Measurements of the nonlinear refractive index of air, N2, and O2at 10 μm using four-wave mixing.
We report on measurements of the nonlinear index of refraction of air, N2, and O2at a wavelength close to 10 μm by collinear four-wave mixing of a 200 MW CO2laser beat-wave. The use of a 200 ps long beat-wave comprising radiation amplified on the 10P20 and 10R16 lines of the CO2laser provides a sensitive method to measure the small nonlinearities characteristic of the gas phase in a spectral region where no such data exists.
J J
JJ
Pigeon
S Ya
SY
Tochitsky
E C
EC
Welch
C
C
Joshi