Laser and an amplifier
CA 2090680 C · Owner: Hunt, Michael Harold · Inventors: Hunt, Michael Harold; Brierley, Michael Charles; Millar, Colin Anderson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An 850 nm laser and/or amplifier comprises a single mode fluoro-zirconate optical fibre (20) doped with Er3+. CW operation of the normally self-terminating lasing transition 4S3/2 to 4I13/2 is achieved by applying excitation energy at 801 nm which both maintains a population inversion between the lasing levels and also populates the upper lasing level by a twostage process of excitation to the 4I9/2 level from the 4I15/2 ground state and then to 2H9/2 level by ESA.
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
- Filed September 5, 1991 and granted August 19, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 2013.
- 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.