Ultrabroadband mid-infrared noncollinear difference frequency generation in a silver thiogallate crystal

Aulin, Yaroslav V.; Tuladhar, Aashish; Borguet, Eric

doi:10.1364/ol.43.004402

Ultrabroadband mid-infrared noncollinear difference frequency generation in a silver thiogallate crystal

Journal Article · Tue Sep 11 00:00:00 EDT 2018 · Optics Letters

DOI:https://doi.org/10.1364/ol.43.004402· OSTI ID:1770810

Aulin, Yaroslav V. ^[1]; ^[1]; Borguet, Eric ^[1]

Temple Univ., Philadelphia, PA (United States)

In this study, we report the generation of ultrabroadband mid-infrared (mid-IR) pulses by noncollinear difference frequency mixing. The signal and the idler output beams of an optical parametric amplifier are combined in a silver thiogallate crystal (AgGaS₂) to generate mid-infrared radiation. We show that a noncollinear geometry facilitates broadband phase matching. Spectral bandwidths up to 1750 cm^–1 were obtained at an external noncollinear angle of 4.2 deg, which is more than three times broader than in a collinear geometry. The broadband spectrum is tunable in the range of 1500–4500 cm^–1. Pulse energies up to 1 μJ were achieved. The broadband pulses were used in sum frequency generation in ZnSe and in vibrational absorption spectroscopy experiments of liquid samples.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1770810

Report Number(s):: PNNL--SA-137947

Journal Information:: Optics Letters, Journal Name: Optics Letters Journal Issue: 18 Vol. 43; ISSN 0146-9592

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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Broadband vibrational sum-frequency generation spectrometer at 100 kHz in the 950-1750 cm ⁻¹ spectral range utilizing a LiGaS ₂ optical parametric amplifier Heiner, Zsuzsanna; Wang, Li; Petrov, Valentin Optics Express, Vol. 27, Issue 11 https://doi.org/10.1364/oe.27.015289	journal	January 2019

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