Abstract

Two separate laser diodes emitting near $980\mathrm{nm}$ were coupled by a thick volume Bragg grating recorded in a photothermorefractive glass. The coupled diodes emitted at the same wavelength with a spectral width narrowed to below the resolution of the spectrum analyzer $(<30\mathrm{pm})$. Coherent emission at a pumping level greater than five times above the threshold was observed for several months with near-unity visibility of the interference pattern.

© 2006 Optical Society of America

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