The contrast of femtosecond laser speckles in the image plane

Wenjun Liu; Changhe Zhou

doi:10.1117/12.576186

11 January 2005 The contrast of femtosecond laser speckles in the image plane

Wenjun Liu, Changhe Zhou

Proceedings Volume 5642, Information Optics and Photonics Technology; (2005) https://doi.org/10.1117/12.576186
Event: Photonics Asia, 2004, Beijing, China

Abstract

We put forward the concept of femtosecond laser speckles and studied twelve speckle patterns produced by four aluminium sheets with different surface roughness under illumination of three laser sources of one continuous wave laser and two other femtosecond pulsed lasers with FWHM widths of 36fs and 12fs, respectively. The femtosecond laser speckles are different from the conventional speckles in that femtosecond pulsed laser contain ultra-wide spectral contents. We explain the reason that makes femtosecond laser speckles different from conventional speckles. The relationship between speckle contrast and bandwidth of femtosecond laser is established, which well explains the experimental speckle contrast of the twelve speckle patterns.

Citation Download Citation

Wenjun Liu and Changhe Zhou "The contrast of femtosecond laser speckles in the image plane", Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); https://doi.org/10.1117/12.576186

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