On the role of chemical reactions in initiating ultraviolet laser ablation in poly(methyl methacrylate)

2007 ◽  
Vol 101 (10) ◽  
pp. 103113 ◽  
Author(s):  
Manish Prasad ◽  
Patrick F. Conforti ◽  
Barbara J. Garrison
Keyword(s):  
Laser Ablation ◽  
Methyl Methacrylate ◽  
Chemical Reactions ◽  
Ultraviolet Laser ◽  
Poly Methyl Methacrylate

Ablation of Polymers with Pairs of Ultraviolet Laser Pulses with Controlled Temporal Separation

1988 ◽  
Vol 129 ◽  
Author(s):  
Bodil Braren ◽  
R. Srinivasan
Keyword(s):  
Laser Ablation ◽  
Methyl Methacrylate ◽  
Pulse Width ◽  
Electronic States ◽  
Laser Pulses ◽  
Etch Depth ◽  
Time Interval ◽  
Temporal Separation ◽  
Ultraviolet Laser ◽  
Poly Methyl Methacrylate

ABSTRACTThe dependance on the pulse width of the ultraviolet laser ablation and etching of poly(methyl methacrylate) was examined using 40-100 ns pulses. These pulses were created by stitching together two identical pulses, each of 40 ns half-width, which were separated by a set time interval from 0 to 380 ns. The etch depth/pulse is sensitive to the pulse width and, therefore, the power density in this polymer.The response of PMMA to etching by pairs of pulses suggests that short-lived species which may be electronic states (e.g., triplets) and/or radicals play an important role in the ablation. The shape of the pulse was also found to influence the etch depth/pulse.The etching of polyimide by these extended pulses shows trends that are opposite to those observed in poly(methyl methacrylate). In this instance the shielding of the latter portion of the incoming pulse by the products that are ablated by the front portion is probably a serious effect.

Simulations of Laser Ablation of Poly(methyl methacrylate):  Fluence versus Number of Photons

2007 ◽  
Vol 111 (32) ◽  
pp. 12024-12030 ◽  
Author(s):  
Patrick F. Conforti ◽  
Manish Prasad ◽  
Barbara J. Garrison
Keyword(s):  
Laser Ablation ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate
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