Femtosecond laser ablation experiments were performed using a Ti:sapphire laser with 800 nm wavelength in ambient air and a pulse duration of approximately 40 fs. We found that the laser fluence to breakdown this material is 0.5 J/cm2. The ablation rate varies with the pulse number and pulse energy. Microholes around 200 µm in diameter with various depths are drilled in polyurea areogel samples. The hole quality and the structural details are examined using an optical microscope and a scanning electronic microscope (SEM). The material removal mechanisms are proposed. This work provides insights for micromachining polymers with porous structures using femtosecond laser.
REFERENCES
1.
USPTO Application #: 20060211840
2.
Parmeter
, K. E.
, Milstein
, F.
(1998
) Mechanical properties of silica aerogels
, J. Non-Crst. Solids
, 223
, 179
3.
Lee
, J. K.
, Gould
, G. L.
, Rhine
, W.
(2009
), Polyurea based aerogel for a high performance thermal insulation Material
, J Sol-Gel Sci Technol
49
:209
–220
4.
Ali
, M.
, Wagner
, T.
, Shakoor
, M.
and Molian
P.A.
(2008
), Review of laser nanomachining
. Journal of laser applications
, 20
, 169
5.
Küger
, J
, Kautek
, W.
(2004
) Ultrashort Pulse Laser interaction with Dielectrcs and Polymers
, Adv Polym. Sci
, 168
: 247
–289
6.
Lee
A.
, Judith
, J.
, Dawes
, M.
, and Withford
, M. J.
(2008
), Investigation of femtosecond laser induced thermal ablation of polyethylene
. Journal of laser applications
, 20
, 154
7.
Ding
, L.
, Blavkwel
, R. I.
, Kunzler
, J. F.
, Knox
, W. H.
.(2008
), Femtosecond laser micromaching of waveguides in silicone-based hydrogel polymers
, Applied optics
, 47
, 3100
8.
Sun
, J.
, Longtin
, J.P.
, Norr
, P.M.
(2001
), Ultrafast laser micromachining of silica aerogels
,. Jounal of Non–Crystalline Solid
, 28139
–47
9.
Lazare
, S.
, Lopez
, J.
, Weisbuch
, F.
(1999
), High-aspect-ratio microdrilling in polymericmaterials with intense KrF laser radiation
. Appl. Phys. A
, 69
[Suppl.], S1
–S6
10.
Reyna
, L. G.
, Watson
, Z J.
(1995
), Repetition rate effect on the laser ablation of polymer structures
, J. Appl. Phys
, 78
(5
), 1 September11.
Krüger
, J
, Martin
, S.
, Mädebach
, H.
, Urech
, L.
, Lippert
, T.
, Wokaun
, A.
, Kautek
, W.
(2005
), Femto- and nanosecond laser treatment of doped polymethylmethacrylate
, Applied Surface Science
, 247
, 406
–411
.12.
Mendonca
, C.R.
, Orlando
, S.
, Cosendey
, G.
, Winkler
, M.
, Mazur
, E.
(2007
) Femtosecond laser micromachining in the conjugated polymer MEH–PPV
, Applied Surface Science
, 254
, 1135
–1139
13.
Juodkaz
, S.
, Mizeik
, V.
, Matsuo
, S.
, Ueno
, K.
, and Mawa
, H.
(2008
), Three-Dimensional Micro- and Nano-Structuring of Materials by Tightly Focused Laser Radiation
, Bull. Chem. Soc. Jpn.
Vol. 81
, No. 4
, 411
–448
14.
Lippert
, T.
, Dickinson
, J.T.
Etc (1998
), Photopolymers designed for laser ablation – photochemical ablation mechanism
, Applied Surface Science
, 127-129117-12115.
Srinivasan
, V.
, Smrtic
, M.A.
, and Babu
, S.V.
(1986
), Excimer laser etching of polymer
, J. Appl. Phys
, 59
, 3861
16.
Yin
, I.
, Lee
, S.
, Wen
, X.
, Tolbert
W. A.
, and. Dlotta
, D. D.
(1992
), Direct measurement of polymer temperature during laser ablation using a molecular thermometer
, J. Appl. Phys.
72
(6
), 2440
–2448
17.
Moreno
, P.
, Méndez
C.
, Garcı´a
, A.
, Arias
, I.
, Roso
, L.
(2006
), Femtosecond laser ablation of carbon reinforced polymers
, Applied Surface Science
, 252
, 4110
–4119
18.
Gattass
, R.
, and Mazur
, E.
(2008
), Femtosecond laser micromachining in transparent materials
, Nat. Phot.
, 2
, 219
–225
19.
Urech
, L.
, Lippert
, T.
, Phipps
, C.R.
, Wokaun
, A.
(2007
), Polymer ablation: From fundamentals of polymer design to laser plasma thruster
, Applied Surface Science
, 253
, 6409
–6415
20.
Baudach
, S.
, Kruger
, J.B.
, Kautek
, W.
(2000
), Ultrashort pulse laser ablation of polycarbonate and polymethlmethacrylate
, Applied Surface Science
, 154
-155555
–560
21.
Lippert
, T.
, and Dickinson
, J. T.
(2003
), Chemical and Spectroscopic Aspects of Polymer Ablation: Special Features and Novel Directions
, Chem. Rev
, 103
, 453
–485
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