Laser range-gated viewing experiments in the eye-safe spectral region are conducted where a semiconductor based laser illuminator is associated with a corresponding image detector able to operate in high frequency and high sensitivity shutter mode. After experimental validations of the camera developed for accumulation operation, a high power semiconductor based illuminator has been designed and realized. This technology can be used to develop efficient, compact and high average power SWIR illuminators. In a first step, images of different scenes were recorded in a test tunnel and the results are compared to those recorded simultaneously with a solid state based laser illuminator working in flash mode. Both results are similar in terms of image intensity whereas semiconductor based recordings exhibits lower speckle noise and better homogeneity. In a second step, outdoor experiments were conducted during daylight conditions like full sunshine and cloudy weather and also in night conditions. No significant image degradation is measured even with longer integration time. These results underline the potential of SWIR accumulation mode for outdoor and long range active imaging applications.
Yves Lutz, Emmanuel Bacher, and Stephane Schertzer, "Shortwave infrared laser range-gated viewing based on accumulation mode," Proc. SPIE 10433, Electro-Optical and Infrared Systems: Technology and Applications XIV, 104330N (Presented at SPIE Security + Defence: September 13, 2017; Published: 6 October 2017); https://doi.org/10.1117/12.2278883.
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