Optical flip-flop

• US 4,930,873 A
• Filed: 09/23/1988
• Issued: 06/05/1990
• Est. Priority Date: 09/23/1988
• Status: Expired due to Fees

• Current Assignee: Bryan D. Hunter
• Original Assignee: Bryan D. Hunter
• Inventors: Hunter, Bryan D.
• Primary Examiner(s): LaRoche, Eugene R.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/248,136
• Time in Patent Office: 620 Days
• Field of Search: 350/354, 350/353, 350/355, 350/356, 350/3.6, 350/3.64, 372/21, 372/22
• US Class Current: 359/108
• CPC Class Codes: G02F 3/00 Optical logic elements; Optical bistable devices

Abstract

An optical flip-flop comprises a phase-conjugating mirror; a one-way mirror having its reflective side facing the phase-conjugating mirror; a "set" light pulse directed towards the phase-conjugating mirror through the transmissive side of the one-way mirror for initiating a reference light beam which thereafter reflects continuously along an auto-collimating path between the mirrors; a normally transmissive optical gate along the path of the reference beam which is rendered nontransmissive relative thereto upon interaction with a "reset" light pulse; a plurality of filters positioned between the mirrors to prevent the self-starting of the reference beam therebetween; and means for deriving an output signal from the reference beam. An optical logic device comprises a plurality of such flip-flops sharing a single set of mirrors, whereby increased system compactness and simplicity is achieved.

Claims

1. An optical flip-flop comprising:

a phase-conjugating mirror;

a reflective element facing said phase-conjugating mirror;

means for initiating a reference beam of coherent electromagnetic radiation reflecting continuously between said phase-conjugating mirror and said reflective element along a path therebetween;

means for terminating said reference beam; and

means for deriving an output beam from said reference beam, said output beam being present only during such continuous reflection of said reference beam between said phase conjugating mirror and said reflective element.

2. The optical flip-flop of claim 1 wherein said reflective element comprises a one-way mirror having a reflective side facing said phase-conjugating mirror and a transmissive side, and said means for initiating said reference beam comprises a pulse of coherent electromagnetic radiation directed through said transmissive side of said one-way mirror towards said phase-conjugating mirror along said path therebetween.

3. The optical flip-flop of claim 2 further comprising a filter interposed between said one-way mirror and said phase-conjugating mirror, said filter preventing spontaneous generation of said reference beam prior to the initiation thereof by said pulse.

4. The optical flip-flop of claim 1 wherein said means for initiating said reference beam comprises a normally nontransmissive optical gate interposed between said reflective element and said phase-conjugating mirror along said path therebetween, said normally nontransmissive optical gate being rendered transmissive when interacting with a pulse of coherent electromagnetic radiation directed theretowards to permit spontaneous generation of said reference beam, said normally nontransmissive optical gate also being transmissive when interacting with said reference beam.

5. The optical flip-flop of claim 1 wherein said means for terminating said reference beam comprises a normally transmissive optical gate positioned along said path of said reference beam between said phase-conjugating mirror and said reflective element, said normally transmissive optical gate being rendered nontransmissive to said reference beam when interacting with a pulse of coherent electromagnetic radiation directed theretowards.

6. The optical flip-flop of claim 1 wherein said means for deriving an output signal from said reference beam comprises a partially reflective lens positioned in the path of said reference beam so as to reflect a portion thereof away from said path.

7. An optical flip-flop comprising

a phase-conjugating mirror;

an element having a reflective surface facing said phase-conjugating mirror;

means for providing a light pulse traveling along a first path between said phase-conjugating mirror and the reflective surface of said element for impingement upon said phase-conjugating mirror, said pulse initiating a first light beam which reflects continuously between said phase-conjugating mirror and the reflective surface of said element along said first path, said phase-conjugating mirror emitting a second light beam along a second path other than said first path during such continuous reflection of said first beam; and

optical gate means positioned along said first path for preventing the continued reflection of said first beam between said phase-conjugating mirror and the reflective surface of said element, whereby the emission of said second beam by said phase-conjugating mirror is prevented.

8. The optical flip-flop of claim 7 wherein said element having a reflective surface comprises a one-way mirror having a reflective side and a transmissive side, and wherein said pulse is directed through said transmissive side of said one-way mirror towards said phase-conjugating mirror along said first path therebetween.

9. The optical flip-flop of claim 8 further comprising a filter interposed between said one-way mirror and said phase-conjugating mirror, said filter preventing spontaneous generation of said first beam therebetween prior to the initiation thereof by said pulse.

10. The optical flip-flop of claim 7 wherein said optical gate means for preventing the continued reflection of said first beam comprises a normally transmissive optical gate which is rendered nontransmissive to said first beam when said optical gate interacts with a light pulse directed theretowards.

11. An optical logic device comprising

a phase-conjugating mirror;

light reflecting means facing said phase-conjugating mirror;

means for initiating a plurality of autocollimated reference light beams reflecting continuously between said phase-conjugating mirror and said light reflecting means along a plurality of discrete paths therebetween, respectively;

means for selectively terminating said reference beams; and

means for deriving an output light beam from each of said reference beams, respectively, each of said output beams being present only during such continuous reflection of its respective reference beam between said phase conjugating mirror and said light reflecting means.

12. The optical logic device of claim 11 wherein said light reflecting means comprises a one-way mirror having a reflective side and a transmissive side, and said means for initiating said reference beams comprises a plurality of light pulses directed through said transmissive side of said one-way mirror towards said phase-conjugating mirror along said paths therebetween, respectively.

13. The optical logic device of claim 12 further comprising a filter interposed between said one-way mirror and said phase-conjugating mirror, said filter preventing spontaneous generation of said reference beams, therebetween prior to the initiation thereof by said plurality of pulses, respectively.

14. The optical logic device of claim 11 wherein said means for initiating said reference beams comprises a plurality of normally nontransmissive optical gates interposed between said phase-conjugating mirror and said light reflecting mirror along said paths therebetween, respectively, said plurality of optical gates being rendered transmissive when interacting with a plurality of light pulses directed theretowards, respectively, said optical gates also being rendered transmissive when interacting with said reference beams, respectively.

15. The optical logic device of claim 11 wherein said means for terminating said reference beams comprises a plurality of normally transmissive optical gates positioned along said paths between said phase-conjugating mirror and said light reflecting mirror, respectively, said plurality of optical gates being rendered nontransmissive to said reference beams, respectively, when interacting with a plurality of light pulses directed theretowards, respectively.

16. The optical logic device of claim 11 wherein said means for deriving said plurality of output beams from said reference beams comprises a partially reflective lens positioned along said paths of said reference beams so as to reflect portions thereof away from said paths, respectively.

17. The optical logic device of claim 11 wherein said phase-conjugating mirror generates a plurality of output light beams during such continuous reflection of said reference beams, respectively, along a second plurality of paths, respectively, other than said paths of said reference beams.