We present a high-precision optical phase-locking based on wideband acousto-optical frequency shifting. Increasing the modulating bandwidth stabilizes the loop at a high loop gain, thus improving phase correction capability. An optical phase-locked loop with a wide control bandwidth is constructed. The closed-loop residual phase error is only 0.26o or smaller than \lambda/1000. The loop exhibits excellent correction capability for high-frequency noises. The correctable frequency range reaches 35 kHz when the noise amplitude is +(-)\lambda/2, and becomes even wider for smaller noise amplitudes.
© 2014 Chinese Optics Letters
Lasers and Laser Optics
Yunxiang Wang, Qi Qiu, Shuangjin Shi, Jun Su, Yun Liao, and Caidong Xiong, "High-precision optical phase-locking based on wideband acousto-optical frequency shifting," Chin. Opt. Lett. 12, 021402- (2014)