Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage

Amanti, Maria I.; Scalari, Giacomo; Terazzi, Romain; Fischer, M.; Beck, Mattias; Faist, J.; Rudra, A.; Gallo, Pascal; Kapon, E.

doi:10.1088/1367-2630/11/12/125022

Cited by 172 publications

(133 citation statements)

References 41 publications

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“…Showing good scaling properties, the latter designs are suitable for high power operation, 47 and the robustness in layer sequence can be utilized for broadband multi-stack devices. 48 Here, these designs are labeled as LiEL2014, 47 AmantiNJP2009, 46 and TurcinkovaAPL2011, 48 respectively. As the layer sequence of stack A in Ref.…”

Section: Hybrid Designsmentioning

confidence: 99%

Simulating terahertz quantum cascade lasers: Trends from samples from different labs

Winge

Franckié

Wacker

2016

Journal of Applied Physics

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We present a systematic comparison of the results from our non-equilibrium Green's function formalism with a large number of AlGaAs-GaAs terahertz quantum cascade lasers previously published in the literature. Employing identical material and simulation parameters for all samples, we observe that discrepancies between measured and calculated peak currents are similar for samples from a given group. This suggests that the differences between experiment and theory are partly due to a lacking reproducibility for devices fabricated at different laboratories. Varying the interface roughness height for different devices, we find that the peak current under lasing operation hardly changes, so that differences in interface quality appear not to be the sole reason for the lacking reproducibility.

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Section: Hybrid Designsmentioning

confidence: 99%

Simulating terahertz quantum cascade lasers: Trends from samples from different labs

Winge

Franckié

Wacker

2016

Journal of Applied Physics

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“…Further improvements in the CW output power can be achieved using GPH design, and utilizing higher-performing active region designs 38 . Another promising solution is to realize phase-locked arrays of GPH lasers 39 , from which much higher CW power and more directional emission is expected.…”

Section: Continuous-wave (Cw) Operation Of Gph Lasersmentioning

confidence: 99%

Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures

et al. 2012

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symmetric and antisymmetric band-edge modes exist in distributed feedback surface-emitting semiconductor lasers, with the dominant difference being the radiation loss. Devices generally operate on the low-loss antisymmetric modes, although the power extraction efficiency is low. Here we develop graded photonic heterostructures, which localize the symmetric mode in the device centre and confine the antisymmetric modes close to the laser facet. This modal spatial separation is combined with absorbing boundaries to increase the antisymmetric mode loss, and force device operation on the symmetric mode, with elevated radiation efficiency. Application of this concept to terahertz quantum cascade lasers leads to record-high peakpower surface emission ( > 100 mW) and differential efficiencies (230 mW A − 1 ), together with low-divergence, single-lobed emission patterns, and is also applicable to continuous-wave operation. such flexible tuning of the radiation loss using graded photonic heterostructures, with only a minimal influence on threshold current, is highly desirable for optimizing secondorder distributed feedback lasers.

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“…Every stack is a rescaled version of a four-quantum well longitudinal optical (LO) phonon depopulation active region. 19 In order to solve the electrical instability issues of this active region (discussed in Ref. gain section were defined by a dry etching process, selfaligned to the top Ti/Au waveguide layer.…”

mentioning

confidence: 99%

Spectral gain profile of a multi-stack terahertz quantum cascade laser

Bachmann

Rösch

Deutsch

et al. 2014

Applied Physics Letters

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The spectral gain of a multi-stack terahertz quantum cascade laser, composed of three active regions with emission frequencies centered at 2.3, 2.7, and 3.0 THz, is studied as a function of driving current and temperature using terahertz time-domain spectroscopy. The optical gain associated with the particular quantum cascade stacks clamps at different driving currents and saturates to different values. We attribute these observations to varying pumping efficiencies of the respective upper laser states and to frequency dependent optical losses. The multi-stack active region exhibits a spectral gain full width at half-maximum of 1.1 THz. Bandwidth and spectral position of the measured gain match with the broadband laser emission. As the laser action ceases with increasing operating temperature, the gain at the dominant lasing frequency of 2.65 THz degrades sharply.

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Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage

Cited by 172 publications

References 41 publications

Simulating terahertz quantum cascade lasers: Trends from samples from different labs

Simulating terahertz quantum cascade lasers: Trends from samples from different labs

Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures

Spectral gain profile of a multi-stack terahertz quantum cascade laser

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