ER: YALO Upconversion Laser
Patent, Filed 30 Nov 95, patented 28 Oct 97
DEPARTMENT OF THE NAVY WASHINGTON DC
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A laser comprises an upconversion laser gain element made of a crystalline oxide host doped with activator ions for emitting output radiation at an output wavelength. The gain element is pumped by pumping radiation at a pumping wavelength that is longer than the output wavelength. A laser resonator comprising a reflective element and an output coupler is arranged with the gain element to resonate the output radiation. The reflective element is spaced from the output coupler by a distance approaching the radius of curvature of the reflective element or the output coupler. The pumping radiation has a waist that is substantially coincident with the waist of the output radiation within the active region of the gain element.
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