Direct frequency comb spectroscopy with an 8.5 μm OPO

Iwakuni, Kana

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https://hdl.handle.net/2142/100479 Copy

Description

Title

Direct frequency comb spectroscopy with an 8.5 μm OPO

Author(s)

Iwakuni, Kana

Contributor(s)

• Ye, Jun
• Sukegawa, Takashi
• Weichman, Marissa L.
• Changala, Bryan
• Niedermeyer, Justin
• Bui, Thinh Quoc

Issue Date

2018-06-20

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

Direct frequency comb spectroscopy provides high-resolution spectra over a broad bandwidth. Its high sensitivity has also enabled real time detection for gas sensing and chemical reaction kineticsa . Previous work has focused in the near-infrared or mid-infrared (1 - 5 µm), but there are stronger absorption lines in the >5 µm wavelength region. In addition, at longer wavelengths spectral congestion is significantly reduced owing to the decreasing strength of intramolecular vibrational energy redistribution. We have developed a new frequency comb spectrometer within 8.5 – 9.5 µm. The light source is a synchronously pumped optical parametric oscillator (OPO)-based frequency comb using a 2 µm Tm fiber comb as the pump wave. In direct frequency comb spectroscopy, several options exist to read out the spectrum, such as FTIR or highly dispersive optics like a virtually-imaged phased array (VIPA)b . In this work, an immersion grating and a reflective grating are used as cross dispersers and each comb mode is mapped to a 2D image in the same way as a VIPA spectrometer. Immersion gratings have been applied in astronomy and have resolving power (λ/∆λ) exceeding 105 , which is suitable for high-resolution real-time comb spectroscopy. We report work done with this new spectrometer.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100479

DOI

10.15278/isms.2018.WA06

Copyright and License Information

Copyright 2018 Kana Iwakuni

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