Author Affiliations
Abstract
1 School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
2 School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China
3 Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
4 National Key Laboratory of Science and Technology on Space Microwave, Xi’an 710100, China
A polarization-independent nonmechanical laser beam steering scheme is proposed to realize continuous two-dimensional (2D) scanning with high efficiency, where the core components are two polarization-dependent devices, which are called liquid crystal optical phased arrays (LC-OPAs). These two one-dimensional (1D) devices are orthogonally cascaded to work on the state of azimuthal and elevation steering, respectively. Properties of polarization independence as well as 2D beam steering are mathematically and experimentally verified with a good agreement. Based on the experimental setup, linearly polarized beams with different polarization angles are steered with high accuracy. The measured angular deviations are less than 5 μrad, which is on the same order of the accuracy of the measurement system. This polarization-independent 2D laser beam steering scheme has potential application for nonmechanical laser communication, lidar, and other LC-based systems.
160.3710 Liquid crystals 120.4820 Optical systems 230.3720 Liquid-crystal devices Chinese Optics Letters
2017, 15(10): 101601
Author Affiliations
Abstract
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.
140.0140 Lasers and laser optics 140.3298 Laser beam combining 140.3518 Lasers, frequency modulated Chinese Optics Letters
2014, 12(2): 021402
