We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.
and Diddams, S.
Mid-IR frequency comb upconversion spectroscopy, Proc. 2010 Conf. Lasers and Electro-Optics, San Jose, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906157
(Accessed September 25, 2023)