Polarization Detection is a new remote sensing technique. There is a huge potential for application in space-based imaging, material recognition and clutter suppression. This article presents a simulation study of polarization characteristics distribution and space-based polarization detection of typical materials. In order to provide technical support for space-based applications of polarization detection technique, the main technical indicators of space-based polarization detection were carded and analyzed.
An Electro-optical Q-switched Nd:YAG slab laser with a crossed misalignment Porro prism resonator for space applications has been theoretically and experimentally investigated. The phase shift induced by the combination of different wave plates and Porro prism azimuth angles have been studied for creating high loss condition prior to Q-switching. The relationship of the effective output coupling reflectivity and the employed Q-switch driving voltage is explored by using Jones matrix optics. In the experiment, the maximum output pulse energy of 93 mJ with 14-ns pulse duration is obtained at the repetition rate of 20 Hz and the optical-to-optical conversion efficiency is 16.8%. The beam quality factors are M <sup>2</sup> <sub> x </sub>= 2.5 and M <sup>2</sup><sub>y</sub> = 2.2, respectively.