Method of stabilizing the frequency of semiconductor laser and apparatus therefor
CA 2012262 C · Owner: Kubodera, Kenichi · Inventors: Yoshikuni, Yuzo; Yokohama, Itaru; Sakai, Yoshihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of stabilizing frequency of a semiconductor laser is described. The method comprises stabilizing timedependent frequency fluctuation by utilizing an absorption line of an isotope acetylene gas molecule. The method can be practiced with an apparatus for stabilizing frequency of a semiconductor laser, which comprises a semiconductor laser, an optical absorptional material a photodetector, and a control circuit as essential elements. The optical absorptional material has optical absorption characteristics utilizing an absorption line of an isotope acetylene molecule.
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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
- Filed March 15, 1990 and granted February 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2012.
- 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
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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.