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- Franckié, M., et al.
(författare)
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Two-well quantum cascade laser optimization by non-equilibrium Green's function modelling
- 2018
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 112:2
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Tidskriftsartikel (refereegranskat)abstract
- We present a two-quantum well THz intersubband laser operating up to 192 K. The structure has been optimized using non-equilibrium Green's function model. The result of this optimization was confirmed experimentally by growing, processing, and measuring a number of proposed designs. At high temperature (T > 200 K), the simulations indicate that lasing fails due to a combination of electron-electron scattering, thermal backfilling, and, most importantly, re-absorption coming from broadened states.
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| 4. |
- Peretti, R., et al.
(författare)
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Room temperature operation of a deep etched buried heterostructure photonic crystal quantum cascade laser
- 2016
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Ingår i: Laser & Photonics reviews. - : Wiley-VCH Verlagsgesellschaft. - 1863-8880 .- 1863-8899. ; 10:5, s. 843-848
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Tidskriftsartikel (refereegranskat)abstract
- High power single mode quantum cascade lasers with a narrow far field are important for several applications including surgery or military countermeasure. Existing technologies suffer from drawbacks such as operation temperature and scalability. In this paper we introduce a fabrication approach that potentially solves simultaneously these remaining limitations. We demonstrate and characterize deep etched, buried photonic crystal quantum cascade lasers emitting around a wavelength of 8.5 μm. The active region was dry etched before being regrown with semi-insulating Fe:InP. This fabrication strategy results in a refractive index contrast of 10% allowing good photonic mode control, and simultaneously provides good thermal extraction during operation. Single mode emission with narrow far field pattern and peak powers up to 0.88 W at 263 K were recorded from the facet of the photonic crystal laser, and lasing operation was maintained up to room temperature. The lasing modes emitted from square photonic crystal mesas with a side length of 550μm, were identified as slow Bloch photonic crystal modes by means of three-dimensional photonic simulations and measurements. (Figure presented.).
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| 5. |
- Peretti, R., et al.
(författare)
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Room temperature operation of a photonic crystal quantum cascade laser
- 2015
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Ingår i: Conference on Lasers and Electro-Optics Europe - Technical Digest. - : Institute of Electrical and Electronics Engineers Inc..
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Konferensbidrag (refereegranskat)abstract
- We report on design, fabrication and investigation of a buried heterostructure photonic crystal quantum cascade laser operating in the mid-IR (8.5μm) at room temperature, leading to single mode emission on a 600μm by 600μm mesa.
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