نتایج جستجو برای: quantum dot laser

تعداد نتایج: 483820  

Journal: : 2023

We propose an approach for encoding and transmitting information based on the use of a quantum dot laser, which, depending injection current, emits either one two or simultaneously spectral components, with different wavelengths. When laser is modulated by each lasing line detected independent photodiode, thus encoded both intensity its wavelength. Keywords: lasers, two-state lasing, multilevel...

Journal: :Physical review letters 2015
Neill Lambert Franco Nori Christian Flindt

We predict a bistability in the photon emission from a solid-state single-atom laser comprising a microwave cavity coupled to a voltage-biased double quantum dot. To demonstrate that the single-atom laser is bistable, we evaluate the photon emission statistics and show that the distribution takes the shape of a tilted ellipse. The switching rates of the bistability can be extracted from the ele...

Journal: :journal of sciences islamic republic of iran 0

a quantum theory of a two and three-level laser with injected atomic coherence is developed by using a density operator method, to the best of our knowledge, for the first time. the initial atomic coherence plays an essential role. at steady state, the equation of motion for the density operator yields to exhibit laser without inversion and a phase locking but no threshold for the laser field. ...

Journal: :international journal of nano dimension 0
h. rasooli saghai department of electrical engineering,college oftechnical& engineering, tabriz branch , islamic azad university , tabriz, iran. s.k. seyyedi sahbari department of electrical engineering,college oftechnical& engineering, tabriz branch , islamic azad university , tabriz, iran. s. zabihi agdam department of electrical engineering,college oftechnical& engineering, tabriz branch , islamic azad university , tabriz, iran.

in order to implement an integrated optical quantum circuit, designing waveguides based on the quantum box is of prime importance. to do this we have investigated optical waveguide both with and without optical pumping. the rate of absorption and emission using an array of algaas/gaas quantum box core/shell structure in the optical waveguide with various pumping intensities has computed. by con...

Journal: :international journal of nano dimension 0
a. azari department of electrical engineering, islamic azad university-tabriz branch, tabriz, iran. s.k. seyyedi department of electrical engineering, islamic azad university-tabriz branch, tabriz, iran. k. khaffafi department of electrical engineering, islamic azad university-tabriz branch, tabriz, iran. s. zabihi department of electrical engineering, islamic azad university-tabriz branch, tabriz, iran.

while the application of optical and photonic technologies in the communications, computing, medicine and industrial manufacturing has been growing rapidly, the miniaturization of these technologies has been slow due to the limitation on the diffraction. however, the developments of nanoscale components and guiding methods are continuing with a rapid pace. since waveguiding is a fundamental iss...

Journal: :journal of nanostructures 2014
h. rezagholipour dizaji p. parand

in this report, we present a facile approach for the synthesis of luminescent cds and cds:mn+2 nanocrystals by reaction of cdso4 and na2s2o3 in the presence of thioglycerol (c3h8o2s) as capping agent. the influence of various experimental variables including, ph values and percentage of dopant, on the growth rate and optical properties of the obtained cds nanocrystals has been systematically in...

2012
J. Kim A. Ardey P. J. Delfyett

An optical pulse injection locking technique is employed to generate shorter pulses from a passively modelocked quantum dot laser. The optical pulse injection locking enables the coherent addition of phaselocked longitudinal mode groups from two separate modelocked lasers without the use of stabilisation control loops, thus increasing the spectral bandwidth output resulting in optical pulses wi...

Journal: :journal of nanostructures 2013
m. mazloum-ardakani m. yavari a. r. khoshroo

colloidal quantum dots offer broad tuning of semiconductor band structure via the quantum size effect. in this paper, we present a detailed investigation on the influence of the thickness of colloidal lead sulfide (pbs) nanocrystals (active layer) to the photovoltaic performance of colloidal quantum dot solar cells. the pbs nanocrystals (qds) were synthesized in a non-coordinating solvent, 1-oc...

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