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Nonlinear refraction in CS(2) at 10.6 microm.

I Golub, Y Beaudoin, S L Chin

    Optics Letters
    |September 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study measured the nonlinear refractive index of carbon disulfide (CS(2)) at 10.6 micrometers using external self-focusing. The results confirm previous values, resolving recent scientific controversy.

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    Area of Science:

    • Nonlinear optics
    • Condensed matter physics
    • Laser-matter interactions

    Background:

    • The nonlinear refractive index (n(2)) of carbon disulfide (CS(2)) at 10.6 micrometers is crucial for understanding nonlinear optical phenomena.
    • Recent studies have presented conflicting values for n(2) in CS(2) at this wavelength, necessitating accurate measurement.
    • Ultrafast optical effects in CS(2) are important for applications in optical switching and signal processing.

    Purpose of the Study:

    • To accurately measure the nonlinear refractive index (n(2)) of CS(2) at 10.6 micrometers.
    • To resolve the recent controversy regarding the value of n(2) for CS(2) at this wavelength.
    • To investigate the self-bending of a CO(2) laser beam in CS(2) and deduce n(2) from this effect.

    Main Methods:

    • External self-focusing technique was employed to measure n(2).
    • A spatially asymmetric CO(2) laser beam was used to induce self-bending in CS(2).
    • The ultrafast Kerr effect was analyzed to deduce n(2) from beam self-bending.

    Main Results:

    • The measured nonlinear refractive index n(2) of CS(2) at 10.6 micrometers is (2.1 +/- 0.7) x 10(-11) esu.
    • This value is consistent with previously accepted n(2) values for CS(2) in the visible spectrum.
    • Observed self-bending of the CO(2) laser beam in CS(2) provided n(2) values in agreement with the self-focusing measurements.

    Conclusions:

    • The controversy surrounding the nonlinear refractive index of CS(2) at 10.6 micrometers is resolved.
    • The measured n(2) value confirms its similarity to values in the visible range.
    • The ultrafast Kerr effect in CS(2) can be reliably used to determine its nonlinear refractive index.