采用光场的量子理论导出了自由运转双模激光场强度起伏的噪声功率密度谱及其时谱公式，重点分析讨论了双模激光场的量子统计特性及其拍频噪声的时谱特性和频率调谐特性。研究发现双模激光拍频噪声的时谱特性也可用于双模激光的稳频稳幅。 Based on the quantum theory of light field, the noise power density spectrum and its time-frequency spectrum of the free-running dual-mode laser field are deduced. The quantum statistical properties of the dual-mode laser field and its time-frequency characteristics and frequency Tuning characteristics. It is found that the time-frequency characteristics of dual-mode laser beat noise can also be used to stabilize the dual-mode laser.