AI Article Synopsis
- Ultrafast mid-infrared coherent radiation is crucial in strong-field physics, as it allows for reduced optical intensities needed for light-matter interactions compared to near-IR radiation.
- A two-stage optical parametric amplifier (OPA) has been developed using high-performance ZnGeP, producing over 50 µJ femtosecond pulses centered at 5 µm, pumped by an ultrafast 2-µm source.
- A numerical model has been created to optimize system performance by controlling various factors, potentially allowing for the production of mJ-level mid-IR ultrafast pulses with new mid-IR laser sources.
Article Abstract
Ultrafast mid-infrared (IR) coherent radiation plays an important role in strong-field physics, wherein the use of longer wavelengths has reduced the optical intensities needed to drive light-matter interactions by orders of magnitude in comparison to near-IR radiation. Optimizing parametric interactions for generation and characterization of mid-IR pulses is an enabling step for those applications. We report on the production of >50 µJ femtosecond pulses centered at 5 µm in a two-stage optical parametric amplifier (OPA) based on ZnGeP, a high-performance optical material in this spectral region. The OPA is pumped by an ultrafast 2-µm source. Amplified pulses have been characterized by parametric upconversion, enabling the use of standard silicon detectors. A numerical model of the system has been developed and tested to control dispersion, group-velocity mismatch, and off-axis parametric fluorescence. The source architecture is suitable for production of mJ-level mid-IR ultrafast pulses without the use of chirped-pulse amplification, where convenient pumping could be realized directly by mid-IR laser sources based on materials such as Cr:ZnSe or Cr:ZnS.
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| http://dx.doi.org/10.1364/OE.24.005287 | DOI Listing |
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