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Proceedings Paper

Supercontinuum emission from water using fs pulses in the external tight focusing limit
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Paper Abstract

From the initial observation of self-channeling of high-peak power femtosecond (fs) laser pulses in air, propagation of intense ultrashort laser pulses in different media has become one of the most investigated research areas. The supercontinuum emission (SCE), a spectral manifestation of the spatio-temporal modifications experienced by a propagating ultrashort laser pulse in a nonlinear medium, has many practical applications. However, the extent of blue shift of SCE is reported to be constant due to the phenomenon of "intensity clamping". To further explore the recently observed regime of filamentation without intensity clamping, we measured the evolution of spectral blue shift of SCE resulting from the propagation of fs pulses (800 nm, 40 fs, 1 kHz) in distilled water under different focusing geometries. The efficiency of SCE from tight focusing (f/6) geometry was always higher than the loose focusing (f/12) geometry for both linear and circular polarized pulses. The blue edge of the SCE spectrum (λmin) was found to be blue shifted for f/6 focusing conditions compared to f/12 focusing geometry. The lower bound of the intensity deposited in the medium measured from the self-emission from the filament demonstrated the existence of intensities ~ 6x1013 Wcm-2, far beyond the clamping intensities achieved erstwhile.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8247, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XII, 824718 (30 January 2012); doi: 10.1117/12.907278
Show Author Affiliations
S. Sreeja, Univ. of Hyderabad (India)
S. Venugopal Rao, Univ. of Hyderabad (India)
P. Radhakrishnan, Cochin Univ. of Science and Technology (India)
Surya P. Tewari, Univ. of Hyderabad (India)
P. Prem Kiran, Univ. of Hyderabad (India)

Published in SPIE Proceedings Vol. 8247:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XII
Alexander Heisterkamp; Michel Meunier; Stefan Nolte, Editor(s)

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