Powerful Laser Diode Matrixes for Active Vision Systems
— This article is deal with the experimental investigations of the laser diode matrixes (LDM) based on the AlGaAs/GaAs heterostructures (lasing wavelength 790-880 nm) to find optimal LDM parameters for active vision systems. In particular, the dependence of LDM radiation pulse power on the pulse duration and LDA active layer heating as well as the LDM radiation divergence are discussed.
Experimental study of all-weather NIR laser active imaging system
An all-weather NIR laser active imaging system with high power NIR pulse laser, image intensifier CCD (ICCD) camera and range-gated synchronization control technology is developed for acquiring longer detection range and high resolution image in adverse weather conditions. The system composition and working principle are introduced. The laboratory and outfield experiments have been done to validate imaging effect and imaging quality. The results show that the minimum resolution is about 5cm when observing the target far from 1200m in the dark of night and the image resolution could reach to 10cm when observing the target far from 2500m in misty condition. Furthermore, the minimum resolution is about 20cm when observing the target far from 4800m and the image is too blurred to accurately identify the target when observing the target far from 7200m in rainy condition. The system could be widely used in target reconnaissance, coastal patrol, search and rescue at sea, airports, ports, oil fields and forest fire prevention.
Experimental study of a high power and high efficiency CW diode-side-pumped Nd:YAG laser
Abstract This paper reports on the characterization of a diode-side-pumped CW Nd:YAG laser. A side-pumped configuration with 9 laser diodes is used for the laser. Pump light is directly coupled into the Nd:YAG rod without focusing lenses and the pump light distribution in the Nd:YAG rod was calculated. A maximum output power of 150 W in multimode operation is obtained for a pumping power of 400 W . The optical–optical efficiency is 37%. Output power of the laser under different output couplers, resonator lengths and temperatures of the cooling water have been studied.