Judd--Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser
Yao Bao-Quan(姚宝权)a), Zheng Liang-Liang(郑亮亮)a), Yang Xiao-Tao(杨晓涛)a), Wang Tian-Heng(王天衡)a), Duan Xiao-Ming (段小明)a), Zhao Guang-Jun(赵广军)b), and Dong Qin(董勤)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 The Ho:YAP crystal is grown by the Czochralski technique. The room-temperature polarized absorption spectra of Ho:YAP crystal was measured on a c-cut sample with 1 at% holmium. According to the obtained Judd--Ofelt intensity parameters $\varOmega$2=1.42× 1020 cm2, $\varOmega$4=2.92× 1020 cm2, and $\varOmega$6=1.71× 1020 cm2, this paper calculated the fluorescence lifetime to be 6 ms for 5I7→5I8 transition, and the integrated emission cross section to be 2.24× 10-18 cm2. It investigates the room-temperature Ho:YAP laser end-pumped by a 1.91-μm Tm:YLF laser. The maximum output power was 4.1 W when the incident 1.91-μm pump power was 14.4 W. The slope efficiency is 40.8%, corresponding to an optical-to-optical conversion efficiency of 28.4%. The Ho:YAP output wavelength was centred at 2118 nm with full width at half maximum of about 0.8 nm.
Received: 19 June 2008
Revised: 05 July 2008
Accepted manuscript online:
PACS:
42.55.Rz
(Doped-insulator lasers and other solid state lasers)
Fund: Project supported by
the Program of Excellent Team in Harbin Institute of Technology of
China.
Cite this article:
Yao Bao-Quan(姚宝权), Zheng Liang-Liang(郑亮亮), Yang Xiao-Tao(杨晓涛), Wang Tian-Heng(王天衡), Duan Xiao-Ming (段小明), Zhao Guang-Jun(赵广军), and Dong Qin(董勤) Judd--Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser 2009 Chin. Phys. B 18 1009
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