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UV laser interaction with a fluorescent dye solution studied using pulsed digital holography.

Eynas Amer, Per Gren, Mikael Sjödahl

    Optics Express
    |October 24, 2013
    PubMed
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    This study uses pulsed digital holography to measure stimulated laser induced fluorescence (LIF) in Coumarin 153 dye. The technique quantifies energy transfer and shows potential for studying fluorescent species.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Photochemistry

    Background:

    • Laser-induced fluorescence (LIF) is crucial for analyzing fluorescent materials.
    • Quantitative measurements of LIF gain and energy transfer are essential for material characterization.

    Purpose of the Study:

    • To investigate the application of pulsed digital holography for quantitative analysis of stimulated LIF.
    • To measure the energy transfer dynamics in Coumarin 153 dye solution pumped by a Q-switched Nd-YAG laser.

    Main Methods:

    • Utilized a frequency-tripled Q-switched Nd-YAG laser (355 nm) to pump Coumarin 153 in ethanol.
    • Employed a frequency-doubled pulse (532 nm) as a probe beam to measure LIF gain via digital holography.
    • Analyzed intensity and phase maps from holograms to determine probe beam gain and local temperature rise.

    Main Results:

    • Quantified the gain of the probe beam resulting from stimulated LIF.
    • Determined that approximately 15% of the pump beam energy is converted to heat in the dye solution.
    • Calculated local temperature increases using Radon inversion on phase map data.

    Conclusions:

    • Pulsed digital holography is a viable and promising technique for quantitative studies of fluorescent species.
    • The study provides insights into the energy conversion processes in laser-pumped dye solutions.
    • Demonstrated the capability of digital holography to simultaneously measure optical gain and thermal effects.