Focusing of ultrashort sub-TW laser pulses in air: supercontinuum emission

Prem Kiran P.; S. Bagchi; C. L. Arnold; S. Rama Krishnan; G. Ravindra Kumar; A. Couairon

doi:10.1117/12.898485

23 August 2011 Focusing of ultrashort sub-TW laser pulses in air: supercontinuum emission

Prem Kiran P., S. Bagchi, C. L. Arnold, S. Rama Krishnan, G. Ravindra Kumar, A. Couairon

Proceedings Volume 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics; 81730Q (2011) https://doi.org/10.1117/12.898485
Event: International Conference on Fiber Optics and Photonics, 2010, Guwahati, India

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.

Citation Download Citation

Prem Kiran P., S. Bagchi, C. L. Arnold, S. Rama Krishnan, G. Ravindra Kumar, and A. Couairon "Focusing of ultrashort sub-TW laser pulses in air: supercontinuum emission", Proc. SPIE 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics, 81730Q (23 August 2011); https://doi.org/10.1117/12.898485

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