Resonant photodetector for cavity- and phase-locking of squeezed state generation

Based on the requirement ofsqueezed state generation, we build the phase relationship between two electronic local oscillators for the cavity- and phase-locking branches, and a 2-way 90 ° power splitter is adopted to satisfy the phase relationship simultaneously, which greatly simplifies the experimental setup and adjusting process. A LC parallel resonant circuit, which is composed by the inherent capacitance of aphotodiode and an extrainductor, is adopted in the resonant photodetector to improve the gain factor at the expected frequency. The gain of the resonant photodetector is about 30 dB higher than that of the broadband photodetector at the resonant frequency. The peak-to-peak value of the error signal for cavity-locking (phase-locking) with the resonant photodetector is 240 (260) times of that with the broadband photodetector, which can improve the locking performance on the premise of not affecting the squeezing degree.

Source: Review of Scientific Instruments - October 31, 2016 Category: Physics Authors: Chaoyong Chen, Zhixiu Li, Xiaoli Jin and Yaohui Zheng Source Type: research