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Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Light amplification by evanescent wave coupling in a multimode fiber.

H Injeyan, O M Stafsudd, N G Alexopoulos

    Applied Optics
    |April 15, 2010
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    This study demonstrates light amplification in multimode fibers using evanescent wave coupling. Researchers achieved significant gain coefficients by pumping a dye-infused fiber with a laser, showing potential for advanced optical amplification.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Laser Physics

    Background:

    • Light amplification is crucial for optical communication and sensing.
    • Evanescent wave coupling offers a method for energy transfer between optical modes.
    • Multimode fibers support multiple light propagation pathways.

    Purpose of the Study:

    • To report and analyze light amplification in multimode fibers via evanescent wave coupling.
    • To investigate the impact of dye immersion and laser pumping on light gain.
    • To theoretically model and validate experimental observations of amplified bound modes.

    Main Methods:

    • Immersing stripped multimode fiber sections in a Kiton red dye solution.
    • Pumping the dye solution using evanescent fields from a continuous-wave Argon-ion laser.
    • Measuring gain coefficients with a Helium-Neon probe beam.
    • Performing numerical calculations using Taylor series expansion of the waveguide eigenvalue equation.

    Main Results:

    • Achieved gain coefficients as high as 0.02/cm with a 633-nm probe beam.
    • Observed amplification of light propagating as bound modes within the fiber.
    • Numerical calculations predicted gains exceeding 60% for modes near cutoff.

    Conclusions:

    • Evanescent wave coupling in dye-infused multimode fibers enables significant light amplification.
    • The experimental and numerical results highlight the potential of this technique for optical gain.
    • Modes near cutoff in the fiber cladding show particularly high amplification potential.