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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 22 — Aug. 1, 2006
  • pp: 5767–5776

Optimization of peak power of doubly Q -switched lasers with both an acousto-optic modulator and a Cr4+-doped saturable absorber

Dechun Li, Shengzhi Zhao, Guiqiu Li, and Kejian Yang  »View Author Affiliations


Applied Optics, Vol. 45, Issue 22, pp. 5767-5776 (2006)
http://dx.doi.org/10.1364/AO.45.005767


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Abstract

A doubly Q-switched laser can obtain a shorter pulse with a stable repetition rate and high pulse peak power, which has been experimentally proved. By taking into account the Gaussian spatial distributions of the intracavity photon density and the initial population-inversion density as well as the influence of the acousto-optic (AO) Q switch, we introduce the coupled rate equations for a doubly Q-switched laser with both an AO modulator and a Cr 4+ -doped saturable absorber. These coupled rate equations are solved numerically. The key parameters of an optimally coupled doubly Q-switched laser are determined based on maximizing the peak power, which include the optimal normalized coupling parameter, the optimal normalized saturable absorber parameters, and the normalized parameters of the AO Q switch. The optimal normalized peak power, the corresponding normalized energy, and the normalized pulse width are also given, and a group of general curves are generated for the first time to our knowledge. The curves can give us a good understanding of the dependence of the optimal key parameters on the parameters of the gain medium, the saturable absorber, the AO Q switch, the resonator, and the spatial distributions of the intracavity photon density. The optimal calculations for a diode-pumped Nd 3+ : YVO 4 laser with both an AO modulator and a Cr 4+ : YAG saturable absorber are presented to demonstrate the use of the curves and the related formulas.

© 2006 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.5560) Lasers and laser optics : Pumping

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 4, 2006
Revised Manuscript: March 3, 2006
Manuscript Accepted: March 3, 2006

Citation
Dechun Li, Shengzhi Zhao, Guiqiu Li, and Kejian Yang, "Optimization of peak power of doubly Q-switched lasers with both an acousto-optic modulator and a Cr4+-doped saturable absorber," Appl. Opt. 45, 5767-5776 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-22-5767

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