We have designed and built a single-crystal fiber growth apparatus. The apparatus employs novel optical, mechanical, and electronic control systems that enable the growth of high optical quality single-crystal fibers. We have grown oriented single-crystal fibers of four refractory oxide materials, Al2O3, Cr:Al2O3, Nd:YAG, and LiNbO3. These materials exhibit similar growth characteristics and yield fibers of comparable quality. Fibers as small as 20 μm in diameter and as long as 20 cm have been grown. Measured optical losses at 1.06 μm for a 10-cm-long, 170-μm-diam Cr:Al2O3 fiber were 0.074 dB/cm.

We present operating and lifetest data on 795 and 808 nm bars with aluminum-free active regions. Conductively cooled bars operate reliably at CW power outputs of 40 W, and have high efficiency, low beam divergence, and narrow spectra. Record CW powers of 115 W CW are demonstrated at 795 nm for 30% fill-factor bars mounted on microchannel coolers. We also review QCW performance and lifetime for higher fill-factor bars processed on identical epitaxial material.

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The frequency dispersion of integrated optic interferometers fabricated on different lithium niobate cuts is characterized. Only the configuration that uses the r33 electrooptic coefficient is well behaved. ABSTRACTThe frequency dispersion of integrated optic interferometers fabricated on different lithium niobate cuts is characterized. Only the configuration that uses the r33 electrooptic coefficient is well behaved.