ns dye Laser pulse width of about 1 times. It divides the original pulse into four independent sub-pulses, each of which has a sub-pulse amplitude of 1/4 of the original one, but the time series is successively delayed by 7 to 10 ns, and then the sub-pulses are piled up one by one pulse. The experimental results show that the pulse duration can be increased by 20 ~ 30ns, the energy conversion efficiency of dye laser at wavelength of 570 ~ 600ns reaches more than 80%, and the energy conversion efficiency to some wavelengths even exceeds 90%.