A comprehensive theory is presented for fm spectroscopy of doppler - broadened molecular iodine absorption lines . the relationship betwcen fm spectroscopy and modulation frequency and modulation index has been studied . the whole circuit for thc frcquency stabilized laser system has been developed 建立了多普勒加宽碘分子线性吸收fm光谱的一般理论，对fm光谱与调制频率和调制度的关系进行了研究；并研制了532nmnd : yvo _ 4 / ktp碘吸收稳频激光器的电路系统；提出了虚拟激光稳频技术的概念。
