TY - JOUR
T1 - Sensitive and broadband measurement of dispersion in a cavity using a Fourier transform spectrometer with kHz resolution
AU - Rutkowski, Lucile
AU - Johansson, Alexandra C.
AU - Zhao, Gang
AU - Hausmaninger, Thomas
AU - Khodabakhsh, Amir
AU - Axner, Ove
AU - Foltynowicz, Aleksandra
N1 - Funding Information:
Gang Zhao is supported by the China Scholarship Council.
Funding Information:
Swedish Research Council (2016-03593) and (621-2015-04374); Swedish Foundation for Strategic Research (ICA12-0031); and the Knut and Alice Wallenberg Foundation (KAW 2015.0159).
Publisher Copyright:
© 2017 Optical Society of America.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/9/4
Y1 - 2017/9/4
N2 - Optical cavities provide high sensitivity to dispersion since their resonance frequencies depend on the index of refraction. We present a direct, broadband, and accurate measurement of the modes of a high finesse cavity using an optical frequency comb and a mechanical Fourier transform spectrometer with a kHz-level resolution. We characterize 16000 longitudinal cavity modes spanning 16 THz of bandwidth in terms of center frequency, linewidth, and amplitude. Using the center frequencies we retrieve the group delay dispersion of the cavity mirror coatings and pure N2 with 0.1 fs2 precision and 1 fs2 accuracy, as well as the refractivity of the 3v1 + v3 absorption band of CO2 with 5 × 10-12 precision. This opens up for broadband refractive index metrology and calibration-free spectroscopy of entire molecular bands.
AB - Optical cavities provide high sensitivity to dispersion since their resonance frequencies depend on the index of refraction. We present a direct, broadband, and accurate measurement of the modes of a high finesse cavity using an optical frequency comb and a mechanical Fourier transform spectrometer with a kHz-level resolution. We characterize 16000 longitudinal cavity modes spanning 16 THz of bandwidth in terms of center frequency, linewidth, and amplitude. Using the center frequencies we retrieve the group delay dispersion of the cavity mirror coatings and pure N2 with 0.1 fs2 precision and 1 fs2 accuracy, as well as the refractivity of the 3v1 + v3 absorption band of CO2 with 5 × 10-12 precision. This opens up for broadband refractive index metrology and calibration-free spectroscopy of entire molecular bands.
UR - http://www.scopus.com/inward/record.url?scp=85029217998&partnerID=8YFLogxK
U2 - 10.1364/OE.25.021711
DO - 10.1364/OE.25.021711
M3 - Article
AN - SCOPUS:85029217998
SN - 1094-4087
VL - 25
SP - 21711
EP - 21718
JO - Optics Express
JF - Optics Express
IS - 18
ER -