Compact, high-repetition-rate source for broadband sum-frequency generation spectroscopy

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Date
2017
Volume
2
Issue
6
Journal Title
Title
Series Titel
Publisher
Melville, NY : AIP Publishing
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Abstract

We present a high-efficiency optical parametric source for broadband vibrational sum-frequency generation (BB-VSFG) for the chemically important mid-infrared spectral range at 2800-3600 cm-1 to study hydrogen bonding interactions affecting the structural organization of biomolecules at water interfaces. The source consists of a supercontinuum-seeded, dual-beam optical parametric amplifier with two broadband infrared output beams and a chirped sum-frequency mixing stage providing narrowband visible pulses with adjustable bandwidth. Utilizing a pulse energy of only 60 μJ from a turn-key, 1.03-μm pump laser operating at a repetition rate of 100 kHz, the source delivers 6-cycle infrared pulses at 1.5 and 3.2 μm with pulse energies of 4.6 and 1.8 μJ, respectively, and narrowband pulses at 0.515 μm with a pulse energy of 5.0 μJ. The 3.2-μm pulses are passively carrier envelope phase stabilized with fluctuations at the 180-mrad level over a 10-s time period. The 1.5-μm beamline can be exploited to deliver pump pulses for time-resolved studies after suitable frequency up-conversion. The high efficiency, stability, and two orders of magnitude higher repetition rate of the source compared to typically employed systems offer great potential for providing a boost in sensitivity in BB-VSFG experiments at a reduced cost.

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Keywords
Frequency converters, Hydrogen bonds, Interferometry, Mixer circuits, Optical parametric amplifiers, Optical pumping, Parametric amplifiers
Citation
Heiner, Z., Petrov, V., & Mero, M. (2017). Compact, high-repetition-rate source for broadband sum-frequency generation spectroscopy. 2(6). https://doi.org//10.1063/1.4983691
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License
CC BY 4.0 Unported