1300-nm, 1550-nm, and 1480-nm wavelength, optically pumped VECSELs based on wafer-fused InAlGaAs/InP-AlGaAs/GaAs gain mirrors with intracavity diamond heat spreaders are described. These devices demonstrate very low thermal impedance of 4?K/W. Maximum CW output of devices with 5 groups of quantum wells shows CW output power of 2.7?W from 180?�µm apertures in both the 1300-nm and the 1550-nm bands. Devices with 3 groups of quantum wells emitting at 1480 nm and with the same aperture size show CW output of 4.8?W. These VECSELs emit a high-quality beam with M 2 beam parameter below 1.6 allowing reaching a coupling efficiency as high as 70% into a single-mode fiber. Maximum value of output power of 6.6?W was reached for 1300?nm wavelength devices with 290?�µm aperture size. Based on these VECSELs, second harmonic emission at 650?nm wavelength with a record output of 3?W and Raman fiber lasers with 0.5?W emission at 1600?nm have been demonstrated.
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