Lee Mohnkern

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Substantial increases in substrate temperature, super-saturation, and V/III ratio have dramatically improved vertical domain propagation during hydride vapour phase epitaxy of orientation-patterned gallium phosphide, leading to device-quality quasi-phasematched layer thicknesses exceeding 400 microns.
Tunable, mid-infrared radiation was obtained by frequency doubling of a continuous-wave CO(2) laser in orientation-patterned GaAs crystal. Active cooling of the crystal minimized pump-induced thermal effects, allowing generation of output powers exceeding 300 mW across the wavelength range of 4.63-4.78 μm.
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