scholarly journals Wavefront control of laser beam using optically addressed liquid crystal modulator

2018 ◽  
Vol 6 ◽  
Author(s):  
Dajie Huang ◽  
Wei Fan ◽  
He Cheng ◽  
Gang Xia ◽  
Lili Pei ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Control Method ◽  
Phase Distribution ◽  
Phase Retardation ◽  
Light Modulator ◽  
Wavefront Control ◽  
Spatial Phase ◽  
Working Principle ◽  
The Relationship

An optically addressed liquid crystal modulator for wavefront control of 1053 nm laser beam is reported in this paper. Its working principle, control method and spatial phase modulation capability are mainly introduced. A new method of measuring the relationship between gray level and phase retardation is proposed. The rationality of the curve is further confirmed by designing special experiments. According to the curve, several spatial phase distributions have been realized by this home-made device. The results show that, not only the maximum phase retardation is larger than $2\unicode[STIX]{x03C0}$ for 1053 nm wavelength, but also the control accuracy is high. Compared with the liquid crystal on silicon type spatial light modulator, this kind of modulator has the advantages of generating smooth phase distribution and avoiding the black-matrix effect.

Precision Control of Laser Beam Based on Liquid Crystal Spacial Light Modulator in Ultro-Precision Manufacturing

2014 ◽  
Vol 613 ◽  
pp. 401-407
Author(s):  
Jian Zhang ◽  
Li Ying Wu ◽  
Dong Wang
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Phase Distribution ◽  
Focal Point ◽  
Incident Beam ◽  
Far Field ◽  
Precision Manufacturing ◽  
Light Modulator ◽  
Precision Control ◽  
Distribution Shape

Laser beam precision control in ultro-precision manufacturing or other applications is to manipulate the beam pointing, intensity distribution, shape, far field patterns and so on. The method of beam control we used is different from traditional way that with mechanical inertia parts. The Liquid Crystal Spacial Light Modulator (LCSLM) is an electronic controlled, programmable diffractive device, which is able to modulate the phase of incident beam, therefore generate the objective patterns in far field. To establish the relationship between phase distribution of LCSLM and the far field objective function that represents the requirement of application, FFT and improved G-S algorithm are employed. Multi-beam focal point 3D control, beam shaping from Gaussian distribution to square and annular distribution with flat-top are discussed. They were studied in both theoretical and experimental ways. The results are evaluated by using error of root mean square and diffraction efficiency, which are less than 1% and higher than 90%, respectively.

Study on the generation of a vortex laser beam by using phase-only liquid crystal spatial light modulator

2013 ◽  
Vol 52 (9) ◽  
pp. 091721 ◽  
Author(s):  
Haotong Ma ◽  
Haojun Hu ◽  
Wenke Xie ◽  
Xiaojun Xu
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Spatial Light Modulator ◽  
Light Modulator

Wavefront control with a spatial light modulator containing dual-frequency liquid crystal

2004 ◽  
Author(s):  
Dong-Feng Gu ◽  
Bruce Winker ◽  
Bing Wen ◽  
Don Taber ◽  
Andrew Brackley ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Dual Frequency ◽  
Light Modulator ◽  
Wavefront Control

Characterization of depolarizing fringing fields of a liquid crystal spatial light modulator for laser beam steering

2004 ◽  
Author(s):  
Emil J. Haellstig ◽  
Torleif Martin ◽  
Johan Stigwall ◽  
Lars Sjoqvist ◽  
Mikael Lindgren
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Spatial Light Modulator ◽  
Beam Steering ◽  
Light Modulator ◽  
Fringing Fields

Wave Front Correction and Measurement by Using a Liquid Crystal Spatial Light Modulator

2010 ◽  
Vol 437 ◽  
pp. 319-323
Author(s):  
Jian Zhang ◽  
Li Ying Wu ◽  
Li Min Zou
Keyword(s):  
Liquid Crystal ◽  
Wave Front ◽  
Spatial Light Modulator ◽  
Incident Beam ◽  
Liquid Crystal Cell ◽  
Distortion Correction ◽  
Light Modulator ◽  
Voltage Change ◽  
The Relationship ◽  
After Error

To correct wave front distortion, a phased only Liquid Crystal Spatial Light Modulator (LCSLM) is used. LCSLM can modulate the phase of the incident beam by changing the electric field applied to the transparent electrodes of a liquid crystal cell. The voltage change causes the refractive index of the liquid crystal change, so a phase shift produces. The distortion of a wave front can be measured by using a wave front interferometer. Since each pixel of SLM may be addressed and controlled independently, so proper voltage is supplied to each pixel to compensate the phase corresponding to the distortion. Before wave front correction, the LCSLM is tested and corrected by employing a Twyman-Green interferometer, which shows the relationship between the applied voltage and the phase value of each pixel. Experiment result shows that after error compensation of LCSLM, the wave front distortion correction accuracy reaches 0.06 λ.

Performance of a high-resolution wavefront control system using a liquid crystal spatial light modulator

2000 ◽  
Author(s):  
Charles A. Thompson ◽  
Michael W. Kartz ◽  
Scot S. Olivier ◽  
James M. Brase ◽  
Carmen J. Carrano ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Control System ◽  
High Resolution ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Wavefront Control

Laser beam steering and tracking using a liquid crystal spatial light modulator

2003 ◽  
Author(s):  
Emil Haellstig ◽  
Johan Stigwall ◽  
Mikael Lindgren ◽  
Lars Sjoqvist
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Spatial Light Modulator ◽  
Beam Steering ◽  
Light Modulator
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