Narrow Bandwidth Tunable Watt Level Tm: YAP Laser using Two Etalons

Abstract

Narrow band, tunable, end pump Tm:YAP laser is demonstrated in this paper. The 35 nm wavelength tunability, ranges continuously from 1917 to 1951 nm, having a spectral linewidth of 0.15 nm FWHM. The tuning and spectral band narrowing was obtained using a pair of YAG Fabry-Perot Etalons with thicknesses of 25 and 500 μm. Watt level output power were measured along the laser tunable range. Maximum output power of 3.84 W was achieved at 1934 nm. Slope efficiency of 43.2% was calculated for an absorbed pump power of 12.1 W. The combination of the narrow bandwidth with tunability at those levels of output power, makes this laser a promising tool for bio-medical, sensing and material processing applications.