Observation Of Optical Wave Phase And Wave-Front-Correcting In Photorefractive Two-Wave Nixing

1987 ◽  
Author(s):  
Xu Kai-Ying ◽  
Xu Ke-Bin ◽  
Hong Jing
Keyword(s):  
Wave Front ◽  
Optical Wave ◽  
Wave Phase

Optical wave front dislocations

1996 ◽  
Author(s):  
I. V. Basistiy ◽  
I. G. Marienko ◽  
Marat S. Soskin ◽  
Mikhail V. Vasnetsov
Keyword(s):  
Wave Front ◽  
Optical Wave

Sub-aperture stitching with scanning pentaprism testing optical wave-front

2010 ◽  
Author(s):  
Lihua Wang ◽  
Wei Yang ◽  
Lei Li ◽  
Shibin Wu ◽  
Zhaohen Lin
Keyword(s):  
Wave Front ◽  
Optical Wave

scholarly journals Using an Adaptive Filtration to Improve Adaptive Optical Systems Performance. Analytical Review

2019 ◽  
pp. 34-60
Author(s):  
Yu. I. Shanin
Keyword(s):  
Wave Front ◽  
Adaptive Optics ◽  
Adaptive Filtering ◽  
Input Signal ◽  
Least Square ◽  
Optical Systems ◽  
Control Algorithms ◽  
Optical Wave ◽  
Adaptive Filtration ◽  
Laser Systems

For adaptive optical systems (AOS) installed in the optical path of aircraft-based laser systems, the presence of changing input light signals is typical. A wave-front sensor processes these signals. The quality of the radiation wave-front correction depends on how well the rapidly changing input signal is received and processed. When dealing with such signals, an adaptive filtration (AF) is used, which allows automatic adaptation to the changing input signal. The adaptive filtration is used in control algorithms for adaptive optical systems.The paper gives a brief theoretical AF background as applied to the AOS. The AF with feedback can be used for the following: a) predictions, b) identification of an unknown system, c) balancing of characteristics, d) disturbance rejection. The AF main point is to control the weighting factors of the input signal, which form the output signal. Under control, the difference between the reference and output signals is minimized. Mathematically, this comes down to defining the global minimum of the objective function. Among the search methods for this minimum, the paper considers the following ones: the Newton's method, the steepest-descent method and its modified version - the least square error method, and the recursive AF algorithm using the least squares criterion. The choice requirements for an adaptive algorithm are formulated.The paper considers direct application of the AF methods in the control algorithms of the AOS used in the airborne laser systems. Analyzes both the works on improving operation of classical AOS control loops (based on the PID-controllers with time-fixed gains) by adding various adaptive devices to the circuit, and the works on direct use of the adaptive filters and their relevant control algorithms. Adaptive filtering has shown the positive results both in suppressing the multiple narrow-band vibrations inherent in the aircraft and in broadband jitter due to the turbulent atmosphere, including the aero-optical wave-front aberrations of laser radiation.For more successful application of the adaptive filtering methods for AOS control, further interpretation and research into capabilities of their practical implementation for specific applications of adaptive optics is required.

Accurate test of optical wave front for optical imaging system

2011 ◽  
Vol 19 (11) ◽  
pp. 2582-2588
Author(s):  
邵晶 SHAO Jing ◽  
马冬梅 MA Dong-mei ◽  
聂真威 NIE Zhen-wei
Keyword(s):  
Optical Imaging ◽  
Wave Front ◽  
Imaging System ◽  
Optical Wave ◽  
Optical Imaging System
Sign in / Sign up

Export Citation Format

Share Document