Sensitive and broadband measurement of dispersion in a cavity using a Fourier transform spectrometer with kHz resolution

Abstract

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 cavity modes spanning 16 THz of bandwidth in terms of center frequency, linewidth, and amplitude. We retrieve the group delay dispersion of the cavity mirror coatings and pure N${}_2$ with 0.1 fs${}^2$ precision and 1 fs${}^2$ accuracy, as well as the refractivity of the 3ν1+ν3 absorption band of CO${}_2$ with 5 x 10${}^{-12}$ precision. This opens up for broadband refractive index metrology and calibration-free spectroscopy of entire molecular bands.

References in corpus (5)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• Human breath analysis via cavity-enhanced optical frequency comb spectroscopy
• Quantum-noise-limited optical frequency comb spectroscopy
• Surpassing the Path-Limited Resolution of a Fourier Transform Spectrometer with Frequency Combs
• Continuous probe of cold complex molecules with infrared frequency comb spectroscopy

Cited by in corpus (9)

• Optical Frequency Comb Fourier Transform Spectroscopy with Sub-Nominal Resolution - Principles and Implementation
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• Dual-comb cavity ring-down spectroscopy
• High Resolution Spectral Metrology Leveraging Topologically Enhanced Optical Activity in Fibers
• Quantitative modeling of complex molecular response in coherent cavity-enhanced dual-comb spectroscopy
• Broadband calibration-free cavity-enhanced complex refractive index spectroscopy using a frequency comb
• Sub-nominal resolution Fourier transform spectrometry with chip-based combs
• Line positions and intensities of the ${\nu }_1$ band of ${}^{12}$CH${}_3$I using mid-infrared optical frequency comb Fourier transform spectroscopy
• Line Positions and Intensities of the ν${}_4$ Band of Methyl Iodide Using Mid-Infrared Optical Frequency Comb Fourier Transform Spectroscopy