bessel bessel

Definition(s):

  • (n) German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846)

News

  • Plano-Concave Axicons suit laser material processing.

    Featuring one concave conical surface and one plano surface, Plano-Concave Axicons are used in laser material processing to create ring-shaped image along optical axis and non-diffractive approximation of Bessel beam. Units are available in twelve 25.4 mm diameter models with apex angles of 90, 130, 140, 160, 170, or 175°, and either VIS 0° or NIR I coating. When Plano-Concave Axicons are used ...
    on June 17, 2013     Source: ThomasNet

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repudiate repudiate
/ri ˈpju di ˌeɪt /