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Optical Engineering

Theoretical analysis of intracavity tilt perturbation and aberration correction for unstable laser resonators
Author(s): Xiang Zhang; Bin Xu; Wei Yang
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Paper Abstract

The influence on an outcoupled mode by introducing intracavity tilt perturbation in an unstable resonator is developed. The intra-cavity mode properties and Zernike aberration with the intracavity mirror's misadjustment are calculated theoretically. The experimental results about the relations of intracavity perturbation and the properties of mode aberration are presented by adopting a Shack-Hartmann (H-S) wavefront sensor. The results show that the intracavity perturbation of the concave mirror has a more remarkable effect on outcoupled beam quality than that of the convex mirror. For a large Fresnel-number resonator, the tilt angle of the intracavity mirror has a near-linear relationship with the extracavity Zernike tilt coefficient. The ratio of the tilt aberration coefficient approaches the magnification of the unstable resonator if equivalent perturbation is applied to the concave and convex mirrors, respectively. Furthermore, astigmatism and defocus also increase with tilt aberration of the mode. So an intracavity phase-corrected element used in an unstable resonator will be most effective when placed as near as possible to the concave mirror plane. Based on these results, a control system for correcting intracavity tilt aberrations is established, and the aberration-corrected results are presented.

Paper Details

Date Published: 1 October 2006
PDF: 9 pages
Opt. Eng. 45(10) 104203 doi: 10.1117/1.2358635
Published in: Optical Engineering Volume 45, Issue 10
Show Author Affiliations
Xiang Zhang, Institute of Optics and Electronics (China)
Bin Xu, Institute of Optics and Electronics (China)
Wei Yang, Institute of Optics and Electronics (China)

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