Semiconductor laser apparatus

A semiconductor laser apparatus comprising:

• a first end surface and a second end surface facing each other;
• an active region for emitting light having a predetermined wavelength, said active region positioned between said first and second end surfaces and extending along a first direction;
• a first reflection structure provided on the first end surface side, said first reflection structure totally reflecting light having propagated through said active region;
• a partial reflection structure provided on the first end surface side and constituting a laser resonator together with said first reflection region, said partial reflection structure transmitting part of the light having propagated through said active region and reflecting the remainder thereof, wherein an end surface of said active region corresponding with said first end surface is divided into a total reflection region and a partial reflection region not overlapping with each other in combination with said first reflection structure and said partial reflection structure;
• and
• a second reflection structure provided on the second end surface side to be positioned on the way of a resonance optical path of the laser resonator constituted by said first reflection structure and said partial reflection structure, said second reflection structure totally reflecting the light having propagated through said active region.