Abstract

Multi mode-optical-fiber beam-delivery systems with lengths of more than 1 m produce a severely distorted and highly depolarized output beam, even when the initial high-power laser beam is nearly diffraction limited and is linearly polarized. Correction of these fiber distortions by using a Brillouin phase-conjugate mirror (PCM) has been previously demonstrated¹ in short (2-m) fibers having core diameters ≤400 μm. Most high-power applications require longer lengths and larger core sizes.

© 1995 Optical Society of America