Neodymium concentration dependence of 0.94-, 1.06- and 1.34-μm laser emission and of heating effects under 809- and 885-nm diode laser pumping of Nd:YAG |
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| Authors: | N Pavel V Lupei J Saikawa T Taira H Kan |
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| Institution: | (1) Laser Research Center, National Institutes of Natural Sciences, Institute for Molecular Science, Okazaki 444-8585, Japan;(2) Solid-State Quantum Electronics Laboratory, National Institute for Laser, Plasma and Radiation Physics, Bucharest, 76900, Romania;(3) Central Research Laboratory, Hamamatsu Photonics, K.K., 5000 Hirakuchi, Hamakita, Shizuoka 434-8601, Japan |
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| Abstract: | Laser emission in the 0.94-, 1.06- and 1.34-micron ranges in diluted and concentrated Nd:YAG crystals longitudinally pumped by a 885-nm diode laser on the 4
I
9/2→4
F
3/2 transition is investigated. Continuous-wave operation at watt level in all these wavelength ranges is demonstrated with a 1.0-at. % Nd:YAG crystal; however, the laser performance is impeded by the low pump absorption efficiency. Improved output power and overall efficiency were obtained with a highly doped 2.5-at. % Nd:YAG crystal: 5.5 W at 1.06 μm and 3.8 W at 1.34 μm with 0.38 and 0.26 efficiencies, respectively. Comparative results with traditional pumping at 809 nm into the highly absorbing 4
F
5/2 level are presented, showing the advantage of the direct 4
F
3/2 pumping. The influence of the lasing wavelength and of the Nd concentration on the thermal effects induced by the optical pumping in the laser material is discussed. A clear relation between the heat generated in the Nd:YAG crystals in lasing and non-lasing regimes, a function of the Nd doping, is demonstrated. PACS 42.55.Rz; 42.60.By; 42.60.Da |
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