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Precision Beam Splitters for CO(2) Lasers.

D L Franzen

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study evaluates beam splitters for high-power 10-micrometer lasers, crucial for precise power measurements. ZnSe demonstrated superior stability and accuracy, achieving a 0.4% standard deviation in beam splitter ratio measurements.

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    Absolute reference calorimeter for measuring high power laser pulses.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Materials Science

    Background:

    • Accurate measurement of high average laser power is essential for various scientific and industrial applications.
    • Beam splitters are critical optical components for power measurement, but their stability at high power densities is a concern.
    • Existing beam splitters may not perform reliably with high-power 10-micrometer lasers.

    Purpose of the Study:

    • To investigate the stability and performance of various beam splitter materials for 10-micrometer lasers.
    • To assess the suitability of these beam splitters for precision measurement of high average laser powers (20-600 W).
    • To determine the accuracy of beam splitter ratios compared to theoretical predictions.

    Main Methods:

    • Tested beam splitter stability using materials like GaAs, CdTe, ZnSe, and KCl.

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  • Operated within a power range of 20-600 W, with power densities up to 1 kW/cm².
  • Measured absolute beam splitter ratios and their precisions using statistical analysis (standard deviation).

    • Main Results:

    • Typical standard deviations for beam splitter ratios were around 1% across the tested power range.
    • Absolute beam splitter ratios closely matched predictions from Fresnel's equations (within 1% or better).
    • ZnSe exhibited the best performance, with a standard deviation of 0.4% and agreement with Fresnel's equations better than 0.5%.

    Conclusions:

    • Semiconductor (ZnSe, GaAs, CdTe) and alkali-halide (KCl) beam splitters can be used for high-power 10-micrometer laser measurements.
    • ZnSe offers excellent stability and accuracy for high average power measurements, outperforming other tested materials.
    • The experimental results validate the use of Fresnel's equations for predicting beam splitter performance in this wavelength and power regime.