Principle demonstration of the phase locking based on the electro-optic modulator for Taiji space gravitational wave detection pathfinder mission

Heshan Liu; Yuhui Dong; Ruihong Gao; Ziren Luo; Gang Jin

doi:10.1117/1.OE.57.5.054113

23 May 2018 Principle demonstration of the phase locking based on the electro-optic modulator for Taiji space gravitational wave detection pathfinder mission

Heshan Liu, Yuhui Dong, Ruihong Gao, Ziren Luo, Gang Jin

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 054113 (May 2018). https://doi.org/10.1117/1.OE.57.5.054113

Abstract

Weak-light phase locking is a key technology for Taiji space gravitational wave detection and its pathfinder mission. Previously, the phase locking was achieved by a complicated technique, which controls the frequency of the laser via a piezo-electric actuator (kHz range or more) and a temperature actuator (sub-Hz range). We propose an easy phase-locking strategy, which is based on the electro-optic modulator (EOM). Compared with the traditional way, this strategy only needs to modulate the driven voltage of the EOM, and the frequency bandwidth can cover all ranges. An experiment is also established to prove the feasibility of the method. The results show that the noises are <80 μrad / Hz^1/2 in frequencies from 0.2 to 1 Hz, and the thermal drift is the main noise source in our recent system.

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Heshan Liu, Yuhui Dong, Ruihong Gao, Ziren Luo, and Gang Jin "Principle demonstration of the phase locking based on the electro-optic modulator for Taiji space gravitational wave detection pathfinder mission," Optical Engineering 57(5), 054113 (23 May 2018). https://doi.org/10.1117/1.OE.57.5.054113

Received: 28 March 2018; Accepted: 10 May 2018; Published: 23 May 2018

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