Imaging simulation becomes an effective and necessary way to see how the wide-field sensor performs because design and analysis of a wide-field sensor requires a lot of rigid conditions. Here, a long-wave infrared panoramic scanning sensor is designed for small target detection. Space-based imaging simulation based on the characteristics of the panoramic scanning sensor is realized. Serial images covering 360°×10° field of view is generated. Stars, long-distance satellites, and space debris appear as point sources in the images. It is demonstrated that the panoramic scanning sensor has the capability of observing a long-distance small target and can be used for space target detection.
Vortex beams have special applications in many areas, such as quantum information processing, quantum entanglement, particles trapping and manipulation etc. A great deal of attention has been given to the research of the generating vortex beam and measuring the topological charge. This paper presents a method to measure the topological charge of vortex beams by using a cylinder Lens. Simulation and experiment results show that dark stripes appear when topological charge is non-zero, and the number of dark stripes is equal to the topological charge. Therefore our research results may be applied as a new method to analyze the topological charge of vortex beams.
Thermal effect severely limits the output power and beam quality in high-power solid-state lasers systems. In solid-state lasers, most optical elements are cylindrical, such as laser medium, mirrors, and so on. Normally, thermal analysis is deduced based on the hypothesis that just one surface is cooled while the others are adiabatic. This paper presents semi-analytical formula of steady-state temperature field distribution, based on the hypothesis that both side surface and one end surface are cooled with different coefficients of heat transfer. Simulation results with Ansys confirmed the correctness of the above formula. The results are helpful to the study of thermal effect in disc laser, rod laser and reflective mirrors in high-power laser system.
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