Multiphoton momentum trasfer

  • Thread starter 1Keenan
  • Start date
  • #1
100
3
Hi everybody,

I'm reading P. Gibbon book "Short Pulse Laser Interaction with Matters", and I'm having a problem.
Describing the ejection of an electron from a focused laser beam the book says, on pag 39, that "the kinetic energy of the electron is given by:

[itex]\Delta[/itex]U=([itex]\gamma[/itex]-1)mc[itex]^{2}[/itex]

This energy is extracted from electromagnetic field via multiphoton momentum transfer."

I would like to know the demostration of that formula, since no clue is given in the book.

Thanks for helping
 

Answers and Replies

  • #2
kith
Science Advisor
1,413
499
ɣmc² is the total energy of a relativistic massive particle. When you subtract the rest energy mc² from this, you get the relativistic kinetic energy.

This is just an energy conservation consideration and has nothing to do with the concrete mechanism of how this energy is extracted from the em field.
 
  • #3
100
3
I get confused because of the multiphoton stuff...

Thank you very much
 

Related Threads on Multiphoton momentum trasfer

  • Last Post
Replies
4
Views
9K
  • Last Post
Replies
6
Views
10K
Replies
4
Views
1K
  • Last Post
Replies
9
Views
2K
Replies
3
Views
1K
  • Last Post
Replies
3
Views
16K
  • Last Post
Replies
6
Views
13K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
6
Views
6K
Top