ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report here new solid-solution KTiOPO4 (KTP) isomorphs, namely K1−xNbxTi1−xOPO4 and K1−xTaxTi1−xOPO4, suitable for the second-harmonic generation (SHG) of blue light. Aliovalent substitution of the Ti4+-K+ pair in KTP with Nb5+ or Ta5+ increases substantially the optical birefringence (nz−ny,x) of KTP, and blueshifts the SHG cutoff wavelengths for propagation along the x and y axes. A birefringence increase of ∼70%, and a SHG cutoff wavelength as short as 892 nm have been experimentally observed in crystals of K1−xNbxTi1−xOPO4. Detailed single-crystal x-ray structure determination reveals that the Nb substitution is ordered, with Nb strongly favoring the cis-Ti(1) sites. We discuss possible correlation between this preferential substitution and the observed compositional dependence of nonlinear susceptibilities d24, and d15. Optimal solid-solution compositions for the noncritically phase-matched frequency doubling of the 1.064 and 0.946 μm lines of Nd:YAG lasers are presented, and potential applications for these new materials are outlined.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.111549
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