Reduction of undesired hyperfine line absorption in optical reso

Details Reduction of undesired hyperfine line absorption in optical reso Reduction of undesired hyperfine line absorption in optical reso

1990-10-17

1992-07-14

Berman, Jack I.

Radiant energy

Luminophor irradiation

359886, G02B 520

Patent

active

051305461

ABSTRACT:
A spectral bandpass filter with a sharp angle independent absorption edge for reducing optical noise is used in conjunction with a known atomic resonance filter-detector or QLORD detector such as described in U.S. Pat. No. 4,292,526. The QLORD detector comprises two spectral bandpass filters enclosing or sandwiching a chamber containing atomic vapor. In accordance with the present invention, between the high-pass filter and the atomic vapor is placed a strip of volume absorbing filter material. The high pass filter has already admitted light which can be absorbed by the atomic vapor thereby excluding that incoming light which is in the spectral range of the light readmitted by radiative decay. The volume absorbing material then makes the further attenuative selection between the various sets of hyperfine lines. The line or lines which absorb the incoming signals are not attenuated; and the incoming light present as optical noise which could be absorbed by other hyperfine lines is strongly attenuated thereby minimizing that source of noise. In a preferred embodiment of the present invention, a volume filter is inserted to remove one of a set of two hyperfine lines, with optical transmission taking place through the other set of lines.

REFERENCES:
patent: 4292526 (1981-09-01), Marling
patent: 4728794 (1988-03-01), Allen
patent: 4829597 (1989-05-01), Gelbwachs

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