Mid/far-infrared few-cycle-pulse emission via resonant mixing in semiconductor heterostructures

Pestov, D. S.; Belyanin, A. A.; Kocharovsky, Vl. V.; Scully, Marlan O.

doi:10.1080/09500340408231811

Cited by 6 publications

(3 citation statements)

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“…1 Two coherent nonlinear optical processes, electromagnetically induced transparency ͑EIT͒ and coherent population oscillation ͑CPO͒, have recently been successfully employed to generate slow light in hot/ cold atomic vapors 2,3 and solid-state crystals, 4,5 with much interest in extending such quantum coherence phenomena to semiconductors. [6][7][8][9] Both processes can generate a spectral window which exhibits a greatly reduced absorption. This spectral window features a steep positive material dispersion, in accordance with the Kramers-Kronig relationship, and, hence, a reduced group velocity for signal beams propagating through the medium.…”

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Ultraslow light (<200m∕s) propagation in a semiconductor nanostructure

Palinginis

Crankshaw

Sedgwick

et al. 2005

Applied Physics Letters

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We report time-domain measurements of ultraslow light propagation in a semiconductor quantum-well structure using coherent population oscillation. Delays greater than 1 ns are achieved for an amplitude-modulated optical beam propagating through a 195-nm-long active region, corresponding to group velocities less than 200 m / s. Delays can be easily varied by adjusting the intensity of the control laser. The bandwidth is suitable to delay sub-GHz modulated optical signals.

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Ultraslow light (<200m∕s) propagation in a semiconductor nanostructure

Palinginis

Crankshaw

Sedgwick

et al. 2005

Applied Physics Letters

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“…These methods allow one to generate short THz pulses with subpicosecond durations, but with rather low intensities. The nonlinear resonant mixing in semiconductor quantum-well systems, can provide short pulses, but also with very low conversion efficiency, and it works in the mid-IR rather than in THz region [27].…”

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Generation of strong short coherent terahertz pulses in gases and solids using quantum coherence

Kalugin

Rostovtsev

Kuznetsova

et al. 2007

Optical Terahertz Science and Technology

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We show that coherently driven atomic or molecular media potentially yield strong controllable short pulses of THz radiation. The method is based on excitation of maximal quantum coherence in a gas medium by optical pulses and coherent scattering of infra-red radiation to produce pulses of THz radiation. The pulses have the energies range from several nJ to µJ and time durations from several fs to ns at room temperature. PACS numbers:

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Generation of femtosecond mid/far-infrared pulses in quantum-well heterostructures under femtosecond laser pumping

Belyanin

Kocharovsky

Kocharovsky³

et al.

CLEO/Europe. 2005 Conference on Lasers and Electro-Optics Europe, 2005.

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We propose to use the resonant nonlinear-wave mixing due to the second-order electron (hole) nonlinearity in the semiconductor asymmetric quantum wells under a femtosecond optical pulse excitation for the generation of the utmost short mid/far-infrared pulses with a fewor even single-cycle duration defined by the pump duration [1,2]. Based on the well-known investigations of the ultrafast coherence relaxation dynamics of the electron and hole states in multiple quantum-well heterostructures, we find a special case of the resonant difference-frequency mixing (within the bandwidth of the pump femtosecond pulse) when the system is left unexcited at the end of the pump pulse. In this case, in the frame of a simple three-level model of step or double quantum wells, the mid/far-infrared coherence excitation may be described analytically. The schematics is given in the Figure for a step quantum well, an essential point being that the mean frequency of the pump pulse is close to the frequencies of the interband transitions, and the width of the pump pulse spectrum is large enough to span the difference between them.On the basis of the analytical solution for a simple Hl-shaped optical pump pulse, we find that one can expect the generation of the utmost short mid/far-infrared pulses with a fewor even single-cycle duration if the proper adjustment of the pump pulse parameters is done. The results of numerical simulations with a finite coherence relaxation included demonstrate that, for typical parameters of Al(ln)GaAs heterostructures, one will get the system to be almost in the initial state, i.e., the coherence oscillations will stop, as soon as the pump pulse ends. We show that an essential shortening of the generated mid/far-infrared pulse due to cut-off of the afterglow rings of the intersubband coherence is quite general effect that takes place for any other smoothly-shaped pump pulse, if its duration and amplitude satisfy a special relation.We analyze emission of the mid/far-infrared pulses for the planar multiple quantum-well structure optically pumped at the Brewster's angle. The explicit formula for the mid/far-infrared electric field is derived, and its peak value is estimated as I V/m (for the Al(ln)GaAs heterostructures) that is high enough for many applications, in particular, in the THz frequency range. Conduction bandFemtosecond 3 pump pulse Generated mid/far-infrared pulse Valence band A schematic diagram of the three-level system with two electron and one hole levels. The mean frequency of the pump pulse, two dipole allowed interband transitions, and one dipole allowed intersubband transition are shown by arrows.

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Mid/far-infrared few-cycle-pulse emission via resonant mixing in semiconductor heterostructures

Cited by 6 publications

References 20 publications

Ultraslow light (<200m∕s) propagation in a semiconductor nanostructure

Ultraslow light (<200m∕s) propagation in a semiconductor nanostructure

Generation of strong short coherent terahertz pulses in gases and solids using quantum coherence

Generation of femtosecond mid/far-infrared pulses in quantum-well heterostructures under femtosecond laser pumping

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Mid/far-infrared few-cycle-pulse emission via resonant mixing in semiconductor heterostructures

Cited by 6 publications

References 20 publications

Ultraslow light (&lt;200m∕s) propagation in a semiconductor nanostructure

Ultraslow light (&lt;200m∕s) propagation in a semiconductor nanostructure

Generation of strong short coherent terahertz pulses in gases and solids using quantum coherence

Generation of femtosecond mid/far-infrared pulses in quantum-well heterostructures under femtosecond laser pumping

Contact Info

Product

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Ultraslow light (<200m∕s) propagation in a semiconductor nanostructure

Ultraslow light (<200m∕s) propagation in a semiconductor nanostructure