Mr. Eliot Geathers Profile

Eliot Geathers

Research Engineer at Pennsylvania State Univ Electro Optics Ctr

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Proceedings Article | 26 May 2011 Paper

High energy microlaser and compact MOPA transmitter

Brian Brickeen, Dave Bernot, Eliot Geathers, Joseph Mosovsky

Proceedings Volume 8039, 80391A (2011) https://doi.org/10.1117/12.883247

KEYWORDS: Oscillators, Optical amplifiers, Q switching, Crystals, Transmitters, Laser crystals, Diodes, Absorption, Nd:YAG lasers, Amplifiers

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A compact micro-oscillator incorporating a dual-bounce, grazing incidence gain module with a folded resonator cavity is presented. The gain module, previously developed for Nd:YVO4, is embodied in highly doped ceramic Nd:YAG to generate improved Q-switch performance while maintaining localized pump absorption. The cavity design utilizes a doubly folded optics path around the gain crystal to increase the intra-cavity mode for a more optimum overlap with the pump light volume produced by standard lensed laser diode bars. A modified CS-package diode mount is developed to facilitate the reduced size of the oscillator without sacrificing the ability to use a high-energy, side-pumping arrangement. The oscillator is combined with a high gain, high energy extraction VHGM amplifier to generate a transmitter source on the order of 50 mJ. Cooling for both the oscillator and amplifier modules is provided via a conductive path through the base of the package. Both devices are mounted on opposite sides of a phase-change cooling reservoir to enable self-contained, burst-mode operation. Beam shaping of the oscillator output, in preparation for injection into the amplifier, is contained in a small cut-away path on the reservoir side.

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