Third and fifth harmonics generation by tightly focused femtosecond pulses at 2.2 μm wavelength in air
arXiv:1106.5511 · doi:10.1364/OE.20.001662
Abstract
We report experiments on the generation of third and fifth harmonics of millijoule-level, tightly focused, femtosecond laser pulses at 2.2 μm wavelength in air. The measured ratio of yields of the third and fifth harmonics in our setup is about 2 \cdot 10-4. This result contradicts the recent suggestion that the Kerr effect in air saturates and changes sign in ultra-intense optical fields.
3 pages, 2 figures
References in corpus (11)
- Ultrashort filaments of light in weakly-ionized, optically-transparent media
- Higher-order Kerr terms allow ionization-free filamentation in gases
- Direct measurement of the electron density of extended femtosecond laser pulse-induced filaments
- Transition from plasma- to Kerr-driven laser filamentation
- Optical nonlinearity in Ar and N near the ionization threshold
- Experimental Tests of the New Paradigm for Laser Filamentation in Gases
- Generalized Miller Formulae
- Effect of a plasma grating on pump-probe experiments near the ionization threshold in gases
- Microscopic model for the higher-order nonlinearity in optical filaments
- Spectral dependence of purely-Kerr driven filamentation in air and argon
- From higher-order Kerr nonlinearities to quantitative modeling of 3rd and 5th harmonic generation in argon