G. C. Modoran and D. Schumacher, "Direct Measurement of Intense Field Ionization Rates in Sapphire and Water During Short Pulse Laser Propagation,"
in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies,
OSA Technical Digest (CD)
(Optical Society of America, 2007), paper QThD3.
We describe a pump-probe experiment that directly measures electron ionization rates via plasma-induced blue-shifting during filamentation of a short laser pulse. We compare to Keldysh and Thornber theory.