Wavelength-swept optical parametric oscillator for broadband mid-infrared spectroscopy |
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Authors: | A Silva I D Lindsay |
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Institution: | 1. H H Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
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Abstract: | In this work we describe a wavelength-swept continuous-wave optical parametric oscillator (OPO) for the rapid acquisition of mid-infrared spectra spanning over hundreds of wavenumbers. Rapid tuning of a ytterbium-doped fibre pump laser resulted in the OPO idler tuning over 900 cm?1 in 3.36 ms at a resolution of 4.5 cm?1, within a total accessible range of 2.67 to 4.34 μm (2304–3752 cm?1). Predictable tuning characteristics allowed simple online calibration of recorded spectra for absolute mid-infrared frequency. The system thus offers a viable approach to broadband spectral acquisition in applications requiring high-radiance illumination. |
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