Optical system of nano-level vibration measurement by laser Doppler
Through the studying on the M-Z interferometer optical system, the authors give a strict contrast analysis of influence on the steadiness of optical system about optical power, polarization state of l...
980-nm Yb-doped single-mode fiber laser and its frequency doubling with BIBO
In this paper, a single-mode 980nm Yb-doped fiber laser was studied carefully in theory and experiment. Based on the theoretical research, we chose an appropriate fiber length of 36.5 cm. In the exper...
Herewe present a new optical system for the demands oflaser detection and warning optical system which has a largefield-of-view (FOV). A staring imaging laser detecting and warning systemis formed by using 2-channel uncooled infrared focal plane detectors.In this system, the operating wavelength range is 3~5 microns,and full angle of view is up to 60 degrees.The largest aperture is 30mm and the photosensitive surface diameterof PIN photoelectric detector is line array dimension nearly 12mm.And there are also composed of narrow band filters andsignal processing system. A all reflective structure with three elementsis used in the object lens to enlarge FOV andback working range, in the head of which the negativemirror have the effect of balancing aberration and deviating rayslike a prism. And a standard hyperhemisphere immersion lens withhigh refractive index is put behind the object lens tosatisfy the receiving of a detector with smaller photosensitive surface.The analyzed results show that the image height is 60mm.It redounds to reduce the power of laser and enhancesthe distance detected.
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