Laminated wave plate and optical pickup device using the same

Details Laminated wave plate and optical pickup device using the same Laminated wave plate and optical pickup device using the same

2011-08-16

2011-08-16

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010

Reexamination Certificate

active

08000208

ABSTRACT:
A laminated wave plate that corresponds to a plurality of wavelengths including at least two wavelengths of λAand λB, and includes a first wave plate disposed on an incident side and a second wave plate disposed on an emitting side, the first wave plate and the second wave plate being laminated in such a manner that their optical axes are intersected each other, includes the following equations from (1) to (5):in-line-formulae description="In-line Formulae" end="lead"?ΓA1=360°+360°×2NA  (1);in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ΓA2=180°+360°×NA  (2);in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ΓB1=360°×2NB  (3);in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?ΓB2=360°×NB  (4); andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?NB=(ΔnB/ΔnA)×(λA/λB)×(0.5+NA)  (5),in-line-formulae description="In-line Formulae" end="tail"?in whichΓA1is a phase difference of the wavelength λAat the first wave plate,ΓA2is a phase difference of the wavelength λAat the second wave plate,ΓB1is a phase difference of the wavelength λBat the first wave plate,ΓB2is a phase difference of the wavelength λBat the second wave plate,θ1is an in-plane azimuth of the first wave plate,θ2is an in-plane azimuth of the second wave plate,ΔnAis a birefringent difference that is a difference (neA−noA) between a normal ray refractive index noAand an abnormal ray refractive index neAof the wavelength λA, andΔnBis a birefringent difference that is a difference (neB−noB) between a normal ray refractive index noBand an abnormal ray refractive index neBof the wavelength λB,under conditions of θ1=−21°, and θ2=45°.

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