Laser module and laser apparatus

A laser module comprising:

• a laser device that emits a laser beam comprising:
• a major polarization component;
• and
• a minor polarization component having:
• a power lower than a power of the major polarization component;
• and
• a polarization direction inclined at an angle of 90 degrees with respect to a polarization direction of the major polarization component;
• a beam splitter that splits the laser beam into the major polarization component and the minor polarization component and that directs the major polarization component and the minor polarization component in different directions;
• an optical fiber that is optically coupled to the major polarization component split by the beam splitter and externally outputs the major polarization component;
• a package housing that houses the laser device and that has an inner surface comprising a minor polarization component irradiation portion that is irradiated by the minor polarization component split by the beam splitter;
• and
• a temperature measurement element that is attached to the package housing and that detects a temperature change of the minor polarization component irradiation portion.