Temperature characteristics of tilted wave lasers

We report on the temperature characteristics of edge-emitting tilted wave lasers (TWL) composed of a thin active waveguide ( 0.7   μ m ) optically coupled to a thick passive waveguide ( 26   μ m ). The active region is based on four 1040-nm InGaAs/GaAs quantum wells. The 2-mm-long and 50- μ m -wide broad area lasers show characteristic temperature of 115 K and lasing up to 120°C in the continuous-wave mode. The maximal pulsed output power as high as 40 W was achieved being limited by the available current source. Vertical far-fields of the TWLs consist of two tilted narrow lobs (2.4 deg full width at half maximum each), which contain >70% of the total output power. The tilt angle of the lobes slightly increases with the temperature (by 1 deg/40°C ) due to the transverse mode hopping caused by the temperature-induced changes of the waveguide refractive indices.