Study of a Custom Supergaussian Laser Resonator Using a Graded-Phase Mirror (original) (raw)

Abstract

In this thesis are presented the design, the fabrication, and the analysis of a new type of laser resonator called custom resonator, characterized by the presence of an aspherical mirror shaped to force oscillation in a particular output mode specified by the designer. Two of these resonators, included in a pulsed CO_2-TEA laser of semiconfocal geometry, are designed to generate supergaussian beams of order 4 and 6 in the fundamental mode. The graded -phase mirrors (GPM) were made by using the diamond cutting technique on a copper substrate. This particular geometry generates a large fundamental mode, which is well suited for extracting a maximum of monomode energy from the gain medium. This configuration also enables higher discrimination, which improves general characteristics and performance of the laser. A numerical model, based on an incoherent superposition of modes in a saturated gain medium, gives an adequate simulation of the observed experimental behavior.

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