Judd--Ofelt analysis of spectra and experimental evaluation of laser performance of Tm3+ doped Lu2SiO5 crystal

This paper reports that the Tm$^{3 + }$:LuTm:Lu₂SiO₅, Judd--Ofelt analysis, solid-state lasers, diode-pumpedProject supported by the Program of Excellent Team in Harbin Institute of Technology, China (Grant No 60878011).2320C, 4255R, 6170, 4260D1/6/2008 12:00:00 AMThis paper reports that the Tm$^{3 + }$:LuTm:Lu₂SiO₅, Judd--Ofelt analysis, solid-state lasers, diode-pumpedProject supported by the Program of Excellent Team in Harbin Institute of Technology, China (Grant No 60878011).2320C, 4255R, 6170, 4260D1/6/2008 12:00:00 AMThis paper reports that the Tm$^{3 + }$:LuTm:Lu₂SiO₅, Judd--Ofelt analysis, solid-state lasers, diode-pumpedProject supported by the Program of Excellent Team in Harbin Institute of Technology, China (Grant No 60878011).2320C, 4255R, 6170, 4260D1/6/2008 12:00:00 AMThis paper reports that the Tm$^{3 + }$:Lu$_{2}$SiO$_{5}$ (Tm:LSO) crystal is grown by Czochralski technique. The room-temperature absorption spectra of Tm:LSO crystal are measured on a b-cut sample with 4 at.{\%} thulium. According to the obtained Judd--Ofelt intensity parameters $\Om _{2}$=9.3155$\times $10$^{ - 20 }$\,cm$^{2}$, $\Om_{4}$=8.4103$\times $10$^{ - 20 }$\,cm$^{2}$, $\Om_{6}$=1.5908$\times $10$^{ - 20 }$\,cm$^{2}$, the fluorescence lifetime is calculated to be 2.03\,ms for $^{3}$F$_{4} \to {}^{3}$H$_{6}$ transition, and the integrated emission cross section is 5.81$\times $10$^{ - 18 }$\,cm$^{2}$. Room-temperature laser action near 2\,$\mu $m under diode pumping is experimentally evaluated in Tm:LSO. An optical-optical conversion efficiency of 9.1{\%} and a slope efficiency of 16.2{\%} are obtained with continuous-wave maximum output power of 0.67\,W. The emission wavelengths of Tm:LSO laser are centred around 2.06\,$\mu $m with spectral bandwidth of $\sim $13.6\,nm.