Condenser

An optical condenser device comprising:

• a first light source;
• a second light source;
• and
• a first optical combiner for combining beams from the first light source with beams from the second light source,
• the first light source having a first semiconductor laser array stack in which a plurality of semiconductor laser arrays, each having a plurality of active layers aligned in parallel in a first direction, are stacked in a direction perpendicular to the first direction, a first collimator lens for collimating a plurality of beams in a plane perpendicular to the first direction, which beams are emitted from the plurality of active layers, and a first beam converter for receiving the beams collimated by the first collimator lens to rotate the transverse section of each beam by substantially 90°,
• the second light source having a second semiconductor laser array stack in which a plurality of semiconductor laser arrays, each having a plurality of active layers aligned in parallel in a second direction, are stacked in a direction perpendicular to the second direction, a second collimator lens for collimating a plurality of beams in a plane perpendicular to the second direction, which beams emitted from the plurality of active layers, and a second beam converter for receiving the beams collimated by the second collimator lens to rotate the transverse section of each beam by substantially 90°, and
• the first optical combiner having one or more transmitting portions for receiving and transmitting the beams emitted from the first beam converter and one or more reflecting portions for receiving and reflecting the beams emitted from the second beam converter to combine the beams transmitted through the transmitting portions with the beams reflected by the reflecting portions, wherein
• the transmitting portions and the reflecting portions of the first optical combiner both have strip-like shapes elongated in the direction of stacking of the laser arrays, and
• the first optical combiner is a flat plate having the transmitting portions and the reflecting portions positioned alternately.