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Proceedings Paper

Focusing of ultrashort sub-TW laser pulses in air: supercontinuum emission
Author(s): Prem Kiran P.; S. Bagchi; C. L. Arnold; S. Rama Krishnan; G. Ravindra Kumar; A. Couairon
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Paper Abstract

Our recent work [Phys. Rev. A, 82, 013805 (2010)] clearly establishes a new regime of filamentation beyond the conventional "intensity clamping" by high-resolution spatial imaging of filaments. We present the corresponding measurements of the supercontinuum emission (SCE) from filaments in this regime produced by ultrashort (45 fs) sub- TW (up to 0.2 TW) Ti:Sapphire laser pulses focused air under tight (f/6) focusing geometry. The intimate connection between the spatial and spectral domains in the new regime is established by investigating the spectral broadening of SCE at peak intensities exceeding 1014 W/cm2 pulses at the focus thus giving a more complete picture of this new regime in filamentary propagation of intense fs pulses.

Paper Details

Date Published: 23 August 2011
PDF: 6 pages
Proc. SPIE 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics, 81730Q (23 August 2011); doi: 10.1117/12.898485
Show Author Affiliations
Prem Kiran P., Univ. of Hyderabad (India)
Tata Institute of Fundamental Research (India)
S. Bagchi, Univ. of Hyderabad (India)
Tata Institute of Fundamental Research (India)
C. L. Arnold, Lab. d'Optique Appliquée, CNRS, Ecole Nationale Supérieure de Techniques Avancées (France)
S. Rama Krishnan, Sri Sathya Sai Univ. (India)
G. Ravindra Kumar, Tata Institute of Fundamental Research (India)
A. Couairon, Ctr. de Physique Theorique, CNRS, Ecole Polytechnique (France)


Published in SPIE Proceedings Vol. 8173:
Photonics 2010: Tenth International Conference on Fiber Optics and Photonics
Sunil K. Khijwania; Banshi D. Gupta; Bishnu P. Pal; Anurag Sharma, Editor(s)

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