Quantum-Noise-Limited Optical Frequency Comb Spectroscopy

Aleksandra Foltynowicz, Ticijana Ban, Piotr Masłowski, Florian Adler, Jun Ye
2011 Physical Review Letters  
We achieve a quantum-noise-limited absorption sensitivity of 1.7/times10$^{-12}$ 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 ultra-low-noise autobalancing detector. Spectra with a signal-to-noise ratio above 1000 and a resolution of 380 MHz are
more » ... 380 MHz are acquired within a few seconds. The measured absorption lineshapes are in excellent agreement with theoretical predictions.
doi:10.1103/physrevlett.107.233002 pmid:22182084 fatcat:djf5nu4tkrfdjfvojcxm44fm5q