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We report on experimental results in adaptive control over UV fluorescence from a femtosecond filament created in nitrogen. We demonstrate that an optimized sequence of femtosecond pulses can effectively align, selectively ionize and excite molecular nitrogen ions, resulting in stimulated amplification of a filament continuum seeded emission at 391 nm, 358 nm and 428 nm wavelengths.
We investigate attosecond electron tunnelling dynamics in a time-resolved pump-probe experiment on the generation of higher-order harmonics that are emitted due to a stepwise plasma concentration change occurring with each half-cycle of the pump-field.
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