Frequency measurement of pure rotational transitions of D<sub>2</sub>O using tunable terahertz spectrometer

Matsushima, Fusakazu; Kobayashi, Kaori; Moriwaki, Y.

doi:10.1088/1742-6596/185/1/012028

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…Among the different sources of THz radiation (multiplied frequency chains [8,9], tunable far-IR lasers [10,11], difference-frequency-generation processes [12]), in recent years THz QCLs are emerging as very promising sources not only for a practical exploitation of THz technology, but also for fundamental research, e.g. in the field of THz metrology.…”

Section: Introductionmentioning

confidence: 99%

High-Q resonant cavities for terahertz quantum cascade lasers

Campa¹,

Consolino²,

Ravaro³

et al. 2015

Opt. Express

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We report on the realization and characterization of two different designs for resonant THz cavities, based on wire-grid polarizers as input/output couplers, and injected by a continuous-wave quantum cascade laser (QCL) emitting at 2.55 THz. A comparison between the measured resonators parameters and the expected theoretical values is reported. With achieved quality factor Q ≈ 2.5 × 10(5), these cavities show resonant peaks as narrow as few MHz, comparable with the typical Doppler linewidth of THz molecular transitions and slightly broader than the free-running QCL emission spectrum. The effects of the optical feedback from one cavity to the QCL are examined by using the other cavity as a frequency reference.

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Section: Introductionmentioning

confidence: 99%

High-Q resonant cavities for terahertz quantum cascade lasers

Campa¹,

Consolino²,

Ravaro³

et al. 2015

Opt. Express

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Saturated absorption in a rotational molecular transition at 2.5 THz using a quantum cascade laser

Consolino

Campa

Ravaro

et al. 2015

Applied Physics Letters

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We report on the evidence of saturation effects in a rotational transition of CH3OH around 2.5 THz, induced by a free-running continuous-wave quantum cascade laser (QCL). The QCL emission is used for direct-absorption spectroscopy experiments, allowing to study the dependence of the absorption coefficient on gas pressure and laser intensity. A saturation intensity of 25 μW/mm2, for a gas pressure of 17 μbar, is measured. This result represents the initial step towards the implementation of a QCL-based high-resolution sub-Doppler THz spectroscopy, which is expected to improve by orders of magnitude the precision of THz spectrometers.

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Frequency measurement of pure rotational transitions of D₂O using tunable terahertz spectrometer

Cited by 2 publications

References 23 publications

High-Q resonant cavities for terahertz quantum cascade lasers

High-Q resonant cavities for terahertz quantum cascade lasers

Saturated absorption in a rotational molecular transition at 2.5 THz using a quantum cascade laser

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Frequency measurement of pure rotational transitions of D2O using tunable terahertz spectrometer

Cited by 2 publications

References 23 publications

High-Q resonant cavities for terahertz quantum cascade lasers

High-Q resonant cavities for terahertz quantum cascade lasers

Saturated absorption in a rotational molecular transition at 2.5 THz using a quantum cascade laser

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Frequency measurement of pure rotational transitions of D₂O using tunable terahertz spectrometer