Lines are induced on the surface of a photosensitive (FOTURAN) glass by focused femtosecond laser transverse writing with scanning velocity in a wide range of 40-1800 micron/s. The formed lines are analyzed using scanning electron microscope (SEM) and optical microscope (OM). It is observed that three distinct morphologies of lines are produced depending on the scanning velocity. Lines written in low velocity level (40-100 micron/s) and high velocity level (1000-1800 micron/s) are uniform and regular, while those written in moderate velocity level (150-600 micron/s) are rough. The influence of scanning velocity is explained based on different pulses overlapping or cumulative dose of laser exposure in irradiated area. Fabrication of shallow groove on the surface is also demonstrated.
© 2008 Chinese Optics Letters
(130.3120) Integrated optics : Integrated optics devices
(140.3390) Lasers and laser optics : Laser materials processing
(140.7090) Lasers and laser optics : Ultrafast lasers
(230.4000) Optical devices : Microstructure fabrication
Yinzhong Wu, Ching-Yue Wang, Wei Jia, Xiaochang Ni, Minglie Hu, and Lu Chai, "Influence of scanning velocity on femtosecond laser direct writing lines on FOTURAN glass," Chin. Opt. Lett. 6, 51-53 (2008)