High-power quasi-continuous wave operation (0.97 /spl mu/m) Al-free diode lasers

100 /spl mu/m-wide stripe, 0.97 /spl mu/m-emitting Al-free InGaAsP-InGaP-GaAs QW lasers, demonstrate a record value for quasi-CW output power, 14.3 W, low internal losses (/spl alpha/=1 cm/sup -1/), and high differential quantum efficiency (86% for 2 mm-long lasers). Long cavity, large-stripe devices exhibit relatively small spectral broadening with increased output power.