Abstract
We report on the performance of diode-pumped Cr:LiSAF lasers with coupled optical cavities for single-frequency operation and wavelength tuning. One of these lasers consists of a 500 μm long, highly doped Cr:LiSAF crystal (one surface is HR coated, the other uncoated) and a 0.3% flat output coupler positioned at a distance of 10 μm from the uncoated crystal surface. Pumped by 30 mW of 670 nm diode laser radiation this laser generated single-frequency radiation with a power of 5 mW and a spectral width of 3 MHz at wavelengths within the tuning range of 860 to 900 nm. A second short cavity Cr:LiSAF laser was operated with an external grating resonator. This laser produced a single-frequency output of 16 mW with a linewidth of ∼ 1 MHz. The wavelength was tunable in the range of 800–970 nm. The performance of these lasers is analyzed by characterizing the optical cavity (which is determined by the thermally induced changes of the refractive index and the unisotropic thermal expansion of the laser crystal), by integrating the relevant rate equations, and by solving the electric field equations for the coupled cavities.
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