Patent ID: 6870871

Claim:
A semiconductor laser device comprising: an InP substrate; a resonator cavity disposed on said InP substrate, said resonator cavity having a first facet, a second facet, a cavity length L of at least 1000 microns (μm) between said first and second facets; a strained multi-quantum well structure disposed in said cavity; a low-reflectivity film on the first facet; and a high-reflectivity film on the second facet; and wherein the second facet has a facet reflectivity of about 90% or more, and wherein the facet reflectivity of the first facet has a value between approximately ( 1.64 ⁢ % - L 300 ⁢ ⁢ µ ⁢ ⁢ m × 0.3 ⁢ % ) and approximately ( 9.94 ⁢ % - L 300 ⁢ ⁢ µ ⁢ ⁢ m × 1.3 ⁢ % ) for cavity lengths L between approximately 1000 μm and approximately 1300 μm, a value between approximately ( 1.7 ⁢ % - L 200 ⁢ ⁢ µ ⁢ ⁢ m × 0.21 ⁢ % ) and approximately ( 19.9 ⁢ % - L 200 ⁢ ⁢ µ ⁢ ⁢ m × 2.4 ⁢ % ) for cavity lengths L between approximately 1300 μm and approximately 1500 μm, and a value between approximately ( 0.34 ⁢ % - L 500 ⁢ ⁢ µ ⁢ ⁢ m × 0.07 ⁢ % ) and approximately ( 1.6 ⁢ % + L 500 ⁢ ⁢ µ ⁢ ⁢ m × 0.1 ⁢ % ) for cavity lengths L between approximately 1500 μm and approximately 2000 μm.