Journal of Applied Physics · 1971 · 41 citations · 8 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsOptical MaterialsOpticsFerroelectric MaterialsLaser PhysicsNonlinear Optical MaterialsNonlinear OpticsOptical Properties Of SolidsRefractive IndexFerroelectric CrystalsFerroelectric Nonlinear Optical MaterialsHarmonic GenerationLithium NiobateNonlinear Optical EffectsNonlinear Optical PropertiesOptical PropertiesPhase Matching
Crystals of composition (K2O)0.3(Li2O)0.7-x (Nb2O5)x with x in the range 0.515 to 0.55 have useful and unique nonlinear optical properties. These are transparent ferroelectric crystals having the tetragonal tungsten-bronze structure. Thus, they do not have to be detwinned, as does NaBa2Nb5O15. The dc halfwave voltage is about 1350 V at 6328 A, and the nonlinear constant d31 is 1.7d31 (LiNbO3). For x=0.515 the birefringence is very large. Thus, the phase-matching temperatures for harmonic generation without double refraction with the Nd-YAG laser is 450°C. For x=0.55, 140°C is obtained. With these crystals the GaAs injection laser emitting 0.90 μ can be phase matched above room temperature for the first time without double refraction.
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A NEW AND STABLE NONLINEAR OPTICAL MATERIAL
L. G. Van Uitert, S. Singh, H. J. Levinstein et al. · Applied Physics Letters · 1967 · 153 citations
The tungsten bronze field in the system K2O|Li2O|Nb2O5
B. A. Scott, E. A. Giess, B. L. Olson et al. · Materials Research Bulletin · 1970 · 133 citations
Natural Sciences, Materials Engineering, Materials Science +8