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25 May 2011High energy microlaser and compact MOPA transmitter
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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Brian K. Brickeen, Dave Bernot, Eliot Geathers, Joseph Mosovsky, "High energy microlaser and compact MOPA transmitter," Proc. SPIE 8039, Laser Technology for Defense and Security VII, 80391A (25 May 2011); https://doi.org/10.1117/12.883247