一、引言本文介绍一台钕玻璃超短脉冲振荡器,单脉冲选择器和激光放大器,以及超短脉冲宽度测量方法。一般激光振荡器输出激光是多模式的。如果激光器是单横模工作时,由谐振腔的共振条件给出的各个纵模的频率应该是等间隔的,各纵模频率等间隔加上各模式初位相相同,这就是锁模的两个条件。但是由于激光介质的色散(一次极化)而引起的频率牵引效应,使谐振腔的振荡频率的等间隔性遭到破坏,并且频率不同的各个纵模 I. Introduction This article describes a neodymium glass ultrashort pulse oscillator, a single pulse selector and laser amplifier, and ultrashort pulse width measurement method. General laser oscillator output laser is multi-mode. If the laser is a single transverse mode of work, given by the resonant cavity resonance frequency of each longitudinal mode should be equally spaced, the longitudinal frequency of each mode plus the initial phase of the same pattern, which is the two mode-locked condition. However, the frequency pulling effect due to the dispersion (primary polarization) of the laser medium deteriorates the equal interval property of the oscillation frequency of the resonator, and each of the longitudinal modes having different frequencies