Genetic algorithm pulse shaping for optimum femtosecond propagation in optical fibers

Omenetto, Fiorenzo G.; Luce, Benjamin P.; Taylor, Antoinette J.

doi:10.1364/josab.16.002005

Cited by 33 publications

(11 citation statements)

References 7 publications

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“…These adaptive algorithms have been employed in a verity of scientific and engineering problems forming computational models of "natural selection" and evolutionary systems. [20][21][22][23][24] GAs are also used to optimize various electromagnetic properties of optical devices and systems [25][26][27][28][29][30][31][32] and specifically scattering problems. [33][34][35][36][37][38] Here, we briefly outline the algorithm that we use in our simulations.…”

Section: A)mentioning

confidence: 99%

Superscattering of light optimized by a genetic algorithm

Mirzaei

Miroshnichenko

Shadrivov

et al. 2014

Applied Physics Letters

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We analyse scattering of light from multi-layer plasmonic nanowires and employ a genetic algorithm for optimizing the scattering cross section. We apply the mode-expansion method using experimental data for material parameters to demonstrate that our genetic algorithm allows designing realistic core-shell nanostructures with the superscattering effect achieved at any desired wavelength. This approach can be employed for optimizing both superscattering and cloaking at different wavelengths in the visible spectral range.

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Section: A)mentioning

confidence: 99%

Superscattering of light optimized by a genetic algorithm

Mirzaei

Miroshnichenko

Shadrivov

et al. 2014

Applied Physics Letters

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“…These coherent techniques will enable unprecedented investigations of poorly understood acoustic phonon reflection and transmission at interfaces, with substrates, or in other materials to which the MQW is bonded. More generally, complex temporal pump pulse waveforms, created by genetic learning algorithms [25] and spatial light modulators [26], can be used as a coherent terahertz ultrasonic transducer to create nontrivial phonon excitations to explore or control phonon mediated decay or dephasing of carriers and excitons.…”

mentioning

confidence: 99%

Control of Coherent Acoustic Phonons in Semiconductor Quantum Wells

2001

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Using subpicosecond optical pump-probe techniques, coherent zone-folded longitudinal acoustic phonons (ZFLAPs) were investigated in an InGaN multiple quantum well structure. A two-pump differential transmission technique was used to generate and control coherent ZFLAP oscillations through the relative timing and amplitude of the two pump pulses. Enhancement and suppression of ZFLAP oscillations were demonstrated, including complete cancellation of generated acoustic phonons for the first time in any material system. Coherent control was used to demonstrate that ZFLAPs are generated differently in InGaN multiple quantum wells than in GaAs/AlAs superlattices.

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“…Still, a broadening in the temporal profile of the pulse occurs upon propagation due to group velocity dispersion (GVD), which arises by the natural frequency dependence of the refractive index of the medium, and in some cases self-phase modulation (SPM), which is produced by a nonlinear change in the refractive index in high intensity applications. To mitigate such temporal alterations, dispersion compensation methods can be used [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Delivery of ultrashort spatially focused pulses through a multimode fiber for two photon endoscopic imaging

Morales-Delgado

Papadopoulos

Farahi

et al. 2015

Biophotonics South America

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Due to their high number of supported modes, multimode optical fibers carry large amount of spatio-temporal information. However, propagation of a light pulse through a multimode optical fiber suffers from spatial distortions due to superposition of the various exited modes and from time broadening due to modal dispersion. Here, we present a method based on digital phase conjugation to selectively excite specific optical fiber modes in a multimode fiber that follow similar optical paths as they travel through the fiber. In this way, they can be made to interfere constructively at the fiber output to generate an ultrashort spatially focused pulse. The excitation of a limited number of modes limits modal dispersion, allowing the transmission of an ultrashort pulse. We also show that the short spatially focused pulse can be scanned digitally without movable elements. We experimentally demonstrate that the pulse at the output of the multimode fiber generate a two-photon signal. We show delivery of a 1550 nm pulse with 500 fs duration, spatially focused to a spot size of 7 micrometers, through a 30 cm long, 200 micrometers core multimode step-index fiber. We show how this technique is applied to endoscopic two-photon imaging.

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Genetic algorithm pulse shaping for optimum femtosecond propagation in optical fibers

Cited by 33 publications

References 7 publications

Superscattering of light optimized by a genetic algorithm

Superscattering of light optimized by a genetic algorithm

Control of Coherent Acoustic Phonons in Semiconductor Quantum Wells

Delivery of ultrashort spatially focused pulses through a multimode fiber for two photon endoscopic imaging

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