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Optical parts
Optical glass lens
Ultraprecision plastic lens
C-MOS lens
Hybrid lens
Optical coating
BTF coating

@
aseiBirefringence Thin Film) Coating



BTF (Birefringence thin film) coating is the technology that evaporated coating can have double reflection. This can function what quartz plate or phase contrast film does so far. After the light is transmitted through 1/4 wavelength plate, the phase turns 90 degree.



Performance

ESpecification of wavelength can be changed on request.

Comparison

ase
Quartz plate
Phase contrast film
Thickness
(mmj
0.004{Plate thickness 5in~0.02j 0.76{ Plate thickness
Durability against heat
Good Good Not good
Processing ability for big area
Possible Impossible Possible
Production process
Coating process Polishing Pasting
Functionality
Combined with coating
Other components Pasting on other components

Thickness: In case 1/4 wavelength plate (: 632.8nm) is used

Application
Optical isolator, Optical pickup, LCD/DLP projectors, Optical communication



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