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1.2 Fabrication Methods 9
Table 1.1. Comparison of proposed photoforming methods with high resolution
method two-photon absorption super IH process spinner
light source
laser titan-sapphire laser He–Cd laser laser diode
wavelength (nm)780 442 650
power 50kW (peak)1.5mW 0.35mW
resin urethane based urethane based aclyle based
(SCR-500)(Threshold) (DF-200N) a
cubic structure 3-D scanning 3-D scanning stacking
resolution (µm)
depth 2.2 3.0 2.0
lateral 0.62 0.5 1.0
a
Commercially available from Nippon Kayaku Corp.
Photopolymerizable resin
Beam
scanning (Liquid)
Polymerized
Cover solid object
glass
Stage
scanning
Objective
lens
Near-IR light

Photopolymerizable resin
Monitor
Lamp
CCD camera
Objective lens
(NA = 0.85)

Computer

Shutter
x-y scanner
Argon ion Ti:sapphire
laser laser
Fig. 1.10. Photopolymerization stimulated by two-photon-absorption using
Ti:sapphire laser and SCR-500 resin. Reprinted from [1.29] with permission by
S. Kawata, Osaka University, Japan