PHASE-LOCKING LASERS VIA PHASE-CONJUGATE-COUPLED MULTIMODE OPTICAL FIBERS

The combined,properties of phase conjugation and optical fibers offer a novel solution to some problems associated with laser phase locking. Multimode optical fibers provide a propagation path that is simple to align and relatively insensitive to environmental disturbances. Doubl e phase conjugation compensates for modal dispersion, diffusion, and p olarization scrambling and leads to mode-matched coupling between two multilongitudinal-mode helium-neon lasers. Phase locking and spectral line narrowing are reported.