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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 21 — Jul. 20, 2006
  • pp: 5377–5384

Maximum value of the pulse energy of a passively Q-switched laser as a function of the pump power

Jianlang Li, Ken-ichi Ueda, Jun Dong, Mitsuru Musha, and Akira Shirakawa  »View Author Affiliations

Applied Optics, Vol. 45, Issue 21, pp. 5377-5384 (2006)

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The finite recovery time T s of the bleached absorber is presented as one of the possible mechanisms accounting for the increase–maximum–decrease in pulse energy E with the pumping rate W P in cw-pumped passively Q-switched solid-state lasers, by analytically evaluating the sign of the derivative E / W P . The results show that, in the low pump regime ( T > T s , T is the interpulse period), the initial population density n i remains constant, the final population density n f decreases with W P , and this results in a monotonic increase of E with W P . In the high pump regime ( T < T s ) , n i decreases but n f remains the same with W P ; this results in a monotonic decrease of E with W P . At the critical region ( T T s ) , E reaches its maximum value. A cw-pumped Yb:YAG laser passively Q switched by a Cr 4+ : YAG absorber is demonstrated to confirm this model. The theoretical model is also applied to the analysis of three previously reported passive Q switching solid-state [ Nd : GdVO 4 , Nd + : La Sc 3 ( BO 3 ) 4 ( Nd + : LSB ) , and Nd : YAG ] lasers experiments.

© 2006 Optical Society of America

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.3580) Lasers and laser optics : Lasers, solid-state

ToC Category:
Lasers and Laser Optics

Original Manuscript: January 23, 2006
Manuscript Accepted: February 12, 2006

Jianlang Li, Ken-ichi Ueda, Jun Dong, Mitsuru Musha, and Akira Shirakawa, "Maximum value of the pulse energy of a passively Q-switched laser as a function of the pump power," Appl. Opt. 45, 5377-5384 (2006)

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