- 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.