Abstract
Room-temperature laser operation in a three-dimensional Nd-glass waveguide is reported. The waveguide was fabricated by a double-diffusion process with ion migration. A Nd-glass laser, 4 mm in length, was end-pumped at 590-nm wavelength with a pulsed Rhodamine 6G dye laser. The threshold power for the Nd-glass waveguide laser was about 18 μJ, which was nearly one-half of that for a conventional Nd-glass laser without guiding structure. The measured value of the threshold for a waveguide laser agrees with the theoretical calculation.
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