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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S5 — Sep. 12, 2011
  • pp: A1037–A1050

Full-field unsymmetrical beam shaping for decreasing and homogenizing the thermal deformation of optical element in a beam control system

Haotong Ma, Qiong Zhou, Xiaojun Xu, Shaojun Du, and Zejin Liu  »View Author Affiliations

Optics Express, Vol. 19, Issue S5, pp. A1037-A1050 (2011)

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We propose and demonstrate the full-field unsymmetrical beam shaping for decreasing and homogenizing the thermal deformation of optical element in a beam control system. The transformation of square dark hollow beam with unsymmetrical and inhomogeneous intensity distribution into square dark hollow beam with homogeneous intensity distribution is chosen to prove the validity of the technique. Dual deformable mirrors (DMs) based on the stochastic parallel gradient descent (SPGD) controller are used to redistribute the intensity of input beam and generate homogeneous square dark hollow beam with near-diffraction-limited performance. The SPGD algorithm adaptively optimizes the coefficients of Lukosz-Zernike polynomials to form the phase distributions for dual DMs. Based on the finite element method, the thermal deformations of CaF2 half transparent and half reflecting mirror irradiated by high power laser beam before and after beam shaping are numerically simulated and compared. The thermal deformations of the mirror irradiated by the laser beam with different powers and the influences of thermal deformation on beam quality are also numerically studied. Results show that full-field beam shaping can greatly decrease and homogenize the thermal deformation of the mirror in the beam control system. The strehl ratios of the high power laser beams passing through the beam control system can be greatly improved by the full-field beam shaping. The technique presented in this paper can provide effective guidance for optimum design of high power laser cavity and beam shaping system.

© 2011 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3300) Lasers and laser optics : Laser beam shaping
(140.3330) Lasers and laser optics : Laser damage
(140.6810) Lasers and laser optics : Thermal effects

ToC Category:
Nuclear Fusion

Original Manuscript: April 1, 2011
Revised Manuscript: May 19, 2011
Manuscript Accepted: June 9, 2011
Published: July 15, 2011

Haotong Ma, Qiong Zhou, Xiaojun Xu, Shaojun Du, and Zejin Liu, "Full-field unsymmetrical beam shaping for decreasing and homogenizing the thermal deformation of optical element in a beam control system," Opt. Express 19, A1037-A1050 (2011)

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