How to understand the random distributed feedback in random lasers and what is the function of feedback light?

Random laser is a kind of laser that uses random feedback mechanism to produce laser output. Among them, random distribution feedback means that the laser output is reflected back into the laser cavity again, and the positions of the reflection points are randomly distributed, thus forming a random light field mode in the laser cavity and making the laser output more random.

Feedback light plays an important role in random lasers. First of all, the feedback light can increase the optical path in the laser cavity, thus enhancing the amplification effect of the laser. Secondly, the feedback light can also change the light field distribution in the laser cavity, making the output of the laser more random. Finally, the feedback light can also affect the * * vibration frequency of the laser, thus changing the output frequency of the laser.

Generally speaking, random distributed feedback is one of the core principles of random lasers, which can produce highly randomized laser output and has important application value, such as optical communication, optical imaging and other fields.