13 February 2008 Type II sum frequency generation in KTP waveguides: a technique for pre and post screening
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Quasi-phase matched (QPM) frequency conversion in ion exchanged potassium titanyl phosphate (KTP) waveguides can be used for highly efficient single pass conversion of low power cw and quasi-cw lasers. Applications include frequency doubling diode lasers for display and biomedical, pulsed sources for fluorescence and remote sensing, and recently KTP waveguides have been used to generate photon pairs using both Type I and II down conversion for quantum information science and technology (QUIST) applications. In this paper, we will describe a nondestructive, all optical technique that can be used to assess the quality and modal index of the ion exchanged waveguide before periodic poling. The structure of the waveguide is interrogated utilizing Type II sum frequency generation (SFG) and is enabled by the fact that the ion exchange process results in waveguides that can support both TE and TM optical modes. The results of this technique can be used to determine the uniformity of the created waveguide and are used to determine the necessary period for a desired poling result. Furthermore, this technique can be utilized to provide an in situ assessment of the poling for any QPM period without needing the laser sources for the particular frequency conversion interaction. Experimental results will be reviewed.
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Christopher M. Kaleva, Christopher M. Kaleva, Mark Munro, Mark Munro, Tony D. Roberts, Tony D. Roberts, Tiejun Chang, Tiejun Chang, Philip Battle, Philip Battle, "Type II sum frequency generation in KTP waveguides: a technique for pre and post screening", Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68751L (13 February 2008); doi: 10.1117/12.764005; https://doi.org/10.1117/12.764005

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