Acta Photonica Sinica, Volume. 50, Issue 9, 0914002(2021)
Power Stability of a Semiconductor Laser Used in Atomic Clocks
Based on using the Acousto-optic Modulator (AOM) as a feedback device, we design the power locked setup of the 780 nm laser in the common band of atomic clocks. Through low-noise design and parameter optimization, the suppression of key sources of the noise and the laser power locking are achieved. In the frequency deviation range of 20~10 000 Hz, the relative intensity noise of laser beam is effectively suppressed. Especially at the frequency of 1 300 Hz, 20 dB suppression of RIN has been reached. At the same time, the relative power stability in the mid-term (9 000 s) has been increased 78 times from ±0.754% to ±0.009 68%. According to the typical parameters of CPT atomic clock, the influence of relative intensity noise of the laser on the frequency stability of an atomic clock is only 2.1×10–14@1 s. In addition, the mid-term stability improved from 4.67×10-2 in unlocked state to 8.67×10-5 in locked state,and it will be helpful to improve the intermediate period frequency stability of the atomic clock.
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Shuhong ZHANG, Peter YUN, Tao YANG, Qiang HAO, Xin WANG. Power Stability of a Semiconductor Laser Used in Atomic Clocks[J]. Acta Photonica Sinica, 2021, 50(9): 0914002
Category: Lasers and Laser Optics
Received: Apr. 8, 2021
Accepted: May. 31, 2021
Published Online: Oct. 22, 2021
The Author Email: WANG Xin (wangxin@ntsc.ac.cn)