Judd-Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser

• 来源期刊: 中国物理B（英文版）
• 关键词: Ho:YAlO3 solid-state lasers Judd-Ofelt analysis Tm:YLF laser ACC: 2320C 4255R 6170 4260D
• 年，卷（期）: 2009,（3）
• 页码范围: 1009-1013
• 页数: 5页
• 语种: 英文

摘要

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 Ω2 = 1.42 × 10-20cm2, Ω4 = 2.92 × 10-20cm2, and Ω6 = 1.71 × 10-20cm2, this paper calculated the fluorescence lifetime to be 6 ms for 5I7→5 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 ran with full width at half maximum of about 0.8 nm.