TY - GEN
T1 - Femtosecond laser micro-structuring of materials in the NIR and UV regime
AU - Liu, Dun
AU - Cheng, J.
AU - Perrie, W.
AU - Baum, A.
AU - Scully, P.
AU - Sharp, M.
AU - Edwardson, S. P.
AU - Kuang, Z.
AU - Semaltianos, N. G.
AU - French, P.
AU - Dearden, G.
AU - Li, L.
AU - Watkins, K. G.
PY - 2007
Y1 - 2007
N2 - Ultrafast laser micro-structuring of ceramic alumina, titanium and stainless steel are presented confirming that precision, melt free micro-structuring is indeed possible with intense femtosecond optical pulses. While metals are best machined at a fluence a few times ablation threshold, ceramic alumina, on the other hand, shows excellent structuring with no evidence of melt at high fluence F ∼ 21Jcm-2. In PMMA, at 387nm with pulselength ∼ 200fs, we demonstrate refractive index modification within the bulk induced by two photon absorption to generate phase gratings. By using a holographic technique combined with 387nm femtosecond radiation and 0.5NA UV objective, submicron pitch periodic structures were ablated on stainless steel, titanium and silicon. With a lower (0.15NA) objective and focussing the periodic optical field distribution within bulk PMMA, micron pitch phase gratings can be generated.
AB - Ultrafast laser micro-structuring of ceramic alumina, titanium and stainless steel are presented confirming that precision, melt free micro-structuring is indeed possible with intense femtosecond optical pulses. While metals are best machined at a fluence a few times ablation threshold, ceramic alumina, on the other hand, shows excellent structuring with no evidence of melt at high fluence F ∼ 21Jcm-2. In PMMA, at 387nm with pulselength ∼ 200fs, we demonstrate refractive index modification within the bulk induced by two photon absorption to generate phase gratings. By using a holographic technique combined with 387nm femtosecond radiation and 0.5NA UV objective, submicron pitch periodic structures were ablated on stainless steel, titanium and silicon. With a lower (0.15NA) objective and focussing the periodic optical field distribution within bulk PMMA, micron pitch phase gratings can be generated.
UR - https://www.scopus.com/pages/publications/85086422363
U2 - 10.2351/1.5061111
DO - 10.2351/1.5061111
M3 - Conference Publication
AN - SCOPUS:85086422363
SN - 9780912035888
T3 - 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
BT - 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
PB - Laser Institute of America
T2 - 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007
Y2 - 29 October 2007 through 1 November 2007
ER -