Coherence length measurement for femtosecond lasers using digital holography and statistical fringe analysis

Authors

  • Esmerando Escoto ⋅ PH National Institute of Physics, University of the Philippines Diliman
  • Percival Almoro ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

A technique to measure the temporal coherence length of a femtosecond laser using digital holography and statistical fringe analysis is demonstrated experimentally. A Michelson-type holographic setup at a condition of near zero-path length difference is constructed with a small tilt between the mirrors forming a parallel fringe digital hologram. Due to the short coherence of the femtosecond laser, the hologram fringes and reconstructed phase map appear only within a local area in the transverse plane. The coherence length is then obtained based on the average width of the phase map area determined using a statistical fringe analysis algorithm, fringe spacing and the central wavelength.

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Published

2012-10-22

How to Cite

[1]
E Escoto and P Almoro, Coherence length measurement for femtosecond lasers using digital holography and statistical fringe analysis, Proceedings of the Samahang Pisika ng Pilipinas 30, SPP2012-3A-5 (2012). URL: https://proceedings.spp-online.org/article/view/SPP2012-3A-5.