Frequency modulation spectroscopy with a THz quantum-cascade laser | Zendy

R. Eichholz | Zendy; Heiko Richter | Zendy; M. Wienold | Zendy; L. Schrottke | Zendy; R. Hey | Zendy; H. T. Grahn | Zendy; H.-W. Hübers | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Frequency modulation spectroscopy with a THz quantum-cascade laser

Author(s) -

R. Eichholz,

Heiko Richter,

M. Wienold,

L. Schrottke,

R. Hey,

H. T. Grahn,

H.-W. Hübers

Publication year - 2013

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.21.032199

Subject(s) - laser , quantum cascade laser , optics , frequency modulation , amplitude modulation , modulation (music) , materials science , terahertz radiation , spectroscopy , terahertz spectroscopy and technology , cascade , amplitude , pulse frequency modulation , dispersion (optics) , physics , pulse amplitude modulation , radio frequency , chemistry , pulse (music) , telecommunications , detector , chromatography , quantum mechanics , computer science , acoustics

We report on a terahertz spectrometer for high-resolution molecular spectroscopy based on a quantum-cascade laser. High-frequency modulation (up to 50 MHz) of the laser driving current produces a simultaneous modulation of the frequency and amplitude of the laser output. The modulation generates sidebands, which are symmetrically positioned with respect to the laser carrier frequency. The molecular transition is probed by scanning the sidebands across it. In this way, the absorption and the dispersion caused by the molecular transition are measured. The signals are modeled by taking into account the simultaneous modulation of the frequency and amplitude of the laser emission. This allows for the determination of the strength of the frequency as well as amplitude modulation of the laser and of molecular parameters such as pressure broadening.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research