Affiliation:
1. Max Planck Institute of Quantum Optics
2. Ludwig Maximilian University Munich
3. Center for Molecular Fingerprinting
4. University of British Columbia
5. Leibniz Institute of Photonic Technology
6. University of Regensburg
Abstract
Parametric downconversion driven by modern, high-power sources of 10-fs-scale near-infrared pulses, in particular intrapulse difference-frequency generation (IPDFG), affords combinations of properties desirable for molecular vibrational spectroscopy in the mid-infrared range: broad spectral coverage, high brilliance, and spatial and temporal coherence. Yet, unifying these in a robust and compact radiation source has remained a key challenge. Here, we address this need by employing IPDFG in a multi-crystal in-line geometry, driven by the 100-W-level, 10.6-fs pulses of a 10.6-MHz-repetition-rate, nonlinearly post-compressed Yb:YAG thin-disk oscillator. Polarization tailoring of the driving pulses using a bichromatic waveplate is followed by a sequence of two crystals, LiIO3 and LiGaS2, resulting in the simultaneous coverage of the 800-cm-1-to-3000-cm-1 spectral range (at -30-dB intensity) with 130 mW of average power. We demonstrate that optical-phase coherence is maintained in this in-line geometry, in theory and experiment, the latter employing ultra-broadband electro-optic sampling. These results pave the way toward coherent spectroscopy schemes like field-resolved and frequency-comb spectroscopy, as well as nonlinear, ultrafast spectroscopy and optical-waveform synthesis across the entire infrared molecular fingerprint region.
Funder
Max-Planck-Institut für Quantenoptik
Max Planck Technology Transfer program
Max Planck School of Photonics
Centre for Advanced Laser Applications
Max-Planck-Gesellschaft
Deutsche Forschungsgemeinschaft
Canada First Research Excellence Fund
Quantum Materials and Future Technologies Program
Natural Sciences and Engineering Research Council of Canada
Subject
Atomic and Molecular Physics, and Optics
Cited by
4 articles.
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