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Related Concept Videos

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)
07:04

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Published on: May 23, 2014

Superluminal-source-induced emission.

I Golub

    Optics Letters
    |October 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers demonstrate Raman emission using a novel superluminal source. This method offers efficient generation of ultrashort pulses for various advanced optical applications.

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    Published on: November 15, 2016

    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Ultrafast Lasers

    Background:

    • Superluminal sources offer unique light-matter interaction possibilities.
    • Conventional methods for generating ultrashort pulses face limitations like self-phase modulation and temporal walk-off.
    • Efficient generation of Raman emission is crucial for various spectroscopic and nonlinear optical applications.

    Purpose of the Study:

    • To demonstrate Raman emission from an axicon-generated superluminal source.
    • To investigate the characteristics of anti-Stokes radiation emission.
    • To highlight the advantages of this superluminal source generation technique for ultrafast pulse applications.

    Main Methods:

    • Utilizing an axicon to generate a superluminal light source.
    • Analyzing the angular emission of anti-Stokes radiation.
    • Evaluating the performance in terms of self-phase modulation and group-velocity dispersion compensation.

    Main Results:

    • Successful demonstration of Raman emission from the superluminal source.
    • Observation of anti-Stokes radiation emitted at an angle governed by a Cerenkov-type condition.
    • Confirmation of reduced pump self-phase modulation and compensation of temporal walk-off.

    Conclusions:

    • Axicon-generated superluminal sources provide an effective platform for efficient Raman conversion.
    • The technique is advantageous for pump-probe measurements and harmonic/optical parametric generation.
    • This method enhances the utility of ultrashort intense pulses in nonlinear optics.