为了建立一个基于888nm半导体抽运的高平均功率和高效率皮秒激光振荡器的理论模型，采用模拟计算方法和谐振腔理论、ABCD定律、自洽条件以及连续被动锁模条件，利用激光晶体Nd∶YVO4对波长888nm半导体抽运源的吸收特性和元件的相关参量、合适的腔模参量、实现稳定锁模的参量进行了理论分析和计算，并通过以上研究和模拟计算得到了皮秒振荡器模型的相关数据。结果表明，在120W的抽运功率下，激光器可以输出约61.5W的皮秒激光，光光转换效率51.3％。这一理论模型的建立对高平均功率和高效率皮秒激光振荡器的实验研究起着指导作用。

A theoretical model of high power and high efficiency picosecond laser oscillator pumped by 888nm LD was fabricated. Based on simulation calculation, resonance theory, ABCD law, self-consistent condition and continuous passive mode locking condition, absorption property of crystal Nd∶YVO4 at 888nm wavelength, appropriate element parameters and mode parameters, and mode locking parameters were analyzed and calculated. Parameters of a model of picosecond laser oscillator were obtained based on the above calculated results. The results indicate that 61.5W high average power can be generated with 120W pump power and optical to optical conversion efficiency is 51.3％. The model helps for experiment on picosecond laser oscillator with high average power.