Abstract: Through optimizing the tensile-strained single quantum well (SQW) epitaxial structure and introducing double-channel deep isolation groove etching technologies of linear laser diode arrays,GaAsP/GaInP/AlGaInP SQW separate confinement laser emitting structures are grown by low-pressure metal organic chemical vapor deposition and 1cm-wide laser bars with 50% fill factor are fabricated.The cross sections of the channels are analyzed using scanning electron microscope.Mounted on passively cooled copper heat sinks,the laser bars achieve an output power of 259W in quasi-continuous-wave (200μs pulse width and 2% duty cycles) operation at a driving current of 300A,which is the upper limit of power supply in our measurement setup,and no catastrophically optical mirror damage is observed.A peak power conversion efficiency of 52% is obtained at 104A with 100W output power.At a high-power operation of 100W,the spectrum of the bar has a centric wavelength of 807.8nm and full width at half maximum of 2.4nm.The full angles at half maximum power for fast axis and slow axis are 29.3° and 7.5°,respectively.

Key words: laser diode, array, quasi-QW, Al-free