An inhomogeneous theoretical model for analysis of PbSe quantum-dot-doped fiber amplifier

Bahrampour, Abbas; Rooholamini, H.; Rahimi, L.; Askari, Ali

doi:10.1016/j.optcom.2009.08.003

Cited by 25 publications

(15 citation statements)

References 32 publications

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“…Here α r is the resonant absorption coefficient and α b is the parasitic background absorption coefficient, which includes scattering loss due to the size and high permittivity of PbSe QDs. For our sample, α b 0.03 dB∕m [14]. It is well known that the purity of a semiconductor sample is a basic obstacle for laser cooling in bulk semiconductors, where transitions between extended valence and conduction bands of a direct gap semiconductor are involved in the laser cooling process.…”

Section: Resultsmentioning

confidence: 96%

“…Several years ago, colloidal PbSe QD-doped fibers were proposed for fiber amplifiers instead of Er 3 -doped fiber in the telecommunication wavelength range [12][13][14]. In these works, the emission and absorption spectra of PbSe QDs with different radii doped in a glass host have been presented.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Pure dephasing occurs due to coupling to the environment, such as phonon modes of the QD itself, surface ligands, and so on. The influence of size distribution of QDs on their spectroscopic properties has been investigated in [13,14]. Following these papers, we assume that the sizedistribution function of QDs in a sample is a Gaussian function…”

Section: Theoretical Analysismentioning

confidence: 99%

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Laser cooling with PbSe colloidal quantum dots

Nemova

Kashyap

2012

J. Opt. Soc. Am. B

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We present a theoretical scheme for laser cooling with colloidal lead-salt PbSe quantum dots (QDs) doped in a glass host. The laser cooling process is based on the anti-Stokes fluorescence in QDs. The relatively short (microsecond range) lifetime of the excited level of the PbSe QD allows the cooling process to be accelerated and new materials with higher phonon energy to be used as hosts, which are normally considered unsuitable for cooling with rare-earth ions. The considerable increase (by ∼10 4 ) in the absorption cross section of the PbSe QD in comparison with the absorption cross section of rare-earth ions doped in glasses or crystals increases the efficiency of the cooling process considerably, lowering the pump power requirements.

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Section: Resultsmentioning

confidence: 96%

Section: Theoretical Analysismentioning

confidence: 99%

Section: Theoretical Analysismentioning

confidence: 99%

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Laser cooling with PbSe colloidal quantum dots

Nemova

Kashyap

2012

J. Opt. Soc. Am. B

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“…The bistability between the two counter-propagating modes leads to a much richer dynamical behavior than commonly found in other types of semiconductor lasers. Moreover the bistability of the SRL opens up the possibility of using them in systems for all-optical switching, gating, wavelength-conversion functions, and optical memories [1][2][3][4][5][6] whereas the bidirectionality of the SRL has been widely exploited for rotation sensing applications [7,8]. SRLs do not require cleaved facets or gratings for optical feedback and are thus particularly suited for monolithic integration [9].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics in semiconductor ring lasers with negative optoelectronic and incoherent optical feedback

et al. 2014

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In this work, we study theoretically the dynamical behavior of two semiconductor ring lasers (SRLs). One is subject to negative optoelectronic feedback and the other laser is subject to incoherent optical feedback. Relying on asymptotic methods, we are able to reduce the original set of five equations used to describe the dynamical behavior of SRLs with negative optoelectronic feedback (SRL-NOEF) or incoherent optical feedback (SRL-IOF) to two equations and one map with time delay valid on time-scales longer than the relaxation oscillations (ROs). The equations of the reduced models turn out to be the same for both systems. As we vary the feedback strength, the devices under consideration in this work display both continuous wave operation and a period-doubling route to chaos. The two counter-propagating intensities of both systems exhibit in-phase chaotic behavior for small delay times comparable to the period of relaxation oscillations. For delay times significantly longer than the period of ROs, the two counter-propagating modes show in anti-phase chaotic oscillations. Moreover, for long delay times, we find that the counter-propagating intensities of both systems depict the same dynamical behaviors when their feedback strengths are increased.

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“…In 1980 a SRL including an output waveguide was designed and fabricated [9]. In recent years, SRLs have again become the topic of intense study due to their unique feature of directional bistability, which opens up the possibility of using them in systems for all-optical switching, gating, wavelength-conversion functions, and optical memories [10][11][12][13][14][15]. Also, the bidirectionality of the SRL has been widely exploited for rotation sensing applications [16,17].…”

Section: Introductionmentioning

confidence: 99%