2 papers
physics.optics2011
Optical nonlinearity in Ar and N near the ionization threshold
J. K. Wahlstrand, Y. -H. Cheng, Y. -H. Chen +1
We directly measure the nonlinear optical response in argon and nitrogen in a thin gas target to laser intensities near the ionization threshold. No instantaneous negative nonlinea…
physics.plasm-ph2010
Direct measurement of the electron density of extended femtosecond laser pulse-induced filaments
Y. -H. Chen, S. Varma, T. M. Antonsen +1
We present direct time- and space- resolved measurements of the electron density of femtosecond laser pulse-induced plasma filaments. The dominant nonlinearity responsible for exte…