Polarization beam splitter and method for making the same

Details Polarization beam splitter and method for making the same Polarization beam splitter and method for making the same

1997-09-05

2000-04-04

Spyrou, Cassandra

Optical: systems and elements

Polarization without modulation

Polarization variation over surface of the medium

359495, G02B 530

Patent

active

060468513

ABSTRACT:
Disclosed is a polarization beam splitter which has; a lithium niobate or lithium tantalate substrate which has an in-plane optical axis; proton exchanging regions formed periodically on a surface of the substrate; and phase compensating film regions formed periodically on the proton exchanging regions; wherein each of the proton exchanging regions has a step cross section with 2.sup.n -step depths and each of the phase compensating film regions has a step cross section with 2.sup.n -step thicknesses corresponding to the depths of the each proton exchanging region, where n is an integer of 2 or more. Also disclosed is a method for making a polarization beam splitter which has the steps of: forming periodically first proton exchanging regions with a depth of h.sub.a on a lithium niobate or lithium tantalate substrate which has an in-plane optical axis; forming repeatedly and sequentially n-th proton exchanging regions with a depth of h.sub.a /2.sup.n-1 on a part of substrate or proton exchanging regions; forming periodically first phase compensating film regions with a thickness of h.sub.b on proton exchanging regions; and forming repeatedly n-th phase compensating film regions with a thickness of h.sub.b /2.sup.n-1 on a part of proton exchanging regions or phase compensating film regions; wherein n is an integer of 2 or more.

REFERENCES:
patent: 4991937 (1991-02-01), Urino
patent: 5455712 (1995-10-01), Yamamoto et al.
patent: 5537252 (1996-07-01), Rauch
patent: 5600486 (1997-02-01), Gal et al.
patent: 5739952 (1998-04-01), Takeda et al.
G.J. Swanson, Binary Optics Technology, MIT Lincoln Laboratory, see entire document, Aug. 1989.

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