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Temporal autolocalization of femtosecond light pulses in the filaments observed in fused silica

Blonskyi I. V., Kadan V. M., Puzikov V. M. and Grin' L. A.

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Abstract. We observe temporal self-compression of the axial component of femtosecond laser pulse in the filamentation regime in fused silica and find optimized conditions for the maximum compression. Using spatial filtration, we extract the axial component of the pulse compressed down to the duration of 63 fs from the initial 160 fs one. The compressed pulse can be used as a probe in pump-probe measurements to improve their temporal resolution.

Keywords: femtosecond laser, filamentation, self-compression, fused silica

PACS: 42.65.Re 42.65.Jx 52.38.Dx
UDC: 535.561+535.37+535.18 
Ukr. J. Phys. Opt. 14 85-90
doi: 10.3116/16091833/14/2/85/2013
Received: 25.02.2013

Анотація. Спостережено часову самокомпресію аксіальної компоненти фемтосекундного лазерного імпульсу в режимі філаментації в плавленому кварці і знайдено оптимізовані умови максимальної компресії. З використанням просторової фільтрації відокремлено аксіальну компоненту імпульсу та скорочено її до 63 фс від початкової тривалості 160 фс. Скорочений імпульс можна використовувати як зондуючий для покращення часової розді-льної здатності у вимірах за схемою "збудження–зондування". 
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