A comb-referenced difference-frequency spectrometer for cavity ring-down spectroscopy in the 4.5 µm region
Mazzotti, Davide; Cancio, Pablo; Castrillo, Antonio; Galli, Iacopo; Giusfredi, Giovanni; Natale, Paolo De; Mazzotti, Davide; CNR-INOA, Largo Fermi 6, 50125 Firenze FI, Italy ; LENS, Via Carrara 1, 50019 Sesto Fiorentino FI, Italy; Cancio, Pablo; CNR-INOA, Largo Fermi 6, 50125 Firenze FI, Italy ; LENS, Via Carrara 1, 50019 Sesto Fiorentino FI, Italy; Castrillo, Antonio; LENS, Via Carrara 1, 50019 Sesto Fiorentino FI, Italy ;; Galli, Iacopo; CNR-INOA, Largo Fermi 6, 50125 Firenze FI, Italy ; LENS, Via Carrara 1, 50019 Sesto Fiorentino FI, Italy; Giusfredi, Giovanni; CNR-INOA, Largo Fermi 6, 50125 Firenze FI, Italy ; LENS, Via Carrara 1, 50019 Sesto Fiorentino FI, Italy; Natale, Paolo De; CNR-INOA, Largo Fermi 6, 50125 Firenze FI, Italy ; LENS, Via Carrara 1, 50019 Sesto Fiorentino FI, Italy
Журнал:
Journal of Optics A: Pure and Applied Optics
Дата:
2006-07-01
Аннотация:
We present a unique spectrometer combining absolute-frequency and high-sensitivity capabilities for precise investigation of molecular ro-vibrational spectra in the mid-IR. A coherent source based on a difference-frequency generation non-linear process in a periodically poled LiNbO<sub>3</sub> crystal is referenced to an optical frequency-comb synthesizer. The generated radiation is coupled to a high-finesse Fabry–Perot cavity and the transmitted cavity ring-down signal is sensitive to very small gas absorbance. We tested the performance of our set-up on CO<sub>2</sub> transitions.
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