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Photonics - peak temperature / thermal diffusivity

  • Thread starter nadeemo88
  • Start date
6
0
1. Homework Statement

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. Homework 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. Homework Statement



2. Homework Equations



3. The Attempt at a Solution
 

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