Peer-Reviewed Journal Details
Mandatory Fields
Mullan, C,O'Connor, GM,Favre, S,Ilie, D,Glynn, TJ
2007
August
Journal Of Laser Applications
Estimating spot size and relating hole diameters with fluence and number of shots for nanosecond and femtosecond laser ablation of polyethylene terephthalate
Published
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Optional Fields
laser ablation spot size hole diameter nanosecond femtosecond COMMON METALS POLYIMIDE PULSES POLYMERS AIR THRESHOLDS DAMAGE NM
19
158
164
The relationship between focused spot size, pulse energy, and ablated hole diameter was explored using 266 nm nanosecond pulses and 775 nm femtosecond pulses on polyethylene terephthalate. The spot size of a Gaussian laser beam can be deduced from the diameters of holes machined with single shots at different pulse energies but the results can be influenced by such issues as the thickness of the material and the range of fluence chosen. These limitations of the method were investigated. Multiple shot craters were also measured but gave an overestimation. of spot size, particularly in the femtosecond case. A model was developed to predict the diameter for a given energy and number of shots. Tests of the model gave results that agreed well with the predicted values. It was found that for the same total energy smaller holes can be obtained by decreasing the pulse energy and increasing the number of shots. An effective spot size for multiple shots was determined. (c) 2007 Laser Institute of America.
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