#### EL

Science Advisor

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- 0

I would also really appreciate some good links/references about Photon-Photon scattering in general, and the following subjects in particular:

*The Heisenberg-Euler Lagrangian, and the resulting nonlinear corrections to Maxwell's vacuum equations.

*Suggested Photon-Photon scattering detectors.

*High intensity lasers in general.

*Ultra-short intense lasers (chirped pulse amplification).

*Free electron laser (FEL).