Abstract
Refractive-index dispersion and anisotropy were measured in tetragonal (CGSM; Ga-gehlenite) and (SLGM) single crystals at room temperature between 308 and 1064 nm. Large single crystals were grown by the Czochralski method. Bireflectance in a crystallographically oriented single-crystal prism was used for an accurate measurement of the anisotropy. CGSM is negative uniaxial. At the wavelength 632.8 nm the ordinary and the extraordinary refractive indices and were 1.7214 ± 0.0004 and 0.0112 ± 0.0001. The temperature dependence was × and . SLGM is positive uniaxial. At nm, = and . The temperature dependence was ± and . The refractive-index dispersions were fitted to a Sellmeier function. Both materials can be considered for use in nonlinear optics (frequency doubling, optical parametric oscillations).
© 1996 Optical Society of America
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