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Quasi-phase-matched generation of tunable blue light in a quasi-periodic structure

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Abstract

We present what is to our knowledge a new approach to generating tunable blue light by cascaded nonlinear frequency conversion in a single LiTaO3 crystal. Simultaneous quasi-phase matching of an optical parametric generation process and a sum-frequency mixing process is achieved by means of structuring the crystal with a quasi-periodic optical superlattice. The spectral (wavelength tuning and bandwidth) and power characteristics of the blue-light generation are studied with a fixed-wavelength 532-nm picosecond laser and a wavelength-tunable nanosecond optical parametric oscillator (OPO) as the pump sources. By tuning the OPO wavelength, we could tune the blue output over 20 nm. Temperature tuning of the blue output at a fixed pump wavelength of 532 nm was limited to 1.5 nm. A maximum blue power of 15 µW was generated at a pump power of 0.5 mW, corresponding to an efficiency of 3%.

© 2004 Optical Society of America

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