Room Temperature Erbium-Doped Yttrium Vanadate (Er:YVO4) Laser and Amplifier
US Army Research Laboratory, Sensors and Electron Devices Directorate Adelphi
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I report on the use of a 976-nm, diode-pumped, erbium-doped, yttrium vanadate ErYVO4, 1603-nm laser and amplifier. In the first of 2 experiments, a 10-mm-long Er3 YVO4 slab, cut with its c-axis perpendicular to the laser cavity axis, was pumped in -polarization and lased in -polarization. The laser operated in a quasi-continuous wave regime with nearly 9-W output power and a slope efficiency of about 39 percent with respect to absorbed power. In a second demonstration, a 25-mm-long ErYVO4 slab was pumped in -polarization to amplify a -polarized 1,603-nm fiber-coupled diode source to achieve a small signal gain of 2.1 with a duty cycle of up to 25 . To the best of my knowledge, these have demonstrated the highest efficiency and highest power from an Er3 YVO4 laser and the first use of ErYVO4 as a nonresonantly pumped amplifier as pumped in the 970- to 980-nm absorption band.