Abstract

Butt coupling efficiencies as high as 78% and averaging over 65% have been observed in coupling light from constricted double heterostructure large optical cavity lasers (CDH-LOC)⁽¹⁾ to both Ti-LiNbO₃⁽²⁾ and Nb-LiTaO₃⁽³⁾ optical waveguides. Power levels in the waveguide of 13 mW (cw) and 27 mW (5 μs 5% duty cycle pulses) have also been observed. These are the highest reported efficiencies and powers coupled by any means from diode lasers to LiNbO₃ waveguides. The observations support the theory relating beam waist size to coupling efficiency⁽⁴⁾ at very high waveguide powers and coupling efficiencies.

© 1982 Optical Society of America