Time-domain measurements of the sampling coherence of a quantum cascade laser

Maysonnave, Jean; Jukam, Nathan; Ibrahim, M. S. M.; Maussang, Kenneth; Rungsawang, Rakchanok; Madéo, Julien; Cavalié, P.; Freeman, Joshua R.; Dean, Paul; Khanna, Suraj P.; Steenson, D.P.; Linfield, Edmund H.; Davies, A. G.; Dhillon, Sukhdeep; Tignon, Jérôme

doi:10.1364/cleo_si.2012.ctu2b.5

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The saturation curves show the peak to peak value of the recorded electric field versus the applied antenna bias (seed amplitude). In case of the blue saturation curve, the QCL emission is not saturated this leads to a significant amount of amplified spontaneous emission in the laser cavity [7]. For this the gain recovery was not observed.…”

Section: Resultsmentioning

confidence: 96%

Observation of time-resolved gain dynamics in a terahertz quantum cascade laser

Markmann

Nong

Pal

et al. 2015

2015 40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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Section: Resultsmentioning

confidence: 96%

Observation of time-resolved gain dynamics in a terahertz quantum cascade laser

Markmann

Nong

Pal

et al. 2015

2015 40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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“…The demand for high-resolution, broadband, and fast spectroscopy/sensing in THz frequency range has promoted the study of THz quantum-cascade (QC) laser based frequency combs. [1][2][3][4][5] The QC material itself exhibits a broadband spectral response and octave-spanning multi-mode lasing has been demonstrated in waveguide-based THz QC-lasers, typically with mode spacings in the range of 5-20 GHz as set by the free-spectral-range (FSR). 6 Such dense multi-mode…”

Section: The Manuscriptmentioning

confidence: 99%

Multi-mode lasing in terahertz metasurface quantum-cascade VECSELs

Addamane

Reno

et al. 2021

Applied Physics Letters

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Up to now, terahertz quantum-cascade vertical-external-cavity surface-emitting lasers (QC-VECSELs) have tended to oscillate in only one or two lasing modes at a time. This is due to the fact that the interaction between all of the longitudinal external cavity modes and the QC gain material is mediated through a single metasurface resonance whose spatial overlap changes little with frequency; this suppresses spatial-hole-burning induced multi-mode operation. In this Letter, a VECSEL external cavity is demonstrated using an output coupler based upon a highresistivity silicon etalon which presents a periodic reflectance spectrum that is nearly matched with the external cavity mode spectrum. As the cavity length is varied, a systematic transition between a single/double-mode lasing regime and a multi-mode lasing regime is realized due to Vernier effect. Up to nine modes lasing simultaneously with a free-spectral-range of approximately 21 GHz is demonstrated. This result provides a path towards the multi-mode operation necessary for eventual frequency comb operation. The manuscriptThe demand for high-resolution, broadband, and fast spectroscopy/sensing in THz frequency range has promoted the study of THz quantum-cascade (QC) laser based frequency combs. [1][2][3][4][5] The QC material itself exhibits a broadband spectral response and octave-spanning multi-mode lasing has been demonstrated in waveguide-based THz QC-lasers, typically with mode spacings in the range of 5-20 GHz as set by the free-spectral-range (FSR). 6 Such dense multi-mode

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“…Other powerful demonstrations have exploited 3 rd order gratings for emission along the ridge length [7,8]. Although these techniques can extract the QCL power and engineer the far-field emission profile efficiently, they are inherently mono-frequency and not suitable for broadband emission that would be of interest to modelocking [9][10][11] or frequency comb [12] generation applications. Most broadband methods, however, have relied on manual positioning of external elements such as silicon lenses placed on the facet [13], suspended antenna structures [3] or rectangular waveguides [14].…”

Section: Introductionmentioning

confidence: 99%

Engineered far-fields of metal-metal terahertz quantum cascade lasers with integrated planar horn structures

Wang

Maussang

Kundu

et al. 2016

Conference on Lasers and Electro-Optics

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract:The far-field emission profile of terahertz quantum cascade lasers (QCLs) in metalmetal waveguides is controlled in directionality and form through planar horn-type shape structures, whilst conserving a broad spectral response. The structures produce a gradual change in the high modal confinement of the waveguides and permit an improved far-field emission profile resulting in a four-fold increase in the emitted output power. The twodimensional far-field patterns are measured at 77 K and are in agreement with 3D modal simulations. The influence of parasitic high-order transverse modes is shown to be controlled by engineering the horn structure (ridge and horn widths), allowing only the fundamental mode to be coupled out.

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Time-domain measurements of the sampling coherence of a quantum cascade laser

Cited by 3 publications

References 4 publications

Observation of time-resolved gain dynamics in a terahertz quantum cascade laser

Observation of time-resolved gain dynamics in a terahertz quantum cascade laser

Multi-mode lasing in terahertz metasurface quantum-cascade VECSELs

Engineered far-fields of metal-metal terahertz quantum cascade lasers with integrated planar horn structures

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