Gas spectroscopy through multimode self-mixing in a double-metal terahertz quantum cascade laser

Han, Yazhou; Partington, Jonathan R.; Chhantyal-Pun, Rabi; Henry, M.; Auriacombe, O.; Rawlings, T.; Li, L. H.; Keeley, James; Oldfield, M.; Brewster, N.; Dong, Rui; Dean, Paul; Davies, A. G.; Ellison, Brian N.; Linfield, Edmund H.; Valavanis, Alexander

doi:10.1364/ol.43.005933

Cited by 12 publications

(11 citation statements)

References 20 publications

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“…Note that the transmission spectra can be obtained simultaneously for all the laser modes by using this approach, which is much more efficient than SM spectroscopy based on single-mode lasers. 26 . The red lines are the calculated spectra based on data from the JPL molecular spectroscopy catalog 28 , and the black lines are the measured results.…”

Section: Self-mixing Gas Spectroscopymentioning

confidence: 99%

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Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser

Han

Partington

Chhantyal-Pun

et al. 2019

Terahertz Emitters, Receivers, and Applications X

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Section: Self-mixing Gas Spectroscopymentioning

confidence: 99%

“…(b) and (c) The frequency of the two highest-intensity laser modes as a function of drive current. The red lines are three-segment linear fits to the experiment data (scatters)26 .…”

mentioning

confidence: 99%

Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser

Han

Partington

Chhantyal-Pun

et al. 2019

Terahertz Emitters, Receivers, and Applications X

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“…We have demonstrated gas spectroscopy using the emission from a single-feedhorn waveguide-integrated QCL similar to that described above [6]. The radiation emitted from the feedhorn was directed through a gas-cell containing methanol vapour at 5 Torr, and reflected back through the cell into the laser cavity [ Fig.…”

Section: Multi-mode Detector-free Gas Spectroscopymentioning

confidence: 99%

Development of Terahertz Quantum-Cascade Lasers for Satellite-Borne Measurement of Key Gas Species

Valavanis¹,

Han²,

Nuttall³

et al. 2019

Conference on Lasers and Electro-Optics

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“…When the remote target is displaced, the variation of the external cavity length induces a periodic modulation of the emitted optical power and of the voltage difference across the laser terminals [16,17]. This means that the laser can simultaneously serve as source and detector, making this technique extremely attractive for many application purposes, such as spectroscopy [20] or compact optical imaging [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Although SM in Fabry Perot QCLs have been extensively studied [19][20][21][22], and employed for many application purposes, such as tomography [23], near-field imaging [24], and spectroscopy [20], RLs provide an additional major benefit. Their low spatial coherence can indeed lead to the reduction of artifacts with clear benefits for speckle-free imaging [25,26].…”

Section: Introductionmentioning

confidence: 99%

Self-mixing interferometry and near-field nanoscopy in quantum cascade random lasers at terahertz frequencies

et al. 2021

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We demonstrate that electrically pumped random laser resonators, operating at terahertz (THz) frequencies, and comprising a quantum cascade laser heterostructure, can operate as sensitive photodetectors through the self-mixing effect. We devise two-dimensional cavities exploiting a disordered arrangement of surface holes that simultaneously provide optical feedback and allow light out-coupling. By reflecting the emitted light back onto the surface with random holes pattern, and by varying the external cavity length, we capture the temporal dependence of the laser voltage, collecting a rich sequence of interference fringes that follow the bias-dependent spectral emission of the laser structure. This provides a visible signature of the random laser sensitivity to the self-mixing effect, under different feedback regimes. The latter effect is then exploited, in the near-field, to demonstrate detectorless scattering near-field optical microscopy with nanoscale (120 nm) spatial resolution. The achieved results open up possibilities of detectorless speckle-free nano-imaging and quantum sensing applications across the far-infrared.

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Gas spectroscopy through multimode self-mixing in a double-metal terahertz quantum cascade laser

Cited by 12 publications

References 20 publications

Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser

Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser

Development of Terahertz Quantum-Cascade Lasers for Satellite-Borne Measurement of Key Gas Species

Self-mixing interferometry and near-field nanoscopy in quantum cascade random lasers at terahertz frequencies

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