Quasi-three-level neodymium vanadate laser operation under polarized diode pumping: theoretical and experimental investigation |
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Authors: | J Gao R P Yan X J Dai X Yu L Zhang X D Wu |
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Institution: | 1. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, 215163, Jiangsu, China 2. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, 150080, China
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Abstract: | We propose a novel technique for pumping neodymium vanadate crystal in 4 F 3/2 ?? 4 I 9/2 transition with polarized diode light. With a theoretical model on quasi-three-level neodymium vanadate lasers including excited state absorption and energy transfer upconversion effects, the improvement on the laser performance of polarized pumping is evaluated. A maximum output power of 4.8 W in Nd:GdVO4 912 nm laser is achieved with the incident pump power of 21.8 W, the maximum output power increases about 85% and the slope efficiency is enhanced to 1.5 times towards the unpolarized pumping under the same condition. This technique is especially suitable for quasi-three-level systems end pumped by high-brightness fiber coupled diode sources associated with short neodymium vanadate crystals. |
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