为了测量87Sr原子光晶格钟的钟激光频率和控制红冷却激光及光晶格激光的绝对频率,实验建立了一套掺铒光纤光学频率梳系统,并将其锁定到了氢钟参考信号上。光梳的可见光测量部分对689、698及813 nm等特定波长功率进行了优化(在同一扩谱...为了测量87Sr原子光晶格钟的钟激光频率和控制红冷却激光及光晶格激光的绝对频率,实验建立了一套掺铒光纤光学频率梳系统,并将其锁定到了氢钟参考信号上。光梳的可见光测量部分对689、698及813 nm等特定波长功率进行了优化(在同一扩谱支路中不同时获得),其输出光谱功率大于120 m W,单点频率下的功率在2 nm宽度时大于200 m W。实验得到的外激光和光梳梳齿拍频信号信噪比大于30 d B(在分辨率带宽300 k Hz时观测),锁定后频率跟踪秒级稳定度优于60 m Hz。展开更多
We demonstrate an optical frequency comb based on an erbium-doped-fiber femtosecond laser with the nonlinear polarization evolution scheme. The repetition rate of the laser is about 209 MHz. By controlling an intra-ca...We demonstrate an optical frequency comb based on an erbium-doped-fiber femtosecond laser with the nonlinear polarization evolution scheme. The repetition rate of the laser is about 209 MHz. By controlling an intra-cavity electro- optic modulator and a piezo-transducer, the repetition rate can be stabilized with a high-bandwidth servo in a frequency range of 3 kHz, enabling long-term repetition rate phase-locking. The in-loop frequency stability of repetition rate is about 1.6× 10-13 in an integration time of 1 s, limited by the measurement system; and it is inversely proportional to integration time in the short term. Furthermore, using a common path f-2f interferometer, the carrier envelope offset frequency of the comb is obtained with a signal-to-noise ratio of 40 dB in a 3-MHz resolution bandwidth. Stabilized cartier envelope offset frequency exhibits a deviation of 0.6 mHz in an integration time of 1 s.展开更多
文摘为了测量87Sr原子光晶格钟的钟激光频率和控制红冷却激光及光晶格激光的绝对频率,实验建立了一套掺铒光纤光学频率梳系统,并将其锁定到了氢钟参考信号上。光梳的可见光测量部分对689、698及813 nm等特定波长功率进行了优化(在同一扩谱支路中不同时获得),其输出光谱功率大于120 m W,单点频率下的功率在2 nm宽度时大于200 m W。实验得到的外激光和光梳梳齿拍频信号信噪比大于30 d B(在分辨率带宽300 k Hz时观测),锁定后频率跟踪秒级稳定度优于60 m Hz。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.91336101 and 61127901)West Light Foundation of the Chinese Academy of Sciences(Grant No.2013ZD02)
文摘We demonstrate an optical frequency comb based on an erbium-doped-fiber femtosecond laser with the nonlinear polarization evolution scheme. The repetition rate of the laser is about 209 MHz. By controlling an intra-cavity electro- optic modulator and a piezo-transducer, the repetition rate can be stabilized with a high-bandwidth servo in a frequency range of 3 kHz, enabling long-term repetition rate phase-locking. The in-loop frequency stability of repetition rate is about 1.6× 10-13 in an integration time of 1 s, limited by the measurement system; and it is inversely proportional to integration time in the short term. Furthermore, using a common path f-2f interferometer, the carrier envelope offset frequency of the comb is obtained with a signal-to-noise ratio of 40 dB in a 3-MHz resolution bandwidth. Stabilized cartier envelope offset frequency exhibits a deviation of 0.6 mHz in an integration time of 1 s.
