提出被动风冷的高光束质量、高稳定性半导体可饱和吸收镜(SESAM)锁模1064 nm Nd∶YVO4皮秒振荡器。在对SESAM 被动锁模理论进行理论分析和实验验证的基础上，获得更精确的SESAM 锁模脉宽表达式。测得该振荡器的脉宽为15.5 ps，平均功率为210 mW，重复频率为100 MHz。其光束质量因子M2=1.15，长时间均方根(RMS)功率不稳定性优于1%。整机外形紧凑，尺寸为350 mm×150 mm×50 mm。该激光器能够作为可靠的皮秒种子源用于后续的功率放大并应用于科研和工业等领域。

A compact and robust, passively air cooled picosecond 1064 nm Nd:YVO4 oscillator mode-locked by semiconductor saturable absorber mirror (SESAM) is demonstrated. Based on the theoretical analysis and experimental verification of the passive mode locking method, a more precise formula describing the pulse width of a mode locked laser is proposed. The laser operates at pulse duration of 15.5 ps and a repetition rate of 100 MHz with output power of 210 mW. It is proven to be TEM00 mode according to measured beam quality factor of M2=1.15. The root mean square (RMS) power fluctuation is less than 1% . The footprint of the laser is only 350 mm × 150 mm × 50 mm. Thus, this laser can be a reliable seed source to be amplified for more applications in research and industrial fields.