An intracavity image upconversion system, using a proustite crystal and a flashlamp-pumped dye laser, is described. Experimental results regarding the spatial resolution of the system are also presented, and the conversion efficiency is discussed.
Application of Twyman–Green interferometry is extended to achieve semi‐quantitative assessment of optical qualities of a nonlinear crystal. Interferograms of a proustite crystal are analyzed and effects of crystal imperfections on the conversion efficiency of a parametric upconversion system are evaluated.
A laser synchronization circuit, applicable to (optical) sum or difference frequency generation systems, is described. The laser synchronizer has yielded excellent results in preventing damage to the mixing crystal of an infrared-to-visible parametric upconverter.
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