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ABSTRACT: Room-temperature cw second-harmonic generation from telecom wavelengths, with 30% W(-1) cm(-2) efficiency and second-harmonic power levels up to 41 mW, was achieved in buried waveguides fabricated by reverse-proton exchange in 1% MgO-doped stoichiometric lithium tantalate without any evidence of optical damage. The technology proves suitable for the realization of efficient nonlinear frequency converters and all-optical devices.
Optics Letters 02/2006; 31(1):83-5. · 3.40 Impact Factor
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ABSTRACT: We observed intensity- and phase-mismatch dependent spectral blueshifts and redshifts of ultra-short 40-fs pulses centered around 1500 nm in periodically poled stoichiometric lithium tantalate (PPSLT) bulk crystals.
Quantum Electronics Conference, 2005. EQEC '05. European; 07/2005
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ABSTRACT: Buried waveguides with nearly symmetrical refractive index profile and high homogeneity were obtained by applying the reverse-proton-exchange technique to MgO doped stoichiometric lithium tantalate, a promising nonlinear material due to its low coercive field and high damage threshold. By characterizing several samples fabricated under different experimental conditions, we identified a fabrication procedure in which the annealing and the reverse-exchange processes are performed at the same temperature, and the diffusion of hydrogen ions towards the substrate is negligible during the burial step. These fabrication conditions are simpler than the conventional ones used for lithium niobate. Accurate empirical laws were found, relating the fabrication conditions to the optical parameters.
Optics Express 07/2004; 12(12):2754-61. · 3.59 Impact Factor
