dorsal/arxiv
View SchemaRecent Experimental and Theoretical Advances in Microdrilling of Polymers with Ultraviolet Laser Beams
| Authors | Sylvain Lazare, Vladimir Tokarev |
|---|---|
| Categories | |
| ArXiv ID | physics/0412137 |
| URL | https://arxiv.org/abs/physics/0412137 |
| DOI | 10.1117/12.596295 |
| Journal | S. Lazare, V. Tokarev, Invited in Fifth International Symposium on Laser Precision Microfabrication, edited by Isamu Miyamoto, Henry Helvajian, Kazuyoshi Itoh, Kojiro F. Kobayashi, Andreas Ostendorf, Koji Sugioka, Proceedings of SPIE Vol. 5662 (SPIE, Bell, Japon (2004) 221-231 |
Abstract
Laser drilling becomes of increasing importance when hole diameter is in the range of 10 to 50 mum, for which conventional alternative approaches are becoming difficult and cost inefficient. Furthermore, it is viewed as the technique of choice for a number of composite materials and hard materials which are not readily processed at the microscopic level by contact mechanical tools. We have demonstrated that suitable experimental conditions are capable of producing microholes with record aspect-ratio (up to 600) in pure polymers like PET, PI, PC, PS, PMMA, PEEK,... For example holes of diameter typically 30 mum can be as long as 18 mm, depth at which the drilling rate is getting nearly zero and the profile stationary. Other materials (metals, ceramics) which can be similarly laser microdrilled do not exhibit such very high aspect-ratio. The mechanisms of the drilling process have been studied in details and an original analytical model has been constructed recently. The various experimental results, obtained with the KrF laser, will be reviewed with emphasis on the parameters leading to formation of good holes with high aspect-ratio. For the application it is also important to note that such high values of aspect-ratio are obtained with regular configuration of the KrF laser giving a standard divergence of 3 mrad. However as shown by the model there is still room for improvement by using a beam with a lower divergence (theoretical limit is 0.2 mrad). Further experimental work is now in progress.
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"abstract": "Laser drilling becomes of increasing importance when hole diameter is in the\nrange of 10 to 50 mum, for which conventional alternative approaches are\nbecoming difficult and cost inefficient. Furthermore, it is viewed as the\ntechnique of choice for a number of composite materials and hard materials\nwhich are not readily processed at the microscopic level by contact mechanical\ntools. We have demonstrated that suitable experimental conditions are capable\nof producing microholes with record aspect-ratio (up to 600) in pure polymers\nlike PET, PI, PC, PS, PMMA, PEEK,... For example holes of diameter typically 30\nmum can be as long as 18 mm, depth at which the drilling rate is getting nearly\nzero and the profile stationary. Other materials (metals, ceramics) which can\nbe similarly laser microdrilled do not exhibit such very high aspect-ratio. The\nmechanisms of the drilling process have been studied in details and an original\nanalytical model has been constructed recently. The various experimental\nresults, obtained with the KrF laser, will be reviewed with emphasis on the\nparameters leading to formation of good holes with high aspect-ratio. For the\napplication it is also important to note that such high values of aspect-ratio\nare obtained with regular configuration of the KrF laser giving a standard\ndivergence of 3 mrad. However as shown by the model there is still room for\nimprovement by using a beam with a lower divergence (theoretical limit is 0.2\nmrad). Further experimental work is now in progress.",
"arxiv_id": "physics/0412137",
"authors": [
"Sylvain Lazare",
"Vladimir Tokarev"
],
"categories": [
"physics.chem-ph"
],
"doi": "10.1117/12.596295",
"journal_ref": "S. Lazare, V. Tokarev, Invited in Fifth International Symposium on\n Laser Precision Microfabrication, edited by Isamu Miyamoto, Henry Helvajian,\n Kazuyoshi Itoh, Kojiro F. Kobayashi, Andreas Ostendorf, Koji Sugioka,\n Proceedings of SPIE Vol. 5662 (SPIE, Bell, Japon (2004) 221-231",
"title": "Recent Experimental and Theoretical Advances in Microdrilling of Polymers with Ultraviolet Laser Beams",
"url": "https://arxiv.org/abs/physics/0412137"
},
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