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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 12 — Apr. 20, 2013
  • pp: 2546–2554

Simple and sensitive technique for alignment of the pinhole of a spatial filter of a high-energy, high-power laser system

Avnish Kumar Sharma, Rajesh Kumar Patidar, Deepak Daiya, Anandverdhan Joshi, Prasad Anant Naik, and Parshotam Dass Gupta  »View Author Affiliations


Applied Optics, Vol. 52, Issue 12, pp. 2546-2554 (2013)
http://dx.doi.org/10.1364/AO.52.002546


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Abstract

In this paper, a new method for alignment of the pinhole of a spatial filter (SF) has been proposed and demonstrated experimentally. The effect of the misalignment of the pinhole on the laser beam profiles has been calculated for circular and elliptical Gaussian laser beams. Theoretical computation has been carried out to illustrate the effect of an intensity mask, placed before the focusing lens of the SF, on the spatial beam profile after the pinhole of the SF. It is shown, both theoretically and experimentally, that a simple intensity mask, consisting of a black dot, can be used to visually align the pinhole with a high accuracy of 5% of the pinhole diameter. The accuracy may be further improved using a computer-based image processing algorithm. Finally, the proposed technique has been demonstrated to align a vacuum SF of a compact 40 J Nd:phosphate glass laser system.

© 2013 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3530) Lasers and laser optics : Lasers, neodymium
(220.1140) Optical design and fabrication : Alignment
(330.6110) Vision, color, and visual optics : Spatial filtering

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 31, 2013
Manuscript Accepted: March 1, 2013
Published: April 12, 2013

Citation
Avnish Kumar Sharma, Rajesh Kumar Patidar, Deepak Daiya, Anandverdhan Joshi, Prasad Anant Naik, and Parshotam Dass Gupta, "Simple and sensitive technique for alignment of the pinhole of a spatial filter of a high-energy, high-power laser system," Appl. Opt. 52, 2546-2554 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-12-2546


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