Abstract

In this Letter, a novel technique for independent control of the phase-matched center wavelength and bandwidth (BW) is demonstrated for upconversion detection in the 2–4 μm range using a fanout lithium niobate (LN) crystal. A compact, all-semiconductor, 975 nm laser delivering 3.5 W of power is used as the pump in a single-pass upconversion configuration. A globar ($\sim 800°\mathrm{C}$) is used as the infrared test source. Continuous tuning of the detected wavelength (${\lambda }_c\text{:}2.5–3.0\mathrm{\mu m}$) and BW ($\mathrm{\Delta }{\lambda }_{\mathrm{IR}}\text{:}35–225\mathrm{nm}$) has been realized using mechanical translation and rotation, respectively, of the fanout LN crystal. A comparison between the performance of the fanout LN and a conventional periodically poled LN crystal is made. The upconverted light is detected using a commercial silicon-spectrometer. The demonstrated technique allows tailored spectral upconversion based on collinear interaction. Numerical simulations are made to complement the experimental results.

© 2019 Optical Society of America

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