Device for optical heterodyne detection and mirror system suitab

Details Device for optical heterodyne detection and mirror system suitab Device for optical heterodyne detection and mirror system suitab

1992-05-11

1993-08-17

Lerner, Martin

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359192, 359487, 359638, G02B 530, G02B 2728, H04B 1006

Patent

active

052374424

ABSTRACT:
In an optical heterodyne or homodyne receiver an optical system (140) is used in which the local oscillator beam (L) is combined with the signal beam (S). Simultaneously, these beams are split into orthogonally polarized sub-beams. For this purpose the optical system (140) comprises polarization-sensitive beam-splitting layers (141a and 141b) and neutral beam-splitting layers (142a and 142b) which function as beam-combining elements. In order to align the directions of the exit sub-beams of the signal beam (.sub.11, S.sub.12, S.sub.2, S.sub.22) and the local oscillator beam (L.sub.11, L.sub.12, L.sub.21, L.sub.22), the angles (.alpha., .beta., .gamma., .delta.) enclosed by the beam-splitting faces are chosen to be such that two angles located opposite each other have a combined magnitude of 180.degree.. This is realised by providing the layers (141a, 142b and 141b, 142a) on side faces of one prism (140a, 140b).

REFERENCES:
patent: 1994531 (1935-03-01), Peck
patent: 2106752 (1938-02-01), Land
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patent: 2737076 (1956-03-01), Rock, Jr.
patent: 4726684 (1988-02-01), Tokumaru
patent: 4933751 (1990-06-01), Shinonaga et al.
patent: 4969730 (1990-11-01), van den Brandt
patent: 5003625 (1991-03-01), Khoe
"Optical Heterodyne Detection" by O. E. DeLange; IEEE Spectrum, Oct. 1968 pp. 77-85.

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