نتایج جستجو برای: quantum dot laser

تعداد نتایج: 483820  

2007
Ulrich Hohenester

We study phonon-assisted dephasing in optically excited semiconductor quantum dots within the frameworks of the independent Boson model and optimal control. Using a realistic description for the quantum dot states and the phonon coupling, we demonstrate that such dephasing has a drastic impact on the coherent optical response. We employ optimal control theory to search for control strategies th...

Journal: :Optics express 2011
Deepak Sridharan Ranojoy Bose Hyochul Kim Glenn S Solomon Edo Waks

We demonstrate a reversibly tunable photonic crystal quantum dot laser using a photochromic thin film. The laser is composed of a photonic crystal cavity with a bare cavity Q as high as 4500 coupled to a high density ensemble of indium arsenide quantum dots. By depositing a thin layer of photochromic material on the photonic crystal cavities, the laser can be optically tuned smoothly and revers...

Journal: :Journal of Applied Physics 2022

In this paper, by applying generalized density-matrix equations, we explore the ultrafast dynamics of photo-generated electron–hole pairs in system composed electromagnetically coupled GaAs/AlGaAs quantum dots and reveal physics mechanism behind laser-controlled nonlinear-optical response pairs. For single-dot system, present numerical results to show transient dependence carrier occupations in...

Journal: :Optics letters 2007
Tian Yang Adam Mock John D O'Brien Samuel Lipson Dennis G Deppe

We report what is, to the best of our knowledge, the first demonstration of an edge-emitting photonic crystal nanocavity laser that is integrated with a photonic crystal waveguide. This demonstration is achieved with a double-heterostructure photonic crystal nanocavity incorporating an InAs quantum dot active region.

Journal: :Optics express 2010
Maria Ana Cataluna Daniil I Nikitichev Spiros Mikroulis Hercules Simos Christos Simos Charis Mesaritakis Dimitris Syvridis Igor Krestnikov Daniil Livshits Edik U Rafailov

We report a dual-wavelength passive mode locking regime where picosecond pulses are generated from both ground (lambda = 1263 nm) and excited state transitions (lambda = 1180 nm), in a GaAs-based monolithic two-section quantum-dot laser. Moreover, these results are reproduced by numerical simulations which provide a better insight on the dual-wavelength mode-locked operation.

2014
Nicholas G. Usechak John Schmidt Luke Lester

The gain-lever effect enhances the modulation efficiency of a semiconductor laser when compared to modulating the entire laser. This technique is investigated in a long-cavity multi-section quantum-dot laser where the length of the modulation section is varied to achieve 14:2, 15:1 and 0:16 gain-to-modulation section ratios. In this work, the gain-levered modulation configuration resulted in an...

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