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
Absolute frequency stabilization of a QCL at 8.6 mu m by modulation transfer spectroscopy
Vicentini Edoardo;Coluccelli Nicola;Di Sarno Valentina;Maddaloni Pasquale;De Natale Paolo;Gianfrani Livio;Laporta Paolo;Galzerano Gianluca
2020
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 AmericaI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
