中波红外激光器的光束指向红外图像检测法

由于中波红外(3～5μm)探测器在军事上的广泛应用,基于中波红外激光器的定向红外发射装置已经成为发展的重点,而其中的激光束指向稳定性就成为非常重要的参数。对于一种光学参量振荡(OPO)产生的中波红外激光器进行了指向稳定性的测试,测试采用了中波红外成像系统及边缘提取与阈值的图像算法,获得了此种激光器的指向稳定性数据。实验结果表明,此激光器在常温下的最大指向偏移量为1.1mrad,平均值为0.3mrad。激光二极管(LD)抽运源晶体及非线性OPO晶体的温控还有进一步提高的可能性。研究结果将为中波红外激光器的研制、光束整形与光束指向测量与稳定技术提供参考。

Method of Pointing Measurement Based on Infrared Image Processing for Mid-Infrared Laser

The directed infrared projecting device based on mid-infrared laser has become more important because the mid-infrared(3~5 μm) detectors have been widely applied in the military field.The beam pointing stability is the key parameter for such application.The beam pointing measurement is conducted for an optical parameter oscillation(OPO) mid-infrared laser.The mid-infrared imaging system,image edge extraction algorithm and threshold algorithm are adopted to obtain the pointing data of this mid-infrared laser.The experimental results show that the maximum pointing error is 1.1 mrad and the average is 0.3 mrad at room temperature.The main reason is that the temperature control system for laser diode(LD) is not perfect and it may be improved further.The measurement results can provide references for the investigation,beam shaping,pointing measurement and stability techniques of mid-infrared lasers.