Continuous-Wave Second-Harmonic Generation in Orientation-Patterned
Gallium Phosphide Waveguides at Telecom Wavelengths
Posted on 13.05.2022 - 22:08
A new process to produce orientation-patterned gallium phosphide (OP-GaP) on GaAs with almost perfectly parallel domain boundaries is presented. Taking advantage of the chemical selectivity between phosphides and arsenides, OP-GaP is processed into suspended shallow-ridge waveguides. Efficient second-harmonic generation from telecom wavelengths is achieved in both Type-I and Type-II polarisation configurations. The highest observed conversion efficiency is 200% W–1 cm–2, with a bandwidth of 2.67 nm in a 1 mm-long waveguide. The variation of the conversion efficiency with wavelength closely follows a squared cardinal sine function, in excellent agreement with theory, confirming the good uniformity of the poling period over the entire length of the waveguide.
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Pantzas, Konstantinos; Combrié, Sylvain; Bailly, Myriam; Mandouze, Raphaël; Talenti, Francesco Rinaldo; Harouri, Abdelmounaim; et al. (2022): Continuous-Wave Second-Harmonic Generation in Orientation-Patterned Gallium Phosphide Waveguides at Telecom Wavelengths. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.2c00156
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Francesco Rinaldo Talenti
Luc Le Gratiet
Alfredo De Rossi
wavelength closely followspatterned gallium phosphideii polarisation configurationswave secondtelecom wavelengthstaking advantagesuspended shallowridge waveguidespoling periodnew processharmonic generationgood uniformityexcellent agreemententire lengthefficient secondconversion efficiencychemical selectivity67 nm1 mm