scholarly journals The influence of thermal effects in a beam control system and spherical aberration on the laser beam quality

2004 ◽  
Vol 53 (3) ◽  
pp. 952
Author(s):  
Ji Xiao-Ling ◽  
Tao Xiang-Yang ◽  
Lyu Bai-Da
Keyword(s):  
Control System ◽  
Laser Beam ◽  
Thermal Effects ◽  
Spherical Aberration ◽  
Beam Quality ◽  
Beam Control ◽  
Laser Beam Quality

Experiment Study of Influence on Laser Beam Quality Induced by Thermal Lens Effect and Depolarization Effect

2010 ◽  
Vol 43 ◽  
pp. 670-674
Author(s):  
Xia Ye ◽  
Hong Bing Yao ◽  
Yan Qun Tong ◽  
Yong Kang Zhang ◽  
Ruo Xi Cao ◽  
...  
Keyword(s):  
Laser Beam ◽  
Thermal Lens ◽  
Thermal Effects ◽  
Beam Quality ◽  
Double Refraction ◽  
Lens Effect ◽  
Laser Beam Quality ◽  
Depolarization Effect ◽  
Output Laser ◽  
Thermal Lens Effect

For high power and repetitive Nd:Glass laser, there would appear serious thermal effect due to the significantly-enhanced pumping optical power density in laser rod, which would induce thermal double refraction, phase distortion, thermal focusing, thermal depolarization, etc. Thus, the laser output power and beam quality would be influenced severely. Influence of thermal lens effect and depolarization effect caused by thermal stress double refraction on laser beam were studied in this paper for high power and repetitive laser. In the experiment of thermal lens effect, change of the laser spot by thermal lens effect was recorded after a TEM00 He-Ne laser beam passing through the Nd:Glass rod pumped by Xe lamp, and the corresponding optical compensator was applied to eliminate the thermal lens effect to improve the beam quality. Configuration of polarizer was designed in our experiment to research the depolarization effect caused by thermal stress double refraction. First, emergent light distribution and loss factor caused by double refraction was calculated according to the theoretical model. Then the exiting cone-shaped polarized light intensity distribution was obtained through the experiment. It could be obtained from the experiments that thermal lens effect and depolarization effect caused by thermal double refraction would reduce the output laser beam quality to varied extents. As the number of laser pulses increased, thermal effects began to emerge and the output laser energy apparently decreased; when the thermal effects steadied, the output energy would be tending towards stability.

On-line control of laser beam quality by means of diffractive optical components

2003 ◽  
Author(s):  
Michael R. Duparre ◽  
Carsten Rockstuhl ◽  
Andreas Letsch ◽  
Siegmund Schroeter ◽  
Vladimir S. Pavelyev
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Optical Components ◽  
On Line ◽  
Laser Beam Quality

scholarly journals Laser beam quality and pointing measurement with an optical resonator

2007 ◽  
Vol 78 (7) ◽  
pp. 073103 ◽  
Author(s):  
Patrick Kwee ◽  
Frank Seifert ◽  
Benno Willke ◽  
Karsten Danzmann
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Optical Resonator ◽  
Laser Beam Quality
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