We report on efficient conversion of a 1064-nm Nd:YAG laser to tunable visible light. The conversion scheme uses noncritically phase-matched second-harmonic generation of a pulsed Nd:YAG-pumped LiF:F<sub>2</sub><sup>−</sup> laser in lithium triborate. Optimization yields 42% LiF:F<sub>2</sub><sup>−</sup> laser efficiency and 56% frequency-doubling efficiency, providing >20% conversion from 1064 nm to broadly tunable visible output. A dramatic sensitivity of laser efficiency to pump pulse duration is recorded, with a fundamental efficiency improvement of over 30-fold measured for an increase in pump pulse duration from 5 to 34 ns.
© 2002 Optical Society of America
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3600) Lasers and laser optics : Lasers, tunable
(140.7300) Lasers and laser optics : Visible lasers
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
S. Maile Giffin, Glenn W. Baxter, Iain T. McKinnie, and Valerii V. Ter-Mikirtychev, "Efficient 550–600-nm Tunable Laser Based on Noncritically Phase-Matched Frequency Doubling of Room-Temperature LiF:F2- in Lithium Triborate," Appl. Opt. 41, 4331-4335 (2002)