Judd--Ofelt analysis of spectra and experimental evaluation of laser performance of Tm3+ doped Lu2SiO5 crystal
Yao Bao-Quan(姚宝权)a)† , Zheng Liang-Liang(郑亮亮)a), Duan Xiao-Ming(段小明)a), Zhao Guang-Jun(赵广军)b), and Zong Yan-Hua(宗艳花)b)
a National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China; b R &D Center for Laser and Opto-Electronic Materials, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract This 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 $\varOmega _{2}$=9.3155$\times $10$^{ - 20 }$ cm$^{2}$, $\varOmega_{4}$=8.4103$\times $10$^{ - 20 }$ cm$^{2}$, $\varOmega_{6}$=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.
Received: 04 December 2007
Revised: 06 January 2008
Accepted manuscript online:
(Doped-insulator lasers and other solid state lasers)
Fund: Project supported by the Program of
Excellent Team in Harbin Institute of Technology, China (Grant No 60878011).
Cite this article:
Yao Bao-Quan(姚宝权), Zheng Liang-Liang(郑亮亮), Duan Xiao-Ming(段小明), Zhao Guang-Jun(赵广军), and Zong Yan-Hua(宗艳花) Judd--Ofelt analysis of spectra and experimental evaluation of laser performance of Tm3+ doped Lu2SiO5 crystal 2008 Chin. Phys. B 17 3635
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