Broadband terahertz dispersion control in hybrid waveguides

Fobbe, Tobias; Markmann, Sergej; Fobbe, F.; Hekmat, Negar; Nong, Hanond; Pal, Shovon; Balzerwoski, Patrick; Savolainen, Janne; Havenith, Martina; Wieck, A. D.; Jukam, Nathan

doi:10.1364/oe.24.022319

Cited by 10 publications

(7 citation statements)

References 43 publications

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“…(Unstable pulses as shorts as 3ps with narrower bandwidth QCLs have been generated previously when a QCL is not mode locked). THz dispersion management has also been considered for passive waveguides …”

Section: Dispersion Compensation and Gtimentioning

confidence: 99%

Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser

Wang

Nong

Fobbe

et al. 2017

Laser & Photonics Reviews

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International audienceDispersion compensation is vital for the generation of ultrashort and single cycle pulses from modelocked lasers across the electromagnetic spectrum. It is typically based on addition of an extra dispersive element to the laser cavity that introduces a chromatic dispersion opposite to that of the gain medium. To date, however, no dispersion compensation schemes have been successfully applied to terahertz (THz) quantum cascade lasers for short and stable pulse generation in the THz range. In this work, a monolithic on-chip compensation scheme is realized for a modelocked QCL, permitting THz pulses to be considerably shortened from 16ps to 4ps. This is based on the realization of a small coupled cavity resonator that acts as an 'off resonance' Gires-Tournois interferometer (GTI), permitting large THz spectral bandwidths to be compensated. This novel application of a GTI opens up a direct and simple route to sub-picosecond and single cycle pulses in the THz range from a compact semiconductor source

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Section: Dispersion Compensation and Gtimentioning

confidence: 99%

Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser

Wang

Nong

Fobbe

et al. 2017

Laser & Photonics Reviews

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“…It is for this reason there has been a flurry of activity in the dispersion engineering of QCL cavities, first in the THz [9] and more recently in the mid-infrared [17]. Many dispersion compensation schemes have now been demonstrated, including double-chirped mirrors [9,18,19] and other geometries [17,20].…”

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confidence: 99%

Dispersion dynamics of quantum cascade lasers

Burghoff¹,

Yang²,

Reno³

et al. 2016

Optica

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A key parameter underlying the efficacy of any nonlinear optical process is group velocity dispersion. In quantum cascade lasers (QCLs), there have been several recent demonstrations of devices exploiting nonlinearities in both the mid-infrared and the terahertz. Though the gain of QCLs has been well studied, the dispersion has been much less investigated, and several questions remain about its dynamics and precise origin. In this work, we use time-domain spectroscopy to investigate the dispersion of broadband terahertz QCLs, and demonstrate that contributions from both the material and the intersubband transitions are relevant. We show that in contrast to the laser gain-which is clamped to a fixed value above lasing threshold-the dispersion changes with bias even above threshold, which is a consequence of shifting intersubband populations. We also examine the role of higher-order dispersion in QCLs and discuss the ramifications of our result for devices utilizing nonlinear effects, such as frequency combs.

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“…Pseudo Wigner-Ville distributions [22][23][24][25] and their modifications are actively used in various fields, such as the dispersion analysis of waveguides [26] and studying oil-in-water flow patterns [27]. We note that various time-frequency filters are employed for eliminating cross-terms in the Wigner-Ville distribution, which is of high importance for the analysis of non-stationary systems.…”

Section: Tomographic Analysismentioning

confidence: 99%

Tomographic and entropic analysis of modulated signals-=SUP=-*-=/SUP=-

Mastiukova

Gavreev

Kiktenko

et al. 2020

Журнал Технической Физики

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We study an application of the quantum tomography framework for the time-frequency analysis of modulated signals. In particular, we calculate optical tomographic representations and Wigner-Ville distributions for signals with amplitude and frequency modulations. We also consider time-frequency entropic relations for modulated signals, which are naturally associated with the Fourier analysis. A numerical toolbox for calculating optical time-frequency tomograms based on pseudo Wigner-Ville distributions for modulated signals is provided.

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Broadband terahertz dispersion control in hybrid waveguides

Cited by 10 publications

References 43 publications

Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser

Short Terahertz Pulse Generation from a Dispersion Compensated Modelocked Semiconductor Laser

Dispersion dynamics of quantum cascade lasers

Tomographic and entropic analysis of modulated signals-=SUP=-*-=/SUP=-

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