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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 20461–20474

Intrinsic reduction of the depolarization in Nd:YAG crystals

Oliver Puncken, Henrik Tünnermann, James J. Morehead, Peter Weßels, Maik Frede, Jörg Neumann, and Dietmar Kracht  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 20461-20474 (2010)

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The output power of linearly polarized Nd:YAG lasers is typically limited by thermally induced birefringence, which causes depolarization. However, this effect can be reduced either by use of some kind of depolarization compensation or by use of crystals which are cut in [110]- and [100]-direction, instead of the common [111]-direction. Investigations of the intrinsic reduction of the depolarization by use of these crystals are presented. To our knowledge, this is the first probe beam-experiment describing a comparison between [100]-, [110]- and [111]-cut Nd:YAG crystals in a pump power regime between 100 and 200 W. It is demonstrated that the depolarization can be reduced by a factor of 6 in [100]-cut crystals. The simulations reveal that a reduction of depolarization by use of a [110]-cut crystal in comparison with a [100]-cut crystal only becomes possible at pump powers in the kW region. Analysis also shows that the bifocusing for [100]-cut is slightly smaller and more asymmetrical than for [111]-cut.

© 2010 OSA

OCIS Codes
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.6810) Lasers and laser optics : Thermal effects

ToC Category:
Lasers and Laser Optics

Original Manuscript: July 14, 2010
Revised Manuscript: September 2, 2010
Manuscript Accepted: September 5, 2010
Published: September 10, 2010

Oliver Puncken, Henrik Tünnermann, James J. Morehead, Peter Weßels, Maik Frede, Jörg Neumann, and Dietmar Kracht, "Intrinsic reduction of the depolarization in Nd:YAG crystals," Opt. Express 18, 20461-20474 (2010)

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