论文部分内容阅读
高增益和抽运光谱宽等因素会使光参量振荡器输出的参量光谱线大幅展宽。通常在腔内插入标准具、光栅等元件以控制谱宽,但会引入损耗,导致激光器输出阈值增大,转换效率和输出功率降低。报道了一种不使用任何谱宽压缩元件获得窄谱宽高功率中红外激光输出的方案。该方案将窄谱宽和高功率分离,分别获取。搭建了1.064μmNd…YAG主振荡功率放大结构的窄谱宽抽运源。通过调节光参量振荡器中PPMgLN晶体内的抽运光功率和光斑直径,实现晶体内增益强度的控制,从而有效控制中红外激光谱宽。在光参量振荡器中,当抽运光功率约为3倍阈值时,获得了0.7 W、谱宽小于1.12nm的2.9μm种子光,再通过两级光参量放大器后,最终获得6.27W、光光转换效率15.7%的2.9μm激光输出,谱宽基本保持不变。
Factors such as high gain and pumping spectrum width widen the parametric spectral line output by the optical parametric oscillator. It is common to insert etalons, gratings and other components in the cavity to control the spectral width, but introduces loss, resulting in increased laser output threshold, reduced conversion efficiency, and reduced output power. A scheme to obtain narrow-band-width, high-power mid-infrared laser output without using any spectral width compression element is reported. The scheme will be narrow spectrum width and high power separation, respectively, access. A narrow-spectrum wide-band pumping source with 1.064μmNd ... YAG main oscillator power amplification structure was built. By adjusting the pump power and the spot diameter of the PPMgLN crystal in the optical parametric oscillator, the gain intensity in the crystal can be controlled so as to effectively control the width of the mid-infrared laser spectrum. In the optical parametric oscillator, when the pump power is about 3 times the threshold value, a 0.7 W seed light with a spectral width of less than 1.12 nm is obtained. After passing through the two-stage optical parametric amplifier, a final 6.27 W is obtained 2.9μm laser output with 15.7% optical conversion efficiency, spectral width remained basically unchanged.