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研究了调Q激光器中微秒量级的长脉冲杂光对纳秒量级的主脉冲激光诱导冲击波的影响。通过调节调Q晶体的半波电压来改变晶体漏光和放大自发辐射的能量(长脉冲杂光),同时保持抽运功率不变,利用压电传感器聚偏氟乙烯(PVDF)测量了主脉冲激光诱导的冲击波。研究结果显示,随着漏光和放大自发辐射能量的增加,主脉冲激光能量下降,脉冲宽度增宽,导致主脉冲激光功率密度下降,主脉冲激光诱导的冲击波峰值压力下降;同时材料表面被烧蚀得越厉害,当激光总能量为6.5 J,长脉冲杂光能量为2280 mJ时,铝箔被完全烧蚀。根据试验结果对激光诱导的峰值压力公式进行了修正,修正结果适合于长脉冲杂光存在时主脉冲激光诱导冲击波峰值压力的计算。
The effect of long-pulse stray light on the main-pulse laser-induced shock wave of nanosecond magnitude in Q-switched lasers was investigated. By adjusting the half-wave voltage of the Q-switched crystal to change the energy of the crystal to leak light and amplify the spontaneous emission (long-pulse stray light) while keeping the pumping power constant, the main pulsed laser was measured using PVDF piezoelectric sensor Induced shock wave. The results show that with the increase of leakage and amplification of spontaneous emission energy, the main pulse laser energy decreases and the pulse width broadens, which leads to the decrease of the power density of the main pulse laser and the decrease of the peak pressure of the shock wave induced by the main pulse laser. At the same time, the material surface is ablated The more powerful the aluminum foil is, when the total laser energy is 6.5 J and the long pulse energy is 2280 mJ, the aluminum foil is completely ablated. According to the experimental results, the laser-induced peak pressure formula is modified, and the result is suitable for the calculation of the peak pressure of the main pulse laser-induced shock wave in the presence of long pulse stray light.