Robust, fast and sensitive near-infrared continuous-filtering Vernier spectrometer

Chuang Lu, Francisco Senna Vieira, Aleksander Głuszek, Isak Silander, Grzegorz Sobon, Aleksandra Foltynowicz (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


We present a new design of a robust cavity-enhanced frequency comb-based spectrometer operating under the continuous-filtering Vernier principle. The spectrometer is based on a compact femtosecond Er-doped fiber laser, a medium finesse cavity, a diffraction grating, a custom-made moving aperture, and two photodetectors. The new design removes the requirement for high-bandwidth active stabilization present in the previous implementations of the technique, and allows scan rates up to 100 Hz. We demonstrate the spectrometer performance over a wide spectral range by detecting CO2 around 1575 nm (1.7 THz bandwidth and 6 GHz resolution) and CH4 around 1650 nm (2.7 THz bandwidth and 13 GHz resolution). We achieve absorption sensitivity of 5 × 10−9 cm−1 Hz−1/2 at 1575 nm, and 1 × 10−7 cm−1 Hz−1/2 cm−1 at 1650 nm. We discuss the influence of the scanning speed above the adiabatic limit on the amplitude of the absorption signal.

Original languageEnglish
Pages (from-to)30155-30167
Number of pages13
JournalOptics Express
Issue number19
Publication statusPublished - 13 Sept 2021
MoE publication typeA1 Journal article-refereed


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