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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 1, Iss. 3 — Mar. 20, 2003
  • pp: 149–152

Output beam analysis of high power COIL

Deli Yu, Fengting Sang, Yuqi Jin, and Yizhu Sun  »View Author Affiliations

Chinese Optics Letters, Vol. 1, Issue 3, pp. 149-152 (2003)

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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.

© 2005 Chinese Optics Letters

OCIS Codes
(140.1550) Lasers and laser optics : Chemical lasers
(140.3300) Lasers and laser optics : Laser beam shaping
(140.4780) Lasers and laser optics : Optical resonators

Deli Yu, Fengting Sang, Yuqi Jin, and Yizhu Sun, "Output beam analysis of high power COIL," Chin. Opt. Lett. 1, 149-152 (2003)

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