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高重频3～5μm中波红外固体激光器由于其多方面的潜在应用而受到了广泛的重视。但该波段激光器输出具有较大的技术难度并且人眼不可见,因此对于此种激光器的近远场测试方法的报道很少。文中首先简要介绍此类激光器的产生原理,然后对激光器近场参数进行了详细测试。最后,在室外180 m距离上通过单点探测器采样进行了中波红外激光器的远场绝对功率密度测量,并与Fresnel衍射积分的理论结果进行了对比。理论和实验结果表明,此激光器波长为3.9μm,具有高平均功率和高重频的特点,功率不稳定度为10%。远场测试结果和理论计算都表明此激光器在远场具有准高斯的光强分布。考虑大气影响,测试得到远场平均能量密度为6.367 nJ/cm2,比大气经验模型计算的结果大1.3倍。该研究将对测试中波红外激光器的参数提供有益的参考,并对此激光器圆场探测器干扰阈值评估具有一定的借鉴作用。
High-frequency 3 ~ 5μm medium-wave infrared solid-state lasers have attracted wide attention due to their potential applications. However, the band laser output is more technical difficulty and the human eye is not visible, so there are few reports on the far-field test methods of such lasers. The paper first briefly introduces the principle of such laser generation, and then the laser near-field parameters were tested in detail. Finally, the far-field absolute power density of the mid-infrared infrared laser was measured by a single-spot detector at an outdoor distance of 180 m, and compared with the theoretical result of the Fresnel diffraction integral. Theoretical and experimental results show that the laser has a wavelength of 3.9μm, with high average power and high repetition rate, and the power instability is 10%. The far-field test results and theoretical calculations show that the laser has a quasi-Gaussian intensity distribution in the far field. Taking into account the influence of the atmosphere, the average energy density measured in the far field is 6.367 nJ / cm2, which is 1.3 times larger than the atmospheric empirical model. The research will provide a useful reference for testing the parameters of the infrared infrared laser and will be of reference for the evaluation of the interference threshold of the laser circular field detector.