TY - JOUR KW - pfc AU - A. Foltynowicz AU - T. Ban AU - P. Masłowski AU - F. Adler AU - Jun Ye AB - We achieve a quantum-noise-limited absorption sensitivity of 1.7×10-12  cm-1 per spectral element at 400 s of acquisition time with cavity-enhanced frequency comb spectroscopy, the highest demonstrated for a comb-based technique. The system comprises a frequency comb locked to a high-finesse cavity and a fast-scanning Fourier transform spectrometer with an ultralow-noise autobalancing detector. Spectra with a signal-to-noise ratio above 1000 and a resolution of 380 MHz are acquired within a few seconds. The measured absorption line shapes are in excellent agreement with theoretical predictions. BT - Physical Review Letters DA - 2011-11 DO - 10.1103/PhysRevLett.107.233002 N2 - We achieve a quantum-noise-limited absorption sensitivity of 1.7×10-12  cm-1 per spectral element at 400 s of acquisition time with cavity-enhanced frequency comb spectroscopy, the highest demonstrated for a comb-based technique. The system comprises a frequency comb locked to a high-finesse cavity and a fast-scanning Fourier transform spectrometer with an ultralow-noise autobalancing detector. Spectra with a signal-to-noise ratio above 1000 and a resolution of 380 MHz are acquired within a few seconds. The measured absorption line shapes are in excellent agreement with theoretical predictions. PY - 2011 SE - 233002 EP - 233002 T2 - Physical Review Letters TI - Quantum-Noise-Limited Optical Frequency Comb Spectroscopy VL - 107 ER -