Ablation experiments with femtosecond (fs) laser pulse (pulse duration 37 fs, wavelength 800 nm) on organic polymers have been performed in air. The ablation threshold is found to be only several nanojoules. The diameters of the dots ablated in the organic polymers are influenced by the laser fluence and the number of laser pulses. It is observed that heat is diffused in a threadlike manner in all directions around the central focus region.Explanations of the observed phenomena are resented. A one-dimensional waveguide is also ablated in the organic polymers.
© 2005 Chinese Optics Letters
(140.7090) Lasers and laser optics : Ultrafast lasers
(190.4400) Nonlinear optics : Nonlinear optics, materials
(210.4810) Optical data storage : Optical storage-recording materials
(230.4000) Optical devices : Microstructure fabrication
Xiaochang Ni, Ching-Yue Wang, Yanfeng Li, Minglie Hu, Zhuan Wang, and Lu Chai, "Thermal character in organic polymers with nanojoule femtosecond laser ablation," Chin. Opt. Lett. 1, 547-549 (2003)