Measurements of fluence profiles in femtosecond laser filaments in air

Xiao Long Liu, Weibo Cheng, Massimo Petrarca, Pavel Polynkin

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We introduce a technique to measure fluence distributions in femtosecond laser beams with peak intensity of up to several hundred terawatts per square centimeter. Our approach is based on the dependence of single-shot laser ablation threshold for gold on the angle of incidence of the laser beam on the gold sample. We apply this technique to the profiling of fluence distributions in femtosecond laser filaments at a wavelength of 800 nm in air. The peak intensity is found to be clamped at a level that depends on the external beam focusing. The limiting value of the peak intensity attainable in long-range 800 nm air filaments, under very loose focusing conditions (f-number above ∼500), is about 55 TW/cm2.

Original languageEnglish (US)
Pages (from-to)4751-4754
Number of pages4
JournalOptics letters
Volume41
Issue number20
DOIs
StatePublished - Oct 15 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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