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Chin. Opt. Lett.
 Home  List of Issues    Issue 03 , Vol. 01 , 2003    Output beam analysis of high power COIL


Output beam analysis of high power COIL
Deli Yu1;2, Fengting Sang1, Yuqi Jin1, Yizhu Sun1
1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 1160232Nanyang Technological University, EEE, Block S1, Nanyang Avenue, Singapore 639798

Chin. Opt. Lett., 2003, 01(03): pp.149-149-

DOI:
Topic:Lasers and laser optics
Keywords(OCIS Code): 140.1550  140.3300  140.4780  

Abstract
As the output power of a chemical oxygen iodine laser (COIL) increases, the output laser beam instability appears as the far-field beam spot drift and deformation for the large Fresnel number unstable resonator. In order to interpret this phenomenon, an output beam mode simulation code was developed with the fast Fourier transform method. The calculation results show that the presence of the nonuniform gain in COIL produces a skewed output intensity distribution, which causes the mirror tilt and bulge due to the thermal expansion. With the output power of COIL increases, the mirror surfaces, especially the back surface of the scraper mirror, absorb more and more heat, which causes the drift and deformation of far field beam spot seriously. The initial misalignment direction is an important factor for the far field beam spot drifting and deformation.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Received:2002/9/10
Accepted:
Posted online:

Get Citation: Deli Yu, Fengting Sang, Yuqi Jin, Yizhu Sun, "Output beam analysis of high power COIL," Chin. Opt. Lett. 01(03), 149-149-(2003)

Note: D. Yu's e-mail address is edlyu@ntu.edu.sg.



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