Abstract
The proton exchange thin film lithium niobate semi-nonlinear (PETFLN-SN) waveguides are a powerful platform for second harmonic generation (SHG). However, how to simultaneously generate second harmonic light and tunable second harmonic light output in PETFLN-SN waveguides has yet to be studied. Here, we propose a PETFLN-SN waveguide, which can efficiently generate second harmonic light and simultaneously realize temperature-tunable second harmonic light output. The highest normalized conversion efficiency of the second harmonic is 122.1 %W−1cm−2 at room temperature (25.9 ℃). Moreover, the tuning slope of spectral tuning is 79 pm K−1 for a telecom-band pump. Our device shows great promise for efficient on-chip wavelength conversion to produce highly tunable coherent visible light for broad applications.
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