Reducing fluctuations in a radiation beam characteristic
CA 1283694 C · Owner: British Telecommunications Public Limited Company · Inventors: Smith, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for reducing fluctuations such as phase noise in a characteristic of a coherent beam of radiation is described. The apparatus comprises an interferometer for sensing the fluctuation at the first position to generate an interference beam. The interference beam is incident on a radiation detector such as a photodiode which generates an electrical output signal responsive to the intensity of the incident beam. This signal is amplified by an amplifier and fed to a phase modulator. Another portion of the original laser beam is also fed to the phase modulator. The arrangement is such that the phase modulations applied to the beam by the phase modulator under the control of …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 30, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.