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

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

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.

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

Closed loop control for laser beam welding

2006 ◽  
Author(s):  
A. Otto ◽  
R. Hohenstein ◽  
S. Dietrich
Keyword(s):  
Laser Beam ◽  
Closed Loop ◽  
Laser Beam Welding ◽  
Closed Loop Control ◽  
Loop Control

Closed-loop laser beam alignment along active robot arm

1993 ◽  
Author(s):  
Carla C. Neumann ◽  
Felix E. Morgan ◽  
Terry S. Shirrod
Keyword(s):  
Laser Beam ◽  
Closed Loop ◽  
Robot Arm ◽  
Laser Beam Alignment

scholarly journals Fractional-Order Sliding Mode Control of Overhead Cranes   

2020 ◽  
Vol 31 (1) ◽  
pp. 68-76
Keyword(s):  
Sliding Mode Control ◽  
Fractional Order ◽  
Closed Loop ◽  
Control Structure ◽  
Adaptive System ◽  
Sliding Mode ◽  
Lyapunov Theory ◽  
Closed Loop System ◽  
Control Approach ◽  
Mode Control

We constitute a control system for overhead crane with simultaneous motion of trolley and payload hoist to destinations and suppression of payload swing. Controller core made by sliding mode control (SMC) assures the robustness. This control structure is inflexible since using fixed gains. For overcoming this weakness, we integrate variable fractional-order derivative into SMC that leads to an adaptive system with adjustable parameters. We use Mittag–Leffler stability, an enhanced version of Lyapunov theory, to analyze the convergence of closed-loop system. Applying the controller to a practical crane shows the efficiency of proposed control approach. The controller works well and keeps the output responses consistent despite the large variation of crane parameters.

Closed loop adaptive system with Hartmann wavefront sensor for CO2 laser radiation correction

2014 ◽  
Author(s):  
Alexis Kudryashov ◽  
Alex Alexandrov ◽  
Vadim Samarkin ◽  
Alexey Rukosuev ◽  
Pierre Galarneau
Keyword(s):  
Laser Radiation ◽  
Closed Loop ◽  
Adaptive System ◽  
Wavefront Sensor ◽  
Radiation Correction
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