Path to a 100 kHz 2D IR spectrometer based on a tunable Er fiber front endLuther, BM (Luther, Bradley m.); Guerrieri, L (Guerrieri, Luke); Hall, S (Hall, Sarah); Williams, DR (Williams, Devin r.); Krummel, AT (Krummel, Amber t.)
Optics Express, 2025, Volume 33, pp. 29815-29822.
2D mid-IR spectroscopy is a powerful tool for revealing structure and dynamics in chemical systems. Recently systems operating at 100 kHz have been shown to have improved signal to noise as compared to 1 kHz Ti:Sa systems, as well as faster collection rates allowing more challenging experiments such as 2D IR microscopy. We present a tunable, 100 kHz mid-IR source for 2D IR spectroscopy based on an Er fiber front end which allows for the generation of both pump and signal beams for a three-stage magnesium doped periodically poled lithium niobate (PPLN) optical parametric chirped pulse amplifier (OPCPA). The use of a Raman shift in a photonic crystal fiber (PCF) allows for the PPLN seed to be easily tuned from 1660 nm to 1760nm. Difference frequency generation (DFG) of the PPLN outputs in a zinc germanium phosphate (ZGP) crystal generates mid-IR outputs tunable from 4 mu m to 6.5 mu m and supporting pulse durations of 42-65 fs, respectively. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement |
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