Doppler-free spectroscopy with a terahertz quantum-cascade laser | Zendy

M. Wienold | Zendy; Tasmim Alam | Zendy; L. Schrottke | Zendy; H. T. Grahn | Zendy; H.-W. Hübers | Zendy

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Doppler-free spectroscopy with a terahertz quantum-cascade laser

Author(s) -

M. Wienold,

Tasmim Alam,

L. Schrottke,

H. T. Grahn,

H.-W. Hübers

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.006692

Subject(s) - laser linewidth , quantum cascade laser , optics , spectroscopy , cascade , doppler effect , terahertz radiation , laser , absorption spectroscopy , materials science , free spectral range , physics , chemistry , chromatography , quantum mechanics , astronomy

We report on the Doppler-free saturation spectroscopy of a molecular transition at 3.3 THz based on a quantum-cascade laser and an absorption cell in a collinear pump-probe configuration. A Lamb dip with a sub-Doppler linewidth of 170 kHz is observed for a rotational transition of HDO. We found that a certain level of external optical feedback is tolerable as long as the free spectral range of the external cavity is large compared to the width of the absorption line.

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