Stabilized all-fiber source for generation of tunable broadband fCEO-free mid-IR frequency comb in the 7 - 9 µm range

• Published in: Optics express Vol. 27; no. 26; pp. 37435 - 37445
• Main Authors: Krzempek, Karol, Tomaszewska, Dorota, Głuszek, Aleksander, Martynkien, Tadeusz, Mergo, Paweł, Sotor, Jarosław, Foltynowicz, Aleksandra, Soboń, Grzegorz
• Format: Journal Article
• Language: English
• Published: United States 23-12-2019
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.27.037435

A compact and robust all-fiber difference frequency generation-based source of broadband mid-infrared radiation is presented. The source emits tunable radiation in the range between 6.5 µm and 9 µm with an average output power up to 5 mW at 125 MHz repetition frequency. The all-in-fiber construction of the source along with active stabilization techniques results in long-term repetition rate stability of 3 Hz per 10 h and a standard deviation of the output power better than 0.8% per 1 h. The applicability of the presented source to laser spectroscopy is demonstrated by measuring the absorption spectrum of nitrous oxide (N
O) around 7.8 µm. The robustness and good long- and short-term stability of the source opens up for applications outside the laboratory.