Three-dimensional object generating apparatus

A three-dimensional (3D) object generating apparatus comprising:

• an optical-transparent component comprising a working region;
• a laser light generating module comprising:
• a light emitter for outputting a spot beam;
• a polygon mirror rotatable around an axis for directing the spot beam into a linear beam;
• a flat-field convergent lens positioned between the laser light generating module and the optical-transparent component, wherein a flat-field scanning route is formed after the linear beam passed through the flat-field convergence lens, and the working region is within a coverage of the flat-field scanning route,
• a flat-field optical sensor positioned on the flat-field scanning route, wherein the flat-field optical sensor senses an optical power of the linear beam and generates a sensed signal based on the optical power of the linear beam;
• and
• a controller electrically connected to the laser light generating module and the flat-field optical sensor,
• wherein the controller receives the sensed signal and calibrates the optical power of the spot beam based on the sensed signal.