Upconversion spectral response tailoring using fanout QPM structures
Opt. Lett., vol. 44, no. 11, pp. 2847-2850 (2019).
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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 (∼800°C) is used as the infrared test source. Continuous tuning of the detected wavelength (λc:2.5-3.0µm) and BW (ΔλIR:35-225nm) 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.
1 DTU Fotonik, Technical University of Denmark, DK-4000 Roskilde, Denmark
2 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH), 12489 Berlin, Germany
(190.4360) Nonlinear optics, devices; (190.7220) Upconversion; (280.4788) Optical sensing and sensors.