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Systematic study of highly efficient white light generation in transparent materials using intense femtosecond laser pulses

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Abstract

We report the results of a systematic study of white light generation in different high band-gap optical media (BaF2, acrylic, water and BK-7 glass) using ultrashort (45 fs) laser pulses. We have investigated the influence of different parameters, such as focal position of the incident laser light within the medium, the polarization state of the incident laser radiation and the pulse duration of the incident laser beam on the white light generation. Our results indicate that for intense, ultrashort pulses, the position of physical focus inside the media is crucial in the generation, with high efficiency, of white light spectra over the wavelength range 400–1100 nm. Linearly polarized incident laser light generates white light with higher intensity in the blue region than circularly polarized light. Ultrashort (45 fs) pulses generate a flatter spectrum with higher white light conversion efficiency than longer (300 fs) pulses of the same laser power. We believe that a flat response over a wide range of wavelengths in the continuum may be efficiently compressed for generation of sub-10 fs pulses.

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Authors and Affiliations

  1. Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai, 400005, India

    A.K. Dharmadhikari, F.A. Rajgara & D. Mathur

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  1. A.K. Dharmadhikari
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  2. F.A. Rajgara
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  3. D. Mathur
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Correspondence to D. Mathur.

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PACS

52.38.Hb; 42.65.Jx; 42.65.Tg; 33.80.Wz; 52.35.Mw

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Dharmadhikari, A., Rajgara, F. & Mathur, D. Systematic study of highly efficient white light generation in transparent materials using intense femtosecond laser pulses. Appl. Phys. B 80, 61–66 (2005). https://doi.org/10.1007/s00340-004-1682-4

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  • DOI: https://doi.org/10.1007/s00340-004-1682-4

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