Absolute frequency stabilization of a QCL at 8.6 mu m by modulation transfer spectroscopy
Authors: Vicentini E., Gambetta A., Coluccelli N., Di Sarno V., Maddaloni P., De Natale P., Castrillo A., Gianfrani L., Laporta P., Galzerano G.
Autors Affiliation: Politecn Milan, Dipartimento Fis, Piazza L Da Vinci 32, I-20133 Milan, Italy; CNR, Ist Foton & Nanotecnol, Piazza L Da Vinci 32, I-20133 Milan, Italy; Ist Nazl Ott CNR, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy; Ist Nazl Fis Nucl, Sez Napoli, Complesso Univ MS Angelo,Via Cintia, I-80126 Naples, Italy; Univ Campania Luigi Vanvitelli, Dipartimento Matemat & Fis, Vials Lincoln 5, I-81100 Caserta, Italy
Abstract: Modulation transfer spectroscopy is used to demonstrate absolute frequency stabilization of an 8.6-mu m-wavelength quantum cascade laser against a sub-Doppler absorption of the CHF3 molecule. The obtained spectral emission properties are thoroughly characterized through a self-referenced optical frequency comb, stabilized against either a GPS-disciplined Rb clock or a 1.54-mu m Er-fiber laser locked to a high-finesse ultra-low-expansion optical cavity. Fractional long-term stability and accuracy at a level of 4 x 10(-12) (at 100 s) and 3 x 10(-10), respectively, are demonstrated, along with an emission linewidth as narrow as 10 kHz for observation times of 0.1 s. (C) 2020 Optical Society of America
Journal/Review: OPTICS LETTERS
Volume: 45 (17) Pages from: 4948 to: 4951