title: Ho:YAG absorption cross sections from 1700 to 2200 nm at 83, 175, and 295 K.
abstract: We have obtained absorption spectroscopic cross sections as a function of wavelength for the laser material Ho:YAG at 295, 175, and 83 K, in the spectral range from 1700 to 2200 nm. The absorption range corresponds to (5)I8-(5)I7 transitions from the ground state to the first excited state amenable to direct pumping by laser diodes and Tm fiber lasers. The data allow a direct comparison of the absorption cross-section intensities and linewidths as temperature is lowered from room temperature to cryogenic temperatures. Universal absorption curves and numerical tables are presented for pump sources that are assumed to have a gaussian spectral lineshape, as a function of center wavelength, bandwidth, and optical density (doping density×penetration depth), at 295 and 83 K. Curves and tables are presented for both 295 and 83 K and may be used to optimize the pump absorption and laser efficiency.
authors.affiliation: Snake Creek Lasers, LLC, Hallstead, Pennsylvania 18822, USA. dbrown@snakecreeklasers.com
authors.forename: David C
authors.initials: DC
authors.lastname: Brown
authors.forename: Victoria
authors.initials: V
authors.lastname: Envid
authors.forename: Jason
authors.initials: J
authors.lastname: Zembek