Ultrafast slow-light: Raman-induced delay of THz-bandwidth pulses

We propose and experimentally demonstrate a scheme to generate optically-controlled delays based on off-resonant Raman absorption. Dispersion in a transparency window between two neighboring, optically-activated Raman absorption lines is used to reduce the group velocity of broadband 765 nm pulses....

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Bibliographic Details
Published in:arXiv.org 2015-08
Main Authors: Bustard, Philip J, Heshami, Khabat, England, Duncan G, Spanner, Michael, Sussman, Benjamin J
Format: Article
Language:English
Subjects:
Absorption
Bandwidths
Broadband
Delay
Group velocity
Photons
Potassium titanyl orthophosphate
Signal processing
Online Access:Get full text
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Summary:We propose and experimentally demonstrate a scheme to generate optically-controlled delays based on off-resonant Raman absorption. Dispersion in a transparency window between two neighboring, optically-activated Raman absorption lines is used to reduce the group velocity of broadband 765 nm pulses. We implement this approach in a potassium titanyl phosphate (KTP) waveguide at room temperature, and demonstrate Raman-induced delays of up to 140 fs for a 650-fs duration, 1.8-THz bandwidth, signal pulse; the available delay-bandwidth product is \(\approx1\). Our approach is applicable to single photon signals, offers wavelength tunability, and is a step toward processing ultrafast photons.
ISSN:2331-8422
DOI:10.48550/arxiv.1508.01729