Closed-loop adaptive system for laser beam control

2001 ◽  
Author(s):  
Alexis V. Kudryashov ◽  
Alexey L. Rukosuev ◽  
Alexander Alexandrov ◽  
Valentina Y. Zavalova ◽  
Vadim V. Samarkin
Keyword(s):  
Laser Beam ◽  
Closed Loop ◽  
Adaptive System ◽  
Beam Control

Correction of vortex laser beam in a closed-loop adaptive system with bimorph mirror

2009 ◽  
Vol 34 (15) ◽  
pp. 2264 ◽  
Author(s):  
F. A. Starikov ◽  
G. G. Kochemasov ◽  
M. O. Koltygin ◽  
S. M. Kulikov ◽  
A. N. Manachinsky ◽  
...  
Keyword(s):  
Laser Beam ◽  
Closed Loop ◽  
Adaptive System

Adaptive optical elements for laser beam control

2001 ◽  
Author(s):  
Alexis V. Kudryashov ◽  
Vadim V. Samarkin ◽  
Alexander Aleksandrov
Keyword(s):  
Laser Beam ◽  
Optical Elements ◽  
Beam Control

scholarly journals 1178 J, 527 nm near diffraction limited laser based on a complete closed-loop adaptive optics controlled off-axis multi-pass amplification laser system

2021 ◽  
Vol 9 ◽  
Author(s):  
Deen Wang ◽  
Xin Zhang ◽  
Wanjun Dai ◽  
Ying Yang ◽  
Xuewei Deng ◽  
...  
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Closed Loop ◽  
Focal Spot ◽  
Beam Quality ◽  
Laser System ◽  
Diffraction Limit ◽  
Kdp Crystal ◽  
Main Amplifier

Abstract A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics (AO) controlled off-axis multi-pass amplification laser system. Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier, a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62% conversion efficiency, 1178 J and beam quality of 7.93 times the diffraction limit (DL). By using a complete closed-loop AO configuration, the static and dynamic wavefront distortions of the laser system are measured and compensated. After correction, the diameter of the circle enclosing 80% energy is improved remarkably from 7.93DL to 1.29DL. The focal spot is highly concentrated and the 1178 J, 527 nm near diffraction limited laser is achieved.

scholarly journals Nonlinear optics and liquid crystal light valve for laser beam control

2008 ◽  
Vol 139 ◽  
pp. 012010
Author(s):  
Jean Pierre Huignard ◽  
Arnaud Brignon ◽  
Bastien Steinhausser
Keyword(s):  
Liquid Crystal ◽  
Nonlinear Optics ◽  
Laser Beam ◽  
Beam Control ◽  
Light Valve

Carbon Dioxide Laser Beam Control for Corneal Surgery

1981 ◽  
Vol 12 (2) ◽  
pp. 117-122
Author(s):  
Richard H Keates ◽  
Leno S Pedrotti ◽  
Hugo Weichel ◽  
William H Possel
Keyword(s):  
Carbon Dioxide ◽  
Laser Beam ◽  
Carbon Dioxide Laser ◽  
Corneal Surgery ◽  
Beam Control

Adaptive Tuning Functions Tracking Control with Nonlinear Adaptive Observers

2014 ◽  
Vol 11 (2) ◽  
pp. 14-21
Author(s):  
R. Mishkov ◽  
V. Petrov
Keyword(s):  
Tracking Control ◽  
Closed Loop ◽  
Adaptive System ◽  
Permanent Magnet Synchronous Motor ◽  
Unified Approach ◽  
Closed Loop System ◽  
Estimation Errors ◽  
Nonlinear Adaptive Control ◽  
Performance Specifications ◽  
System Time

Abstract The paper is dedicated to the derivation of a unified approach for nonlinear adaptive closed loop system design with nonlinear adaptive state and parameter observers combined with tuning functions-based nonlinear adaptive control for trajectory tracking. The proposed approach guarantees asymptotic stability of the closed loop nonlinear adaptive system with respect to the tracking and state estimation errors and Lyapunov stability of the parameter estimator. The advantages of the approach are the lack of over-parametrization, resulting in a minimal number of estimator equations and the preservation of the overdamped performance specifications of the closed loop nonlinear adaptive system in its whole range of operation. The application of the approach to a permanent magnet synchronous motor driven inverted pendulum concludes with simulation of the closed loop nonlinear adaptive system time responses.

scholarly journals Spectroscopic closed loop control of penetration depth in laser beam welding process

2012 ◽  
Author(s):  
Teresa Sibillano ◽  
Antonio Ancona ◽  
Domenico Rizzi ◽  
Francesco Mezzapesa ◽  
Ali Riza Konuk ◽  
...  
Keyword(s):  
Laser Beam ◽  
Penetration Depth ◽  
Closed Loop ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Closed Loop Control ◽  
Loop Control

The principles of laser beam control with polarization gratings introduced as diffractive waveplates

2010 ◽  
Author(s):  
S. R. Nersisyan ◽  
N. V. Tabiryan ◽  
D. M. Steeves ◽  
B. R. Kimball
Keyword(s):  
Laser Beam ◽  
Beam Control ◽  
Polarization Gratings
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