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Related Experiment Video

Updated: Jun 20, 2026

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
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Published on: April 25, 2019

Self-focusing in CS(2) at 10.6 microm.

M Mohebi, P F Aiello, G Reali

    Optics Letters
    |September 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We measured the nonlinear refractive index of carbon disulfide (CS2) at 10.6 micrometers. The nonlinear refractive index (n(2)) was found to be significantly larger than values observed in the visible spectrum.

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    Area of Science:

    • Nonlinear optics
    • Condensed matter physics
    • Materials science

    Background:

    • The nonlinear refractive index (n(2)) is a crucial parameter for understanding light-matter interactions.
    • Previous measurements of n(2) for carbon disulfide (CS2) have primarily focused on visible wavelengths.
    • Investigating n(2) at longer wavelengths, such as 10.6 micrometers, is essential for applications in infrared optics.

    Purpose of the Study:

    • To accurately measure the nonlinear refractive index (n(2)) of carbon disulfide (CS2) at a 10.6 micrometer wavelength.
    • To compare the measured n(2) value with existing data in the visible spectrum.
    • To assess the potential of CS2 for nonlinear optical applications in the infrared region.

    Main Methods:

    • Utilized whole-beam self-focusing to observe the nonlinear optical response.
    • Employed a precise experimental setup to measure the onset of self-focusing at 10.6 micrometers.
    • Calculated the nonlinear refractive index (n(2)) based on the self-focusing threshold.

    Main Results:

    • The nonlinear refractive index (n(2)) of CS2 was determined to be (2.2 ± 0.7) x 10⁻¹⁰ esu.
    • This measured value is over an order of magnitude greater than the n(2) values typically reported for CS2 in the visible spectrum.
    • The results indicate a significant enhancement of nonlinear optical properties at 10.6 micrometers.

    Conclusions:

    • Carbon disulfide exhibits a substantially enhanced nonlinear refractive index at 10.6 micrometers compared to visible wavelengths.
    • The findings highlight CS2 as a promising material for nonlinear optical devices operating in the infrared.
    • Further research into wavelength-dependent nonlinear optical properties of materials is warranted.