High power solid state laser operating in continuous / pulse composite mode
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摘要: 常规高功率激光器以连续或者长脉冲方式工作，与物质作用主要是依靠单一“加热”模式，针对其对复杂目标作用能力有限的问题， 提出一种连续和脉冲激光同时输出，脉宽、重频可调的新体制高功率激光技术，激光放大链路以特殊时域模式工作，即高重频脉冲与连续运转同时输出，在重频10 kHz时，实现输出功率4800 W，其中连续激光功率3600 W，脉冲激光功率1200 W，脉冲宽度为3.6 ns；在重频100 kHz时，实现输出功率4920 W，其中连续激光功率3100 W，脉冲激光功率1820 W，脉冲宽度为7 ns，光束质量4.8倍衍射极限 。Abstract: Conventional high-power lasers operate in either continuous wave or long pulse mode. They interact with materials mainly through heating, whose effects are very limited when working with complex targets. We propose a novel high-power laser technology based on the combinations of continuous and pulse lasers with adjustable pulse widths and repetition frequencies. Such a “heating/shock” function can be used to improve the effect of high-power laser by aiming the best time-domain eigenvalues of melting and gasification of various target materials. We have achieved output power of 4800 W with 3600 W from continuous wave operation and 1200 W from pulsed operation with repetition rate of 10 kHz and pulse width of 3.6 ns. When the repetition rate is increased to 100 Hz, the resultant output power of the 7 ns pulsed laser is 1820 W, while the power of the continuous laser is 3100 W, and the beam quality is 4.8 times of the diffraction limit.
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图 1 5 kW连续/脉冲高功率激光器实验装置示意图
Figure 1. 5 kW continuous / pulse high power laser experimental device structure
图 2 不同泵浦光通量下小信号增益系数随长度的变化
Figure 2. Small signal gain coefficient varies with length under different pump power
图 3 单程和双程输出能量密度计算模型
Figure 3. Calculation model of one-way and two-way output energy density
图 5 10 kHz时纯脉冲与连续/脉冲的激光脉冲
Figure 5. Laser pulse in pulse and continuous / pulse operation at 10 kHz
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