Controlling passive facet reflections

This narrow-band coherent light, (light that is virtually all in-phase and at, or essentially at, the same wavelength) grating-coupled, diode-chip-laser improvement enables, for the first time, combining the functional advantages of non-semiconductor-chip (e.g., fluid) lasers with the efficiency, economy, and convenience of semiconductor-chip-manufacturing (wafer processing), while providing significantly higher power than prior art semiconductor-chip diodes. It utilizes a manufacturable grating that couples output light "vertically" out of a horizontal, active-region-containing core, and generally minimizes reflections that would cause loss and noise. All reflections from the grating back into the active region are essentially eliminated (to less than 0.1% and preferably less than 0.01% of the light diffracted out of said structure). Integrated gratings can also be constructed in a manner to produce other optical functions, similar to any of the modifications that have been done in fluid lasers, but manufactured as part of the solid-state diode.