85 °C Continuous-Wave Operation of GaInAsP/InP-Membrane Buried Heterostructure Distributed Feedback Lasers with Polymer Cladding Layer

Abstract

85 °C CW operation of a GaInAsP/InP-membrane distributed feedback laser with polymer cladding layers by optical pumping was achieved for the first time using the Bragg wavelength detuning effect. The irradiated threshold powers obtained at heat sink temperatures of 30 and 85 °C were 2.4 and 10 mW, respectively. The temperature dependence of the lasing wavelength showed a slope of 8.0×10-2 nm/K, which is lower than that of conventional semiconductor lasers due to the athermal effect. The effective thermal resistance of this laser was estimated to be 23 K/mW.