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Complex direct comb spectroscopy with a virtually imaged phased array
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DOI：10.1364/OL.41.001277.png)
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Abstract
En 中文
We demonstrate a simple interferometric technique to directly measure the complex optical transmittance over a large spectral range using a frequency-comb spectrometer based on a virtually imaged phased array. A Michelson interferometer encodes the phase deviations induced by a sample contained in one of its arms into an interferogram image. When combined with an additional image taken from each arm separately, along with a frequency-calibration image, this allows full reconstruction of the sample's optical transfer function. We demonstrate the technique with a vapor cell containing (HCN)-C-13-N-14, producing transmittance and phase spectra spanning 2.9 THz (similar to 23 nm) with similar to 1 GHz resolution. (C) 2016 Optical Society of America
Keywords:
HETERODYNE MOLECULAR-SPECTROSCOPY
LASER FREQUENCY COMB
KRAMERS-KRONIG
DISPERSION
MODE
SPECTROMETER
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