Laser machining of special designed photopolymers - Photochemical ablation mechanism

Thomas Lippert, J. T. Dickinson, S. C. Langford, H. Furutani, H. Fukumura, H. Masuhara, T. Kunz, A. Wokaun

Research output: Contribution to journalConference articlepeer-review


Photopolymers based on the triazeno chromophore group (-N=N-N<) have been developed. The absorption properties can be tailored for a specific irradiation wavelength (e.g. 308 nm XeCl laser). The photochemical exothermic decomposition yields high energetic gaseous products which are not contaminating the surface. The polymer can be structured with high resolution. No debris has been found around the etched corners. Maximum ablation rates of about 3 μm / pulse were achieved due to the dynamic absorption behavior (bleaching during the pulse). No physical or chemical modifications of the polymer surface could be detected after irradiation at the tailored absorption wavelength, whereas irradiation at different wavelengths resulted in modified (physical and chemical) surfaces. The etching of the polymer starts and ends with the laser pulse, shown by ns-interferometry, confirming that the acting mechanism is mainly photochemical. TOF-MS revealed fragments which are also totally compatible with a photochemical decomposition mechanism.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1997 Dec 1
EventALT 1997 International Conference on Laser Surface Processing - Limoges, France
Duration: 1997 Sep 81997 Sep 12


  • Excimer laser
  • Laser ablation
  • Mechanism
  • Photopolymer
  • Triazenopolymer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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