17 February 2010 CW laser operation of a highly-doped Tm:KLu(WO4)2/KLu(WO4)2 thin disk epitaxial laser
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Abstract
We demonstrate the first thin disk epitaxial Tm-laser based on the monoclinic KLu(WO4)2 with 15 at. % doping. The doped epitaxial layer serving as an active medium is only 80 μm thick. The large absorption enables efficient pumping with only a single double pass of the pump radiation from the diode-laser. For output coupling between 0.4% and 2.8 %, the slope efficiency in the continuous-wave regime is in the 7-11% range and the laser threshold is 1.5...2.5 W of absorbed pump power. The laser emission spectra are centered at ~1850, 1915 and 1940 nm for output couples of 2.8%, 1.6% and 0.4% transmission, respectively. In all cases the emission spectra are "structured", consisting of a number (typically 5...10) of narrow emission lines spread irregularly over 15...30 nm.
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Sergei Vatnik, Sergei Vatnik, Ivan Vedin, Ivan Vedin, Maria Cinta Pujol, Maria Cinta Pujol, Xavier Mateos, Xavier Mateos, Joan J. Carvajal, Joan J. Carvajal, Magdalena Aguilo, Magdalena Aguilo, Francesc Diaz, Francesc Diaz, Uwe Griebner, Uwe Griebner, Valentin Petrov, Valentin Petrov, } "CW laser operation of a highly-doped Tm:KLu(WO4)2/KLu(WO4)2 thin disk epitaxial laser", Proc. SPIE 7578, Solid State Lasers XIX: Technology and Devices, 75780E (17 February 2010); doi: 10.1117/12.841154; https://doi.org/10.1117/12.841154
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