Laser source with broadband spectrum emission
Patent No. 7,555,027
Issued: June 30, 2009
Inventors: Kovsh; Alexey (Dortmund, DE), Gubenko; Alexey (Dortmund, DE),
Zhukov; Alexey (St. Petersburg, RU), Livshits; Daniil (Dortmund, DE), Krestnikov;
Igor (Dortmund, DE)
A quantum dot laser operates on a quantum dot ground-state optical transition. The laser has a broadband (preferably .gtoreq.15 nm) spectrum of emission and a high output power (preferably .gtoreq.100 mW). Special measures control the maximum useful pump level, the total number of quantum dots in the laser active region, the carrier relaxation to the quantum dot ground states, and the carrier excitation from the quantum dot ground states. In one embodiment, a spectrally-selective loss is introduced into the laser resonator in order to suppress lasing on a quantum dot excited-state optical transition, thereby increasing the bandwidth of the emission spectrum.
Reference to Related Applications
This application claims inventions which were disclosed in Provisional Application No. 60/745,641, filed Apr. 26, 2006, entitled "LASER SOURCE WITH BROADBAND SPECTRUM EMISSION" and Provisional Application No. 60/863,443, filed Oct. 30, 2006, entitled "LASER SOURCE WITH BROADBAND SPECTRUM EMISSION". The benefit under 35 USC 119(e) of the U.S. provisional applications is hereby claimed, and the aforementioned applications are hereby incorporated herein by reference. This is also a continuation-in-part of co-pending patent application Ser. No. 11/295,943, filed Dec. 7, 2005, entitled "LASER SOURCE WITH BROADBAND SPECTRUM EMISSION". The aforementioned application is hereby incorporated herein by reference.
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