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Pulse delay and speed-up of ultra fast pulses in an absorbing quantum well medium

Per Lunnemann, Mike van der Poel, Kresten Yvind +1 more

Slow down and speed-up of 180 fs pulses in an absorbing semiconductor beyond the existing models is observed. Cascading gain and absorbing sections give us significant temporal pulse shifting at almost constant output pulse energy.

Conference on Lasers and Electro-OpticsMay 1, 20081 citation

Control of ultrafast pulse propagation in semiconductor components

Mike van der Poel, Per L. Hansen, Jesper Mørk

Time shifting of optical pulses with duration in the range from 100 fs to a few ps represents one extreme of slow light, where THz bandwidth for the slow down or speed up is necessary. The physics of the time shifting of such very short pulses involves the gain saturation of the optical medium and is different from the slow-light mechanisms responsible for time shifting of pulses of narrower bandwidth. Experimental and theoretical results with semiconductor components are presented, emphasizing the physics as well as the limitations imposed by the dynamical processes.Time shifting of optical pulses with duration in the range from 100 fs to a few ps represents one extreme of slow light, where THz bandwidth for the slow down or speed up is necessary. The physics of the time shifting of such very short pulses involves the gain saturation of the optical medium and is different from the slow-light mechanisms responsible for time shifting of pulses of narrower bandwidth. Experimental and theoretical results with semiconductor components are presented, emphasizing the physics as well as the limitations imposed by the dynamical processes.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEJan 31, 20090 citations

True-time delay by slow light in a semiconductor waveguide with alternating amplifying and absorbing sections

F. Öhman, Jesper Mørk

Modeling of slow light in a semiconductor waveguide with alternating gain and absorption sections demonstrate an increase in time delay by concatenating segments. A true-time delay is predicted over a large bandwidth at high frequency.

Optical Amplifiers and Their ApplicationsJan 1, 20060 citations

Slow and Fast Light in an Electro-Absorber

F. Öhman, Andres Bermejo Ramirez, Salvador Sales +1 more

We demonstrate controllable and large time delay in cascaded semiconductor saturable absorbers and amplifiers. The possibility of further increasing the tuneable phase shift by utilizing field screening effects in the quantum well absorber is demonstrated.

Slow and Fast Light (SL)Jan 1, 20060 citations

Chirped quantum cascade laser induced transient gain in strongly absorbing molecular gases

GEOFFREY DUXBURY, Nigel Langford, Kenneth G. Hay

Using a mW power chirped pulse quantum cascade laser propagating in a 60 m pathlength Herriott cell, delayed rapid passage and transient gain signals have been observed in the 8 μm spectrum of acetylene.

Slow and Fast Light (SL)Jan 1, 20080 citations

Observation and theoretical verification of coherent pulse break-up in gallium arsenide quantum well waveguides

Paul A. Harten, A. Knorr, Jason P. Sokoloff +8 more

Coherent pulse propagation and pulse break-up in atomic media1 have been extensively studied. The long dephasing time in atomic media facilitates observation of these phenomena using relatively long pulses. However, such coherent processes have not yet been observed in semiconductors where the phase relaxation times are very rapid. Here we report on our experimental and theoretical investigations showing coherent pulse break-up in a semiconductor waveguide with photon energies that are off-resonance with respect to the exciton. The transmitted pulses through a multiple quantum well waveguide exhibit pulse break-up for large pulse areas and no pulse break-up for small pulse areas.Coherent pulse propagation and pulse break-up in atomic media1 have been extensively studied. The long dephasing time in atomic media facilitates observation of these phenomena using relatively long pulses. However, such coherent processes have not yet been observed in semiconductors where the phase relaxation times are very rapid. Here we report on our experimental and theoretical investigations showing coherent pulse break-up in a semiconductor waveguide with photon energies that are off-resonance with respect to the exciton. The transmitted pulses through a multiple quantum well waveguide exhibit pulse break-up for large pulse areas and no pulse break-up for small pulse areas.

International Conference on Ultrafast PhenomenaJan 1, 19920 citations

Experimental Observation of Pulse Delay and Speed-up in Cascaded Quantum Well Gain and Absorber Media

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Experimental Observation of Pulse Delay and Speed-up in Cascaded Quantum Well Gain and Absorber Media

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