Continuous-wave optical parametric oscillators for mid-infrared spectroscopy

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http://hdl.handle.net/10138/324434

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Vainio , M 2020 , Continuous-wave optical parametric oscillators for mid-infrared spectroscopy . in PG Schunemann & KL Schepler (eds) , NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XIX . Proceedings of SPIE , vol. 11264 , SPIE - the international society for optics and photonics , Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XIX , San Francisco , Canada , 03/02/2020 . https://doi.org/10.1117/12.2548711

Title: Continuous-wave optical parametric oscillators for mid-infrared spectroscopy
Author: Vainio, Markku
Editor: Schunemann, PG; Schepler, KL
Contributor: University of Helsinki, Department of Chemistry
Publisher: SPIE - the international society for optics and photonics
Date: 2020
Language: eng
Number of pages: 8
Belongs to series: NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XIX
Belongs to series: Proceedings of SPIE
URI: http://hdl.handle.net/10138/324434
Abstract: The atmospheric window at 3 to 5 mu m is one of the most important spectral regions for molecular spectroscopy. This region accommodates strong fundamental vibrational spectra of several interesting molecules, including species relevant for air quality monitoring, medical diagnostics, and fundamental research. These applications require excellent spectroscopic sensitivity and selectivity. For example, atmospheric research often needs precise quantification of trace gas fractions of down to the parts-per-trillion level (10(-12)), with the capability of resolving individual spectral features of different molecular compounds. This sets stringent requirements for the light source of the spectrometer in terms of output power, noise, and linewidth. In addition, the wavelength tuning range of the light source needs to be large, preferably over the entire atmospheric window, in order to enable measurements of molecular fingerprints of several compounds. Continuous-wave optical parametric oscillators (CW-OPOs) are one of the few light sources that have the potential of combining all these favorable characteristics. This contribution summarizes our progress in the development of CW-OPOs, with an emphasis on precise frequency control methods for high-resolution molecular spectroscopy. Examples of new applications enabled by the advanced CW-OPO technologies will be presented. These examples include a demonstration of world-record detection sensitivity in trace gas analysis, as well as the first characterization of infrared spectrum of radioactive methane (CH4)-C-14.
Subject: Nonlinear optics
optical frequency conversion
infrared spectroscopy
molecular spectroscopy
FREQUENCY-COMB
PHOTOACOUSTIC-SPECTROSCOPY
STABILITY
114 Physical sciences
116 Chemical sciences
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