Laser beam combining system

A laser beam combining system, comprising:

• at least one beam combining unit;
• the beam combining unit comprises a reflective device, a polarization conversion element and a beam combining device;
• the reflective device comprises two reflective surfaces configured to divide a high-polarization laser incident on the reflective device into a first beam and a second beam respectively reflected in different directions;
• the first beam is guided to enter the beam combining device and the polarization conversion element is provided on a propagation path of the second beam;
• the polarization conversion element is configured to convert the second beam into a light having a polarization direction perpendicular to an original polarization direction of the second beam;
• the converted light is guided to the beam combining device which is configured to combine the first beam and the converted light into one beam for outputting.