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3D nanosecond pulsed laser simulation on comsol v4

Posted Apr 2, 2011, 11:08 a.m. EDT Heat Transfer & Phase Change Version 4.0 5 Replies

Mohamed Youssef
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please i want to add 3D nanosecond laser to COMSOL v4, and i want to have its irradiation curve like a gaussian pulse.

Thanks
Mohamed Youssef
5 Replies Last Post Jul 13, 2011, 1:54 p.m. EDT
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Hello Mohamed Youssef

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Dhruv Kedar
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Posted: 1 decade ago Jun 30, 2011, 5:00 p.m. EDT
The density of the energy distribution can be modeled by a Gaussian, if that is what you need.
You can use Q = const*z*exp(-(z+z0-c*t)^2/sigz^2)*exp(-r^2/sigr^2)
Where the constant = 2*c*(energy deposited by single bunch)/(pi*sqrt(pi0*sigz*sigr^2*target thickness)
For energy distributed through entire depth of target
The density of the energy distribution can be modeled by a Gaussian, if that is what you need. You can use Q = const*z*exp(-(z+z0-c*t)^2/sigz^2)*exp(-r^2/sigr^2) Where the constant = 2*c*(energy deposited by single bunch)/(pi*sqrt(pi0*sigz*sigr^2*target thickness) For energy distributed through entire depth of target
Mert Tuzer
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Posted: 1 decade ago Jul 12, 2011, 4:17 a.m. EDT
Pulse duration: 10 ns
Intensity: 10 W/cm^2

For the given parameters and 2-D cylindrical geometry, how can I write a heat source equation?

P.s: For now, I have just used (I0*a), where I0 is intensity and a is the absorption coefficient of the related domain. I am looking for temporal and spatial parts of this source term: I0*a*(temporal term)*(spatial term).

Thanks
Pulse duration: 10 ns Intensity: 10 W/cm^2 For the given parameters and 2-D cylindrical geometry, how can I write a heat source equation? P.s: For now, I have just used (I0*a), where I0 is intensity and a is the absorption coefficient of the related domain. I am looking for temporal and spatial parts of this source term: I0*a*(temporal term)*(spatial term). Thanks
Dhruv Kedar
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Posted: 1 decade ago Jul 13, 2011, 11:27 a.m. EDT
What are your geometry parameters?
What are your geometry parameters?
Mert Tuzer
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Posted: 1 decade ago Jul 13, 2011, 12:56 p.m. EDT
I have used a rectangle with a small plane at the left in it?
I have used a rectangle with a small plane at the left in it?
Dhruv Kedar
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Posted: 1 decade ago Jul 13, 2011, 1:54 p.m. EDT
The Gaussian I gave you will have units of W/m^3 so that is not applicable in this case.What exactly do you want the pulse to do?
The Gaussian I gave you will have units of W/m^3 so that is not applicable in this case.What exactly do you want the pulse to do?

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