标题：Watt-Level Continuous-Wave and Black Phosphorus Passive Q-Switching Operation of Ho3+, Pr3+:LiLuF4 Bulk Laser at 2.95 mu m
作者：Nie, Hongkun; Zhang, Peixiong; Zhang, Baitao; Xu, Min; Yang, Kejian; Sun, Xiaoli; Zhang, Lianhan; Hang, Yin; He, Jingliang
作者机构：[Nie, Hongkun; Zhang, Baitao; Sun, Xiaoli; He, Jingliang] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China.; [Nie, 更多
通讯作者：Zhang, BT;Zhang, BT
通讯作者地址：[Zhang, BT]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China;[Zhang, BT]Shandong Univ, Inst Crystal Mat, Jinan 250100, 更多
来源：IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
关键词：Laser materials; mid-infrared crystal; passively Q-switched; solid-state; lasers
摘要：Efficient continuous wave (CW) and passively Q-switched Ho3+, Pr3+ : LiLuF4 (Ho, Pr:LLF) laser operating at 2.95 mu m were realized using a 1150-nm Raman fiber laser as the pump source. A CW output power as high as 1.15 W, which we believe to be the highest one ever achieved from Ho3+ -doped bulk laser emission around 3 mu m, corresponds to an optical-to-optical conversion efficiency of 14.5% and a slope efficiency of 15.5%, respectively. A high-quality saturable absorber (SA) based on multilayered black phosphorus (BP) nanosheet film deposited on a CaF2 substrate was successfully fabricated and employed. Under the absorbed pump power of 7.36 W, the shortest pulse width of 194.3 ns was obtained, which is the shortest among the two-dimensional materials as SA around 3 mu m. The results not only indicated that Ho, Pr: LLF crystal would be a promising mid-infrared (MIR) gain medium for obtaining high power output, but verified that the multilayered BP is a promising optical modulator for generating short pulses in MIR spectral range.