It is shown that the pump parameter and intensity noise correlation time are the major factors of the first - order - like transition . angular noise correlation time has great influence on the linewidth in the power spectrum 研究结果表明,抽运参量和噪声相关时间是激光系统出现一级相变类比的关键因素,角噪声相关时间对强度谱分布中的线宽影响较大。