Accession Number : ADA192161
Title : Fast Acting Optical Beam Detection and Deflection System.
Descriptive Note : Final rept. 198-1987,
Corporate Author : UNIVERSITY COLL OF NORTH WALES BANGOR SCHOOL OF ELECTRONIC ENGINEERING SCIEN CE
Personal Author(s) : Das-Gupta, D K
PDF Url : ADA192161
Report Date : 07 Dec 1987
Pagination or Media Count : 57
Abstract : The final report gives an account of progress made in the time period of January 1983 - December 1987 on Fast Acting Optical Beam Detection and Deflection System. It has been divided into two parts, each section being self-contained. Part 1 deals with the investigation of optical detection of coherent radiations of helium-neon laser of wavelength 0.6328 micrometers with corona poled polyvinylidene fluoride (PVDF) film using its pyroelectric property. The results show that a detection time of 0.56 microsec may be achieved with PVDF pyroelectric detectors. Part 2 reports the results of acousto-optic deflection of coherent He-Ne laser radiations using a water-cell which was energized by well-poled PVDF film in the frequency range of 10 MHz-70MHz 100% deflection efficiency of the primary beam energy has been achieved with this technique at a deflection angle of 1 deg. The water cell was then replaced with a Tellurium dioxide cell which provided 84% deflection efficiency at an angle of 3 deg. Finally, the report discusses a possible effective method of simultaneous deflection and deflection of coherent laser radiations with very high efficiency using blazed diffraction grating in the wavelength range of 0.4 - 1 micrometer at angles 18 deg or more. Keywords: Optical detectors.
Descriptors : *ACOUSTOOPTICS, *DEFLECTION, *OPTICAL DETECTORS, *LASER BEAMS, ANGLES, BEAMS(RADIATION), CELLS, DETECTORS, DIOXIDES, EFFICIENCY, ENERGY, FLUORIDES, FREQUENCY, HELIUM NEON LASERS, HIGH RATE, OPTICAL DETECTION, OPTICS, POLYVINYLIDENES, PYROELECTRICITY, SYNCHRONISM, TELLURIUM, WATER, COHERENT RADIATION, GRATINGS(SPECTRA)
Subject Categories : Optical Detection and Detectors
Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE