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Compact Ho:YLF-pumped ZnGeP2-based optical parametric amplifiers tunable in the molecular fingerprint regime Featured

authors
Cheng, S., Chatterjee, G., Tellkamp, F., Lang, T., Ruehl, A., Hartl, I., Miller, R.J.D.
date published
April 9, 2020
journal
Optics Letters
volume, number
45 (8)
pages
2255–2258
doi
https://doi.org/10.1364/OL.389535
abstract

We report on a compact mid-infrared laser architecture, comprising a chain of ZnGeP2ZnGeP2-based optical parametric amplifiers (OPAs), which afford a higher energy yield (∼<60µJ∼x<60µJ at 1 kHz) compared to most conventional OPA gain media transparent in the 2–8-µm wavelength range. Specifically, our OPA scheme allows ready tunability in the molecular fingerprint regime and is tailored for strong-field excitation and coherent control of both stretch and bend (or torsional) vibrational modes in molecules. The OPAs are pumped and directly seeded (via supercontinuum generation) by a 2-µm, 3-ps Ho:YLF regenerative amplifier. The compressibility of the OPA output is demonstrated by a representative measurement of the near-Gaussian temporal profile of a dispersion-compensated 105-fs idler pulse at a central wavelength of 5.1 µm, corresponding to ∼6∼6 optical cycles. Detailed numerical simulations closely corroborate the experimental measurements, providing a benchmark and a platform to further explore the parameter space for future design, optimization, and implementation of high-energy, ultrafast, mid-infrared laser schemes.