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激光二极管抽运Tm,Ho∶YLF晶体声光调Q激光器

Laser-Diode-Pumped Acoustooptic Q-Switched Tm,Ho∶YLF Laser

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摘要

对激光二极管端面抽运Tm,Ho∶YLF晶体声光调Q激光器的激光特性进行了研究。根据粒子跃迁和能量传递过程,在考虑能级传递上转换的前提下,建立了Tm,Ho∶YLF脉冲激光器的速率方程,得到了初始反转粒子数的解析表达式,分析了能量传递上转换效应对激光上能级反转粒子数的影响。在室温下实现了2 μm波长激光的脉冲输出。实验上给出并分析了Tm,Ho∶YLF脉冲激光器的平均输出功率、单脉冲能量和脉冲宽度随抽运功率以及声光Q开关调制频率的变化关系。在抽运功率为2.8 W,重复频率为9 kHz时,获得了平均输出功率为189 mW的激光脉冲,光光转换效率为6.8%。在重复频率为1 kHz时,得到最大单脉冲能量为65 μJ,峰值功率为0.17 kW。

Abstract

A laser-diode pumped actively Q-switched Tm,Ho∶YLF laser is reported. The rate equation of Tm,Ho∶YLF Q-switched laser is given including the energy transfer upconversion effect and the analytical expression of initial number of reversion particles is obtained. The influence of energy transfer upconversion effect on the number of upper level reversion particles is analyzed. At room temperature, 2 μm wavelength pulse output is realized. Average output power, single pulse energy and pulse width are measured at different pump power and different repetition rates. The average output power of 189 mW and a optical-optical efficiency of 6.8% are obtained at the repetition rate of 9 kHz and the pump power of 2.8 W. The maximum single pulse energy of 65 μJ and peak power of 0.17 kW are obtained at the repetition rate of 1 kHz.

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中图分类号:O433.5

所属栏目:激光器与激光光学

基金项目:哈尔滨工程大学基础研究基金(HEUF04014)资助课题。

收稿日期:2004-10-08

修改稿日期:2004-11-29

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张新陆:哈尔滨工业大学光电技术研究所可调谐激光国家重点实验室,哈尔滨 150001哈尔滨工程大学物理学院,哈尔滨 150001
鞠有伦:哈尔滨工业大学光电技术研究所可调谐激光国家重点实验室,哈尔滨 150001
王月珠:哈尔滨工业大学光电技术研究所可调谐激光国家重点实验室,哈尔滨 150001

联系人作者:张新陆(zhangxinlu1@sohu.com)

备注:张新陆(1972~),黑龙江伊春市人,博士,副教授,主要从事固体激光器设计与非线性光学技术研究。

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