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期刊论文

Optimization of Cr4+-Doped Saturable-Absorber Q-Switched Lasers

王青圃Xingyu Zhang Shengzhi Zhao Qingpu Wang Qidi Zhang Lianke Sun and Shaojun Zhang

IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 33, NO.12, DECEMBER 1997,-0001,():

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摘要/描述

Cr4+-doped saturable absorbers are characterized by long excited state lifetime and appreciable excited state absorption. In this paper, we first solve the three coupled rate equations describing the operation of Cr4+-doped saturableabsorber passively Q-switched lasers to obtain the expressions of pulse characteristics such as output energy, peak power, and pulsewidth. We then determine the key parameters of an optimally coupled passively Q-switched laser as functions of two variables concerning the amplifying medium, saturable-absorber medium, and pump level, and generate several design curves. These key parameters include the optimal normalized coupling parameter and the optimal normalized saturable-absorber parameter which maximize the output energy (or maximize the peak power, or minimize the pulsewidth), and the corresponding normalized energy, normalized peak power, and normalized pulsewidth. The results are valid for not only Cr4+-doped saturable-absorber Q-switched lasers but also other any lasers passively Q-switched by saturable absorbers with long excited state lifetime and appreciable excited state absorption. Using the expressions and design curves, with the aid of a simple hand calculator, one can predict the pulse characteristics and perform the design of an optimally coupled passively Q-switched laser. Index Terms-Laser resonators, nonlinear media, optimization methods, solid lasers, Q-switched lasers.

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版权说明:以下全部内容由王青圃上传于   2004年12月28日 18时41分19秒,版权归本人所有。

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