叙述同一光路中双激光获得共焦的原理和特点及其实现技术，并就一实例的设计结果进行评价。
The principle and property of synchronous focusing of a twin-laser in same light path and its realization technique are described. The design result is evaluated by use of a practical example.
利用四路红外非制冷焦平面探测器、大视场光学系统、窄带滤光片和信号处理系统，构成了凝视成像激光探测与告警系统。
A staring imaging laser detecting and warning system is formed by using 4-channel uncooled infrared focal plane detectors, large field optical system, narrow band filters and signal processing system.
研究结果表明：回波强度受导引头光路中光学镜头的相对孔径、摄像管靶面倾斜和离焦的影响较大；扫描激光光束的入射角等因素对回波强度也有一定的影响。
Research results show that the relative aperture of optical lens, the incline and defocusing of reflection plane in TV seeker optical system reduce the intensity of the "cat's eye" reflection.
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