Phase locking of laser diode arrays using a photorefractive Rh:BaTiO-3 crystal

Paul Michael Petersen; Peter Snoer Jensen; Per Michael Johansen

doi:10.1117/12.349253

24 May 1999 Phase locking of laser diode arrays using a photorefractive Rh:BaTiO₃ crystal

Paul Michael Petersen, Peter Snoer Jensen, Per Michael Johansen

Proceedings Volume 3611, Laser Resonators II; (1999) https://doi.org/10.1117/12.349253
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

We have developed an extremely stable phase conjugate single-mode laser diode array with unique spatial and temporal coherence properties. The laser is based on a novel concept of frequency selective phase conjugate feedback. A laser diode array is coupled to the phase conjugate feedback system that comprise a rhodium doped BaTiO₃ crystal, a Fabry-Perot etalon, and a spatial filter. This feedback system forces the laser diode array to operate in a single spatial and a single longitudinal mode. In comparison with the free running laser diode array, the coherence length is increased significantly and the output is close to the diffraction limit. More than 80% of the total energy provided by the free running laser diode array can be extracted from this single-mode laser system.

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Paul Michael Petersen, Peter Snoer Jensen, and Per Michael Johansen "Phase locking of laser diode arrays using a photorefractive Rh:BaTiO₃ crystal", Proc. SPIE 3611, Laser Resonators II, (24 May 1999); https://doi.org/10.1117/12.349253

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KEYWORDS

Semiconductor lasers

Phase conjugation

Crystals

Fabry–Perot interferometers

Laser crystals

Temporal coherence

Mode locking

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