Low swap two-phase cooled diode laser package

An apparatus, comprising:

• a conductive block including a base surface and a plurality of parallel stepped surfaces opposite the base surface and defining respective mounting surfaces situated to receive respective laser diodes having respective thermal paths defining a common thermal path distance from the mounting surfaces to the base surface;
• and
• a two-phase cooling unit including a coupling surface attached to the base surface of the conductive block and wherein the two-phase cooling unit is situated to conduct heat generated through the emission of laser beams from the laser diodes along the thermal paths;
• wherein the laser diodes on the mounting surfaces emit the laser beams along respective parallel emission axes in a common direction and a common plane that is parallel to the base surface;
• wherein the conductive block includes a plurality of stepped mounting block surfaces situated to receive respective stepped mounting blocks, each stepped mounting block including a plurality of the parallel stepped surfaces.

An apparatus, comprising:

• a conductive block including a base surface and a plurality of parallel stepped surfaces opposite the base surface and defining respective mounting surfaces situated to receive respective laser diodes having respective thermal paths defining a common thermal path distance from the mounting surfaces to the base surface;
• and
• a two-phase cooling unit including a coupling surface attached to the base surface of the conductive block and wherein the two-phase cooling unit is situated to conduct heat generated through the emission of laser beams from the laser diodes along the thermal paths, wherein the laser diodes on the mounting surfaces emit the laser beams along respective parallel emission axes in a common direction and a common plane that is parallel to the base surface, wherein the laser beams have fast axes and slow axes mutually perpendicular to each other and to the emission axes, wherein the fast axes correspond to a fast beam divergence associated with a thickness of an emission region of the laser diodes in a corresponding semiconductor growth direction;
• a plurality of groups of slow axis collimators and turning mirrors, each group situated on a respective surface parallel or common to a respective one of the mounting block surfaces, wherein the turning mirrors are situated to reflect the laser beams into a common stack propagation direction having the emission axes and the fast axes forming a common stacking plane;
• an optical fiber;
• and
• coupling optics situated to receive the laser beams from the common stack propagation direction and to couple the laser beams into an end of the optical fiber;
• wherein an NA of the optical fiber is underfilled with respect to the NA of the laser beams directed into the end of the optical fiber such that the end of the optical fiber and a fiber termination housing that surrounds the end of the optical fiber are not directly coupled to a cooling channel of the two-phase cooling unit.