Gain enhancement in a terahertz quantum cascade laser with parylene antireflection coatings

Rungsawang, Rakchanok; Jukam, Nathan; Maysonnave, Jean; Cavalié, P.; Madéo, Julien; Oustinov, Dimitri; Dhillon, Sukhdeep; Tignon, Jérôme; Gellie, P.; Sirtori, Carlo; Barbieri, Stefano; Beere, Harvey E.; Ritchie, D. A.

doi:10.1063/1.3562002

Cited by 16 publications

(11 citation statements)

References 16 publications

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“…Using the scattering matrix method and the multi-mode RRE model, we have investigated the influence of the key parameters on mode selection in CC THz QCLs, including the net waveguide loss, effective refractive index of the passive cavity, and the heat sink temperature of the CC device. The Lorentzian gain spectrum with peak gain factor G p at 2.795 THz and full-width-halfmaximum (FWHM) of 500 GHz [27] is applied in our simulation. Laser emission between 2.7 THz and 2.85 THz is our mode tuning range of interest.…”

Section: Resultsmentioning

confidence: 99%

Mode Selection and Tuning Mechanisms in Coupled-Cavity Terahertz Quantum Cascade Lasers

Kundu

Dean

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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We present a model for longitudinal mode competition in coupled-cavity (CC) terahertz (THz) quantum cascade lasers (QCLs) by using a scattering matrix method and multimode reduced rate equations (RREs). The dependence of the mode selection and tuning characteristics on various device parameters is systematically investigated, including the net waveguide loss, the optical length of the passive cavity, and the heat-sink temperature for different relationship between the active and passive cavity lengths. The changes in eigenmode frequencies due to variations of device parameter are calculated before solving the RREs. The mode selection and tuning results obtained from solving the nonlinear RREs could be well explained by the linear scattering matrix analysis. The mode tuning process simulated by the proposed model is compared with experimentally measured data, yielding good agreement. Comprehensive study of the influence of the key device parameters on the performance of CC THz QCLs provides potential design rules for single-mode operation with either wide frequency tunability or high stability.

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Section: Resultsmentioning

confidence: 99%

Mode Selection and Tuning Mechanisms in Coupled-Cavity Terahertz Quantum Cascade Lasers

Kundu

Dean

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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“…The radiative loss modulation induced by the CC scheme could also be used as a method to obtain integrated anti-reflection coatings at the QCL facets for the realization of THz amplifiers. 20,26 We thank Larry Coldren for providing useful information on CC lasers. We also wish to acknowledge partial financial support from the European Community under the FP7-ICT project TERACOMB, the ERC project TOSCA, and the UK Engineering and Physical Sciences Research Council.…”

Section: Fig 5 (A)mentioning

confidence: 99%

Coupled-cavity terahertz quantum cascade lasers for single mode operation

Manceau

Andronico

et al. 2014

Applied Physics Letters

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We demonstrate the operation of coupled-cavity terahertz frequency quantum-cascade lasers composed of two sub-cavities separated by an air gap realized by optical lithography and dry etching. This geometry allows stable, single mode operation with typical side mode suppression ratios in the 30-40 dB range. We employ a transfer matrix method to model the mode selection mechanism. The obtained results are in good agreement with the measurements and allow prediction of the operating frequency. V C 2014 AIP Publishing LLC.[http://dx

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“…Optical amplifiers can be categorized into two types [7]: travelingwave amplifier (TWA), where cavity feedback is minuscule [8], and Fabry-Perot amplifier (FPA), where the cavity resonance effect is prevailing and the signal is effectively trapped inside the cavity, experiencing multiple pass amplification before escaping (see Fig. 1).…”

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confidence: 99%