Laser apparatus and laser generation method

A laser apparatus, comprising:

• an optical reflection and gain unit having a gain medium and at least two dichroic surfaces, the optical reflection and gain unit configured to generate a laser beam;
• a plurality of optical modulation units configured to form a laser cavity with the optical reflection and gain unit, wherein the optical modulation units respectively correspond to a plurality of phase boundaries in the laser cavity, so as to allow an optical field in the laser cavity to pass at least two of the optical modulation units;
• and
• a plurality of polarizing selection units each arranged between the optical reflection and gain unit and a corresponding one of the optical modulation units, the polarizing selection units respectively configured to adjust a polarizing direction of the optical field incident to the optical modulation units.

A laser generation method, comprising:

• providing an optical reflection and gain unit and an optical modulation unit, the optical reflection and gain unit having a gain medium and at least two dichroic surfaces;
• arranging the optical modulation unit, such that a plurality of portions of the optical modulation unit form a laser cavity with the optical reflection and gain unit, wherein the portions of the optical modulation unit respectively correspond to a plurality of phase boundaries in the laser cavity;
• arranging a polarizing selection unit between the optical reflection and gain unit and the optical modulation unit, wherein the polarizing selection unit is configured to adjust a polarizing direction of an optical field incident to the optical modulation unit;
• generating a laser beam by a pump and the optical reflection and gain unit, wherein the laser beam completes a full path of oscillating back and forth in the laser cavity, so as to allow an optical field in the laser cavity to pass through the optical modulation unit at least twice;
• and
• inputting a control signal to the optical modulation unit to adjust a pattern of a reflected optical field that passes the optical modulation unit, so as to achieve control of an output mode of the laser beam.