Controlling high-precise aberration

• - Large-thin glass polishing : 1 newton ring at Ø50mm
• - Bending control at high temperature
• - Aberration Analysis (PV, AS3, Coma3, SP3)

3-wavelength integrated optical component

• - Meet required spectral characteristics (Transmittance, Reflectance, Phase difference) at BD,DVD,CD
• - Slim
• - Cost effect

3-wavelength integrated optical component

	2OL(2LD)	1OL(2LD)	1LD(1OL)
Optical pickup
Optical system
Features	Implementing Blue Ray by making use of a pair of components	A single component used on OL; however, prism of higher cost or multiple MR’s used	Achieving compact design and cost saving by making use of 3-wavelength integrated optical components

Features of 3-wavelength spectrometry

Grating of high diffraction spectrometric ratio

• - Shallow Depth Control
• - Solve Undercut problem by Dry Etching