Broadband tunability in the yellow–red region is obtained by use of intracavity type II second-harmonic generation of gain-switched Cr:forsterite lasers in KTiOPO<sub>4</sub> . An operating wavelength range of 67 nm, from 587 to 654 nm, is obtained. Second-harmonic energy of almost 1 mJ is achieved at a peak wavelength of 620 nm. A measured factor-of-34 enhancement in acceptance angle is obtained with broadband harmonic generation. Frequency doubling is optimized with respect to the Cr:forsterite pump and laser parameters.
© 1999 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
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.7220) Nonlinear optics : Upconversion
Shirin M. Giffin and Iain T. McKinnie, "Tunable visible solid-state lasers based on intracavity frequency doubling of Cr:forsterite in KTP," Opt. Lett. 24, 884-886 (1999)