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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 13 — Jun. 27, 2005
  • pp: 4952–4962

Very high-order pure Laguerre-Gaussian mode selection in a passive Q-switched Nd:YAG laser

Amiel A. Ishaaya, Nir Davidson, and Asher A. Friesem  »View Author Affiliations

Optics Express, Vol. 13, Issue 13, pp. 4952-4962 (2005)

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An intra-cavity phase element, combined with a passive Q-switch saturable absorber and a suitable intra-cavity aperture, can provide extremely high mode discrimination, so as to obtain laser operation with single, pure, very high order Laguerre-Gaussian mode. With a Nd:YAG laser setup, well controlled and extremely stable Q-switched operation in the degenerate Laguerre-Gaussian TEM04, TEM14, TEM24, TEM34 , and TEM44 modes was obtained. The measured output energy per pulse for each of these modes was 5.2mJ, 7.5mJ, 10mJ, 12.5mJ, and 13.7mJ respectively, compared to 2.5mJ for the Gaussian mode without the phase element (more than a five fold increase in output energy). Correcting the phase for these modes, so that all transverse lobes have uniform phase, results in a very bright and narrow central lobe in the far field intensity distribution that can theoretically contain more than 90% of the output energy.

© 2005 Optical Society of America

OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(140.3410) Lasers and laser optics : Laser resonators
(160.4670) Materials : Optical materials
(310.6860) Thin films : Thin films, optical properties
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)

ToC Category:
Research Papers

Original Manuscript: April 22, 2005
Revised Manuscript: June 11, 2005
Published: June 27, 2005

Amiel Ishaaya, Nir Davidson, and Asher Friesem, "Very high-order pure Laguerre-Gaussian mode selection in a passive Q-switched Nd:YAG laser," Opt. Express 13, 4952-4962 (2005)

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