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US Patent 9112329 Thulium laser

Patent 9112329 was granted and assigned to Massachusetts Institute of Technology on August, 2015 by the United States Patent and Trademark Office.

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Current Assignee
Massachusetts Institute of Technology
Massachusetts Institute of Technology
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
9112329
Date of Patent
August 18, 2015
Patent Application Number
13949864
Date Filed
July 24, 2013
Patent Citations Received
‌
US Patent 11670903 Broadband hybrid optical amplifier operation in eye-safe wavelength region
0
Patent Primary Examiner
‌
Eric Bolda
Patent abstract

Stimulating emission via thulium's lasing transition from the 3H4 manifold to the 3H6 manifold yields light at wavelength of about 820 nm. Unfortunately, excited thulium ions also transition from the 3H4 manifold to the long-lived 3F4 manifold, where they become trapped and can no longer participate in the lasing transition. If the enough of the thulium population becomes trapped in the 3F4 manifold, the gain medium becomes transparent at the pump wavelength, rendering population inversion difficult or impossible. Fortunately, the size of the population in the 3F4 manifold can be limited by selecting an appropriate crystal host and thulium doping concentration, pumping the thulium with pulses shorter than the 3F4 manifold's lifetime, cooling the gain medium to low temperature (e.g., 77 K), stimulating emission from the 3F4 manifold, upconversion pumping of the thulium from the 3F4 manifold to the 3H4 manifold, or transferring energy from thulium in the 3F4 manifold to a co-dopant.

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