Dynamics of tightly focused femtosecond laser pulses in water
Dynamics of tightly focused femtosecond laser pulses in water
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Date
2013-10-01
Authors
Sreeja, S.
Leela, Ch
Kumar, V. Rakesh
Bagchi, Suman
Prashant, T. Shuvan
Radhakrishnan, P.
Tewari, Surya P.
Rao, S. Venugopal
Kiran, P. Prem
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Abstract
The dynamics of tightly focused ultrashort (40 fs) pulses manifested in terms of supercontinuum emission (SCE) and cavitation-induced bubbles (CIB) resulting from propagation in water over a wide range of input powers (6 mW-1.8 W) are presented. The effect of linear polarization (LP) and circular polarization (CP) on SCE in different external focal geometries (f/6, f/7.5 and f/10) is investigated and the results are discussed. SCE with higher efficiency and a considerable spectral blue shift is observed under tight focusing conditions (f/6) compared to loose focusing conditions (f/10). At higher input powers, CIB along the axis of propagation are observed to be assisting deeper propagation of these short pulses and enhanced SCE. © 2013 Astro Ltd.
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Laser Physics. v.23(10)