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A Shack-Hartmann wavefront sensor was used to measure thermal lensing in diode-end-pumped Yb-doped GdCOB, YCOB, YSO, YAG, and KGW crystals, under lasing or nonlasing conditions. Measured thermal lenses are aberration-free, and their focal lengths under lasing action range from 40 to 140 mm for 5 W of absorbed power. When laser action was inhibited the thermal lens dioptric power was increased significantly...
We demonstrate a diode-pumped Yb-doped fiber master oscillator (Nd:YAG) power multimode amplifier. The multimode output beam is converted to singlemode by a two wave mixing process in an infrared sensitive photorefractive crystal. Up to 1 W singlemode output is achieved by compensation of thermally-induced phase fluctuations in the fiber.
Abstract. We demonstrate that Yb-doped Ca4GdO(BO3)3 (GdCOB) crystals are suitable for the development of high-power diode-pumped lasers emitting at around 1.04m. A 15%-doped Yb:GdCOB crystal was longitudinally pumped with a cw fiber-coupled diode emitting 10W at 976nm. While 5.2W of diode power was absorbed, we obtained 3.2W of 1043-m laser light, with a beam quality factor M2 equal to 3, and 2.5W...
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