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Photonics - peak temperature / thermal diffusivity

  1. Mar 30, 2008 #1
    1. The problem statement, all variables and given/known data

    Estimate the peak temperature for a 1 ns versus a 1 ms optical pulse with a total energy of 1 J in a 1 cm^2 spot is incident on a sheet of metal. The metal is 20 thou ( 20 thou = 0.5 m). The metal sheet is mounted on a copper block which is held at room temperature. The thermal diffusivity is, D = 0.1 cm^2/s. The absorbtion coefficient at the relevant wavelength (0.37 [tex]\mu[/tex]m) is [tex]\alpha[/tex] = 8000 cm[tex]^{-1}[/tex]


    2. Relevant equations

    x bar = (Dt)^1/2
    I(x) = Ie^([tex]^{-\alpha}[/tex]X)
    dI/dx = -[tex]\alpha[/tex]I


    3. The attempt at a solution

    this is for my general engineering phsycis class, the prof gave us a 4th year photonics assignment, i have no idea how to even approach it..
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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