Spectral modulation of ultraviolet femtosecond laser pulse by molecular alignment of CO2, O2, and N2

Yongdong Wang; Xiaomin Dai; Jian Wu; Liang'en Ding; Heping Zeng
January 2010
Applied Physics Letters;1/18/2010, Vol. 96 Issue 3, p031105
Academic Journal
We demonstrate efficient third harmonic generation of a near infrared femtosecond pulse through cascaded frequency doubling and sum-frequency generation processes, where the group velocity mismatching between the involved fundamental and generated second harmonic pulses, before they are sent to frequency mixing, are precompensated with a properly inserted nonlinear crystal. The spectrum of the generated third harmonic pulse with energy of 1.1 mJ is further modulated by using impulsive molecular alignments of CO2, O2, and N2, where significantly broadened spectrum in the ultraviolet spectral region is observed due to the additional cross-focusing effect from the parallel aligned molecules and the consequently enhanced self-phase modulation.


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