Broadband low-dispersion diffraction of femtosecond pulses from photorefractive quantum wells

Dinu, M.; Nakagawa, Kiyoshi; Melloch, M. R.; Weiner, Andrew M.; Nolte, David D.

doi:10.1364/josab.17.001313

Cited by 11 publications

(5 citation statements)

References 24 publications

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“…Organic photorefractive materials display significant potential for use in optical data storage, image amplification, phase conjugate mirrors, and dynamic holography. [1][2][3][4][5][6][7] Films of aligned nematic liquid crystals (LCs) doped with chromophores capable of charge separation and transport over macroscopic distances exhibit significant photorefractive effects. [8][9][10][11][12] Two coherent cw laser beams that cross within an aligned LC sample produce a light intensity grating in the material.…”

Section: Introductionmentioning

confidence: 99%

“…Organic photorefractive materials display significant potential for use in optical data storage, image amplification, phase conjugate mirrors, and dynamic holography. − Films of aligned nematic liquid crystals (LCs) doped with chromophores capable of charge separation and transport over macroscopic distances exhibit significant photorefractive effects. − Two coherent cw laser beams that cross within an aligned LC sample produce a light intensity grating in the material. Absorption of a small fraction of the light by a chromophoric electron donor or acceptor within the illuminated regions of the grating results in photoinduced electron transfer leading to the formation of radical ion pairs.…”

Section: Introductionmentioning

confidence: 99%

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Photorefractivity in Nematic Liquid Crystals Using a Donor−Acceptor Dyad with a Low-Lying Excited Singlet State for Charge Generation

Fuller

Wasielewski

2001

J. Phys. Chem. B

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The photorefractive effect was observed in room-temperature nematic liquid crystal composites consisting of a eutectic mixture of 65% 4‘-(n-pentyl)-4-cyanobiphenyl and 35% 4‘-(n-octyloxy)-4-cyanobiphenyl doped with a donor−acceptor dyad in which 9-(N-pyrrolidinyl)perylene-3,4-dicarboximide is directly linked to 1,8:4,5-naphthalenetetracarboxydiimide. This dyad has a broad, intense absorption band that extends from 500 to 750 nm. Measurements of two-beam asymmetric energy exchange (beam-coupling) and the diffraction efficiency of the refractive index grating produced in these liquid crystal thin films were carried out. A comparison is made between the covalent donor−acceptor dyad and the corresponding noncovalent donor−acceptor pair. In each case the covalent dyad outperforms the noncovalent donor−acceptor pair. The results show that aminoaryleneimides are promising new charge donating chromophores that are capable of extending photorefractive performance of nematic liquid crystal composites into the near-infrared region of the spectrum.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photorefractivity in Nematic Liquid Crystals Using a Donor−Acceptor Dyad with a Low-Lying Excited Singlet State for Charge Generation

Fuller

Wasielewski

2001

J. Phys. Chem. B

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“…Designing photorefractive quantum-well devices to have linear excitonic spectral phase is a key aspect of the design of these devices for the femtosecond applications. 20 The excitonic spectral phase also contributes a group time delay to diffracted ultrafast pulses. The pulses are delayed by an amount equal to group ϭ d/d, which is approximately 200 fs for the transverse-field photorefractive quantum wells.…”

Section: Excitonic Spectral Phasementioning

confidence: 99%

Adaptive beam combining and interferometry with photorefractive quantum wells

et al. 2001

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We present a comprehensive study of excitonic electroabsorption and two-wave mixing in photorefractive quantum wells. By combining these two measurements, we are able to determine the internal grating writing efficiency for converting an external spatial light modulation into an internal space-charge field. The internal writing efficiency at a fringe spacing ⌳ ϭ 40 m is found to be a decreasing function of applied field, varying from ϭ 0.4 at low fields to 0.2 at 12 kV/cm. The two-wave mixing efficiency in the quantum wells exceeds 40% and is used for adaptive beam combining and laser-based ultrasound detection. The quantum wells balance the hot-electron-induced photorefractive phase shift with excitonic spectral phase to guarantee quadrature in homodyne detection of ultrasound-induced surface displacements. The ability to tune through multiple quadratures is demonstrated here for the first time to our knowledge. We derive a noise-equivalent surface displacement of 1.7 ϫ 10 Ϫ6 Å (W/Hz) 1/2 at a field of 12 kV/cm and a fringe spacing of ⌳ ϭ 40 m. This value is within a factor of 7 of the shot-noise limit of an ideal interferometer.

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“…[1][2][3][4][5][6] Pulse shapers use spatial control of a spectrally dispersed light signal and all optical gates use ultrafast diffraction because of optically induced gratings. In these applications, not only an ultrafast response time but also a broad diffraction bandwidth is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Response of Diffraction Efficiency of GaAs/AlGaAs Photorefractive Multiple Quantum Well

Tanaka¹,

Terawaki²,

Kou³

et al. 2003

Jpn. J. Appl. Phys.

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Ultrafast response of the diffraction efficiency of a photorefractive multiple quantum well (PRMQW) has been investigated by pump-probe spectroscopy. We evaluated the temporal evolution of the diffraction efficiency of the PRMQW using a differential transmission spectrum. The results were compared with the output-widening factor of diffracted pulses. A good agreement obtained between our evaluation results and the results of electric-field cross correlation has confirmed the applicability of our technique in characterizing the diffraction efficiency of the PRMQW.

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Broadband low-dispersion diffraction of femtosecond pulses from photorefractive quantum wells

Cited by 11 publications

References 24 publications

Photorefractivity in Nematic Liquid Crystals Using a Donor−Acceptor Dyad with a Low-Lying Excited Singlet State for Charge Generation

Photorefractivity in Nematic Liquid Crystals Using a Donor−Acceptor Dyad with a Low-Lying Excited Singlet State for Charge Generation

Adaptive beam combining and interferometry with photorefractive quantum wells

Femtosecond Response of Diffraction Efficiency of GaAs/AlGaAs Photorefractive Multiple Quantum Well

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