Harmonic Generation in N2 and Ar by Wave-Mixing

Harmonic generation in gases has been investigated by mixing of fundamental (1064n-m) and second harmonic (532nm) of a 100-mJ 35-ps Nd:YAG laser. Even and odd harmonics of fundamental wavelength are generated by wave-mixing. We have investi­ gated in detail harmonic spectrum in Ar and up to the 14th harmonics, versus the gas pressure and laser intensity.