We demonstrate continuous-wave cavity ring-down spectroscopy of a partially hydrodynamic molecular beam emerging from a buffer-gas-cooling source. Specifically, the (nu1+nu3) vibrational overtone band of acetylene (12C2H2) around 1.5 micron is accessed using a narrow-linewidth diode laser stabilized against a GPS-disciplined rubidium clock via an optical frequency comb synthesizer. As an example, the absolute frequency of the R(1) component is measured witha fractional accuracy of 1x10-9. Our approach represents the first step towards the extension of more sophisticated cavity-enhanced interrogation schemes, like two-photon excitation, to buffer-gas-cooled molecular beams. In this respect, a frequency-comb-referenced absolute calibration of the 13C12CH2 spectrum around 6497 cm-1 is also reported, preliminary to the implementation of a Doppler-free two-color interrogation scheme.References: L. santamaria, V. Di sarno, P. De Natale, M. De Rosa, M. Inguscio, S. Mosca, I. Ricciardi, D. Calonico, F. Levi, P. Maddaloni, Phys. Chem. Chem. Phys. 18, 16715 (2016).
Pasquale, M., Valentina Di Sarno, ., Paolo De Natale, ., Maurizio De Rosa, ., Simona, M., Iolanda, R., et al. (2017). Frequency-comb-assisted precision spectroscopy of a buffer-gas-cooled acetylene beam.
Frequency-comb-assisted precision spectroscopy of a buffer-gas-cooled acetylene beam
Filippo Tamassia;Gianfranco Di Lonardo
2017
Abstract
We demonstrate continuous-wave cavity ring-down spectroscopy of a partially hydrodynamic molecular beam emerging from a buffer-gas-cooling source. Specifically, the (nu1+nu3) vibrational overtone band of acetylene (12C2H2) around 1.5 micron is accessed using a narrow-linewidth diode laser stabilized against a GPS-disciplined rubidium clock via an optical frequency comb synthesizer. As an example, the absolute frequency of the R(1) component is measured witha fractional accuracy of 1x10-9. Our approach represents the first step towards the extension of more sophisticated cavity-enhanced interrogation schemes, like two-photon excitation, to buffer-gas-cooled molecular beams. In this respect, a frequency-comb-referenced absolute calibration of the 13C12CH2 spectrum around 6497 cm-1 is also reported, preliminary to the implementation of a Doppler-free two-color interrogation scheme.References: L. santamaria, V. Di sarno, P. De Natale, M. De Rosa, M. Inguscio, S. Mosca, I. Ricciardi, D. Calonico, F. Levi, P. Maddaloni, Phys. Chem. Chem. Phys. 18, 16715 (2016).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
