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The lasing threshold is the lowest excitation level at which a laser's output is dominated by stimulated emission rather than by spontaneous emission. Below the threshold, the laser's output power rises slowly with increasing excitation. Above threshold, the slope of power vs. excitation is orders of magnitude greater. The linewidth of the laser's emission also becomes orders of magnitude smaller above the threshold than it is below. Above the threshold, the laser is said to be lasing. The term "lasing" is a back formation from "laser," which is an acronym, not an agent noun.
Current-confined multi-junction diode-laser bar
An edge-emitting diode-laser bar comprises a plurality of diode-laser junctions. The diode-laser junctions are vertically arranged and separated by tunneling junctions. Each diode-laser junction is overlaid by a current confinement layer. Together, these current confinement layers laterally constrain current flow through emitters in this semiconductor structure. Active regions in vertically-aligned emitters have the same current density. Vertically-aligned emitters have the same threshold current for lasing and the same optical output power. A plurality of such diode-laser bars is assembled into a high-output-power high-brightness vertical stack.
Owner:II VI DELAWARE INC