Device and method for producing coherent bi-color light source

A method for producing a coherent bi-color light source, the method comprising:

• 1) acquiring a horizontally linearly polarized monochromatic laser beam and a frequency modulated (FM) horizontally linearly polarized multi-chromatic laser beam;
• 2) converting the horizontally linearly polarized monochromatic laser beam into a vertically linearly polarized monochromatic laser beam, and combining the vertically linearly polarized monochromatic laser beam with the FM horizontally linearly polarized multi-chromatic laser beam;
• 3) converting the vertically linearly polarized monochromatic laser beam into a left-handed circularly polarized monochromatic laser beam, and converting the FM horizontally linearly polarized multi-chromatic laser beam into an FM right-handed circularly polarized multi-chromatic laser beam;
• 4) reflecting a part of the left-handed circularly polarized monochromatic laser beam, converting a reflected left-handed circularly polarized monochromatic laser beam into a horizontally linearly polarized monochromatic laser beam, and injecting the horizontally linearly polarized monochromatic laser beam into the FM horizontally linearly polarized multi-chromatic laser beam;
• meanwhile, reflecting a part of the FM right-handed circularly polarized multi-chromatic laser beam, converting a reflected FM right-handed circularly polarized multi-chromatic laser beam into a FM horizontally linearly polarized multi-chromatic laser beam, and injecting the FM horizontally linearly polarized multi-chromatic laser beam into the horizontally linearly polarized monochromatic laser beam;
• and
• 5) converting a transmitted left-handed circularly polarized monochromatic laser beam and a transmitted FM right-handed circularly polarized multi-chromatic laser beam obtained from inter-injection-locking into a vertically linearly polarized monochromatic laser beam and a FM horizontally linearly polarized multi-chromatic laser beam, respectively, and obtaining a coherent bi-color laser beam that having inter-perpendicular polarization directions.