US4565426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam splitter
Assignee: Individual
•
Filing: 1983-05-02
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Granted: 1986-01-21
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Expires: 2003-05-02
Abstract
Abstract The invention provides beam splitter for use in high power multi-wavelength laser holography. The beam splitter comprises a bi-refringent prism 12 through which passes the beam to be split the prism 12 splitting the beam into two separate beams having mutually orthogonal polarization planes. A half-wave plate 16,18 is arranged in the path of at least one of the separated beams to enable the planes of polarization of the separated beams to be realigned. Two further prisms 14, each arranged in the path of a respective one of the separated beams, serve to compensate for the dispersion of the wavelengths of the incident beam by the bi-refringent prism 12.
Inventors
- 👤 Ralph A. W. Cullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:03
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G02; G02B; G02B27/00; G02B27/10; G02B27/12; G02B27/126; G03H2001/0208; G03H2001/0216; G03H2222/00; G03H2222/10; G03H2222/17; G03H2222/18; G03H2223/00; G03H2223/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A beam splitter for use in high power multi-wavelength laser holography, comprising a bi-refringent prism through which the beam to be split is arranged to pass and operative to split the beam into two separate beams having mutually orthogonal polarization planes, said bi-refringent prism causing a predetermined degree of dispersion of said two separate beams, a half-wave plate arranged in the path of at least one of the separated beams to be realigned, and first and second additional prisms arranged in the paths of each of said two separate beams to compensate for said dispersion of the wavelength of the incident beam by said bi-refringent prism.
Claim 2
Dependent Claim
106 words
A beam splitter for use in high power multi-wavelength laser holography, comprising a bi-refringent prism through which the beam to be split is arranged to pass and operative to split the beam into two separate beams having mutually orthogonal polarization planes, said bi-refringent prism causing a predetermined degree of dispersion of said two separate beams, a half-wave plate arranged in the path of at least one of the separated beams to be realigned, and first and second additional prisms arranged in the paths of each of said two separate beams to compensate for said dispersion of the wavelength of the incident beam by said bi-refringent prism.
Claim 3
Dependent Claim
38 words
The beam splitter of claim 1, wherein said beam to be split is arranged to pass through the bi-refringent prism in a manner such that one of said two separated beams is at the angle of minimum deviation.
Claim 4
Dependent Claim
63 words
The beam splitter of claim 1, wherein said half-wave plate arranged in the path of at least one of said separated beams comprises a first half-wave plate, and including a second half-wave plate arranged in the path of said beam incident upon said bi-refringent prism, said second half-wave plate being rotatable to enable the relative power of said separated beams to be varied.
Claim 5
Dependent Claim
52 words
The beam splitter of claim 1, wherein said half-wave plate comprises a first half-wave plate, and including a second half-wave plate, said first and second half-wave plates being arranged in the paths of both of said separated beams to allow the planes of rotation of both said separated beams to be rotated.
Claim 6
Dependent Claim
12 words
The beam splitter of claim 1, wherein said bi-refringent prism comprises calcite.
References Cited (Backward Citations)
US3195397A
Cited
US3495892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |