Quasi-phase-matched second-harmonic generation in a pure crystal waveguide (PCW) is presented. A direct-bonded ridge structure with airgap boundary achieved the PCW in 3.2 µm periodically poled MgO:LiNbO3. In a single-pass configuration, CW 40 mW of blue light was generated with power conversion efficiency of 59%.
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Sugita et al. (2004) studied this question.
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