Preparation of Twin Beam with Bessel Distribution and Investigation of Its Self-Healing Property
A twin beam is a type of bright entangled optical field that has important applications in the field of quantum information.An optical beam with a spatial structure similar to a Bessel distribution possesses the property of self-healing,and its Bessel distribution can be recovered after encountering an obstacle.In this study,a low-threshold non-degenerate optical parametric oscillator with a threshold of 60 mW was proposed and developed.Based on the proposed non-degenerate optical parametric oscillator that works above the threshold,we generated a twin beam exhibiting a Gaussian distribution,yielding a power of 8 mW and an intensity difference squeezing of 5.1 dB.Subsequently,we prepared a twin beam with zero-order Bessel distribution,featuring 5 dB intensity difference squeezing,using a Bessel converter.Furthermore,we investigated its self-healing property after encountering an obstacle.The results showed that while the Bessel distribution of the twin beam was recovered,the intensity difference squeezing decreased due to obstacle-induced loss.Thus,the results of this study serve as a reference for the application of twin beams with Bessel distribution.
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