InGaAsP/InP laser heterostructures with step-divergent waveguides and two s
tressed quantum wells were obtained by metalorganic VPE. The lasers emittin
g at 1.55 mu m provide for an intrinsic quantum yield of eta(i) = 85 %. An
optical power of 5.2 W in the continuous operation mode was achieved at a l
aser diode temperature of 10 degrees C. The internal optical losses in the
laser heterostructure studied amount to 3.6 cm(-1), which is comparable wit
h the level of losses in similar structures with uniform divergent waveguid
es. (C) 2000 MAIK "Nauka / Interperiodica".