title: Nonreciprocal feedback in a ring laser and its application.
abstract: We reported the feedback characteristics of a ring laser with nonreciprocal feedback configuration. The clockwise/counterclockwise laser output is reflected and then reinjected into the cavity with the same direction. A nonreciprocal device composed of two quarter-wave plates and a Faraday rotator is placed in the feedback path so as to form a nonreciprocal feedback configuration. The beat frequency of the ring laser depends on the parameters of optical components in the nonreciprocal feedback path. As a result, it provides a new method for self-mixing interferometry. We discussed the possibility to use the nonreciprocal feedback to bias the ring laser, which, to our knowledge, is a novel optical biasing method.
authors: Department of Opto-Electronic Engineering, College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China. maxborn@nudt.edu.cn
authors: Zhiguo
authors: Z
authors: Wang
authors: Fei
authors: F
authors: Wang