基本物理常数研究的新进展和光梳技术

New Development of Fundamental Physical Constants and Optical Comb Technology

简述了自1999年以来激光频率测量技术出现的重大突破,用飞秒锁模激光可以直接测量激光频标的绝对频率值。近年来,激光频标得到了迅速发展。在发展这项研究和技术中,真空波长和频率的精密测量有着密切的关系。为了适应研究工作的需要,研制了高精度激光波长计,测量真空波长的准确度可达2×10-8的量级,同时研制了飞秒锁模激光的测频装置,目前的测量精度可与小銫钟的精度相同。

This paper describes the important breakthrough of laser frequency measurements technology since 1999, i.e. the absolute frequency value of laser frequency standards can be directly measured by femtosecond modelocked laser. Recently, laser frequency standards have developed rapidly. The development of this technology is closely related to the precision measure- ments of vacuum wavelength and frequency. We have developed a high precision wavemeter with an accuracy of 2×10^-8 in measuring vacuum wavelength, and a frequency measurement instrument by femtosecond modelocked laser with an accuracy of commercial Cs standard.