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We demonstrate both common electrode and addressable arrays of single mode semiconductor lasers suitable for optical computing and optical data storage. In the common electrode geometry, eight lasers have been fabricated on a single chip which show excellent spectra land power uniformity. Total optical power obtained from this array has been in excess of 1.2 Watts CW. We have also fabricated two and nine element monolithic, individually addressable arrays with emitter spacings between 10 micron and 150 micron. Separately addressed, each element emits in a single spatial mode to greater than 01. Watts. For the nine element array, uniformity of better than 1.0 nanometer in wavelength and 1.0 milliamp in operating current across the array has ben obtained. Results on crosstalk and reliability of the arrays are presented.