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Intensity maps of the modes used in this work. The dimensions of the fabricated structure are indicated.
Phase-matching tuning curve revealing a distinct peak at with FWHM of . The peak is modulated by FP fringes of the fundamental. The phase-matching peak is shown to redshift, by the value , with increasing temperature at a rate of (inset, black dots). The gray line (inset) is the theoretical simulation. Powers shown are inside the sample.
Simulated ridge width vs phase-matching wavelength shift from the case of the slab, . For a waveguide width , fabrication-induced variation in the mask width can account for spectral broadening. Inset: comparison second-harmonic spectra at phase-matching for the slab (left) and ridge (right) cases.
Spectra of a typical input fundamental (FN), unphase-matched (SH1), and phase-matched second harmonics (SH2). The input fundamental power vs output second-harmonic power at the phase-matched wavelength has the expected slope of on a log-log plot (inset).
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