Abstract
We revealed that interaction of femtosecond laser induced filament with the metal target placed in air is accompanied by x-ray bursts. The average energy of x-ray photons is increased by up to 4 times as compared to the transform-limited pulses (60 fs) when the positively chirped laser pulses (500 fs) are produced by the monofilament. Increase of x-ray response is also accompanied by the enhancement of the average ablation rate. The temperature of the hot electrons from filament induced plasma obtained from x-ray spectra made it possible to estimate the peak intensity inside the femtosecond laser filament, which turned out to be about 200 TW cm−2.
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