The new model of end-pumped quasi-III-level laser considering transient pumping processes, ground-state-depletion and up-conversion effects was developed. The model consists of two parts: pumping stage and Q-switched part, which can be separated in a case of active Q-switching regime. For pumping stage the semi-analytical model was developed, enabling the calculations for final occupation of upper laser level for given pump power and duration, spatial profile of pump beam, length and dopant level of gain medium. For quasi-stationary inversion, the optimization procedure of Q-switching regime based on Lagrange multiplier technique was developed. The new approach for optimization of CW regime of quasi-three-level lasers was developed to optimize the Q-switched lasers operating with high repetition rates. Both methods of optimizations enable calculation of optimal absorbance of gain medium and output losses for given pump rate.
© 2011 OSA
(140.3460) Lasers and laser optics : Lasers
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.5560) Lasers and laser optics : Pumping
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
Lasers and Laser Optics
Original Manuscript: March 29, 2011
Revised Manuscript: June 14, 2011
Manuscript Accepted: June 23, 2011
Published: August 1, 2011
Jan K. Jabczynski and Lukasz Gorajek, "Optimization of end-pumped, actively Q-switched quasi-III-level lasers," Opt. Express 19, 15652-15668 (2011)
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