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ACTA PHOTONICA SINICA

Stabilizing the Optical Parametric Oscillator Cavity by Fringe-locking Technique in Preparation of Squeezed State of Light

曲文艳 QU Wen-yan, 宋家争 Song Jia-zheng, 冯飞 FENG Fei, 薛玉郎 XUE Yu-lang, 张同意 ZHANG Tong-yi

Published Jan 1, 2014• 1 citation
Publisher
DOI
10.3788/gzxb20144309.0914004

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Optical parametric oscillation is the critical part in the preparation of squeezed states of light. The mode-matching and fringe locking technique should be employed to improve the stability of the optical parametric oscillator cavity. How the mode-matching efficiency influence the squeezing degree of the squeezed light and the locking accuracy of the fringe locking technique were analyzed theoretically. Then the fringe locking technique was employed to stabilize the optical parametric oscillator cavity after the mode-matching between the laser mode and the fundamental mode of the cavity. The theoretical and experimental results show that a perfect mode-matching would improve the squeezing degree and the locking accuracy of the fringe locking technique, when the mode-matching is optimized, the length variance of the cavity is 7.35 nm and the locking time is no less than 2 h, which is sufficient for the detection of the squeezed states of light. ©, 2015, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
A fringe-locking technique was employed to stabilize the optical parametric oscillator cavity,which would be affected by external environmental disturbance,such as vibration and airflow.First,how the locking point influence the squeezing degree was analyzed theoretically,the results show that position at half of the transmission peak could be the best locking point.Then the fringe-locking technique was applied to achieve the resonance between the optical parametric oscillator cavity and the injected infrared light experimentally.The experimental results show that the length variance of the cavity in continuous operation over 2his 7.27 nm and the longest locking time is 3.8h,which is sufficient for the detection of the squeezed states of light.
The effect of mode matching on the preparation of the squeezed light at 1064 nm with periodically poled KTiOPO 4 (PPKTP) crystal is reported. We can derive the desired mode by improving the spatial mode matching into optical cavities, including the beam from the laser mode matched to the optical parametric amplifier cavity and mode cleaning cavity; also it is useful for the stability of the locking systems. By increasing the fringe visibility between the squeezed light and the local oscillator beam, a squeezing level of −8.75 dB or even higher could be observed, even with the same experimental parameters as described elsewhere.