Abstract
We report on a continuous-wave (KLuW) microchip laser with a record slope efficiency of 84%, the highest value among the holmium inband-pumped lasers, delivering 201 mW output power at 2105 nm. The Ho laser operating at room temperature on the transition is in-band-pumped by a diode-pumped Tm:KLuW microchip laser at 1946 nm. Ho:KLuW laser operation at 2061 and 2079 nm is also demonstrated with a maximum slope efficiency of 79%. The microchip laser generates an almost diffraction-limited output beam with a Gaussian profile and a . The laser performance of the -cut Ho:KLuW crystal is very similar for pump light polarizations and . The positive thermal lens plays a key role in the laser mode stabilization and proper mode-matching. The latter, together with the low quantum defect under in-band-pumping (), is responsible for the extraordinary high slope efficiency.
© 2015 Optical Society of America
Full Article | PDF ArticleMore Like This
Josep Maria Serres, Xavier Mateos, Pavel Loiko, Konstantin Yumashev, Nikolai Kuleshov, Valentin Petrov, Uwe Griebner, Magdalena Aguiló, and Francesc Díaz
Opt. Lett. 39(14) 4247-4250 (2014)
Pavel Loiko, Josep Maria Serres, Xavier Mateos, Konstantin Yumashev, Nikolai Kuleshov, Valentin Petrov, Uwe Griebner, Magdalena Aguiló, and Francesc Díaz
Opt. Express 22(23) 27976-27984 (2014)
Xavier Mateos, Venkatesan Jambunathan, Maria Cinta Pujol, Joan Josep Carvajal, Francesc Díaz, Magdalena Aguiló, Uwe Griebner, and Valentin Petrov
Opt. Express 18(20) 20793-20798 (2010)