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Published March 2009 | Published
Journal Article Open

Coherent power combination of semiconductor lasers using optical phase-lock loops

Abstract

Heterodyne optical phase-lock loops (OPLLs) enable the precise electronic control over the frequency and phase of a semiconductor laser (SCL) locked to a ldquomasterrdquo reference laser. One of the more interesting applications of OPLLs is the creation of coherent arrays by locking a number of ldquoslaverdquo SCLs to a common master laser. In this paper, we demonstrate the coherent power combination of various high-power semiconductor lasers using OPLLs in both the filled-aperture and tiled-aperture configurations. We further demonstrate the electronic control over the phase of each individual SCL using a voltage-controlled oscillator. It is feasible to combine a large number of SCLs using this approach, leading to compact, efficient, and cost-effective high-power and high-radiance optical sources.

Additional Information

© 2009 IEEE. Manuscript received September 29, 2008; revised November 24, 2008. Current version published April 8, 2009. This work was supported by the Defense Advanced Research Projects Agency's (DARPA) Microsystems Technology Office (MTO). This paper was a collaborative effort between Caltech, Telaris, Inc., and the University of Southern California, and was supported by the Defense Advanced Research Projects Agency (DARPA) (Microsystems Technology Office (MTO), Architecture for Diode High Energy Laser Systems (ADHELS) Program). The authors gratefully acknowledge their collaborators F. Aflatouni and Prof. Hashemi at the USC.

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August 21, 2023
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