Improvement of Laser Beam Profile Using Optical Fiber for Laser Pulse Thermal Diffusivity Measurements
Beam profiles of a YAG-laser, which was used as a pulse heat source of a laser pulse apparatus were measured with two methods. One is a two-dimensional profile measurement using a TV camera. Another is a new application of a thermographic technique to measure one-dimensional energy distributions of pulsed laser beams. Observed profiles of direct beams from the YAG-laser were too irregular to apply to a precise thermal diffusivity measurement by the laser pulse method. It was demonstrated that such irregular beams were converted to uniform beams after transmission through a step-index optical fiber.
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