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Determination of Cross-Sectional Area of Focused Picosecond Gaussian Laser BeamMeasurement of the waist diameter of a focused Gaussian-beam at the 1/e(sup 2) intensity, also referred to as spot size, is key to determining the fluence in laser processing experiments. Spot size measurements are also helpful to calculate the threshold energy and threshold fluence of a given material. This work reports an application of a conventional method, by analyzing single laser ablated spots for different laser pulse energies, to determine the cross-sectional area of a focused Gaussian-beam, which has a nominal pulse width of approx. 10 ps. Polished tungsten was used as the target material, due to its low surface roughness and low ablation threshold, to measure the beam waist diameter. From the ablative spot measurements, the ablation threshold fluence of the tungsten substrate was also calculated.
Document ID
20180001865
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Ledesma, Rodolfo (Virginia Univ. Charlottesville, VA, United States)
Fitz-Gerald, James (Virginia Univ. Charlottesville, VA, United States)
Palmieri, Frank (NASA Langley Research Center Hampton, VA, United States)
Connell, John (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
March 12, 2018
Publication Date
February 1, 2018
Subject Category
Optics
Report/Patent Number
NF1676L-29237
NASA/TM-2018-219809
L-20906
Funding Number(s)
WBS: WBS 826611.04.07.03
Distribution Limits
Public
Copyright
Public Use Permitted.

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