Methods for Coherent Adding of Laser Light with High Phase Accuracy

摘要

Aspects of the implementation of the electronic part of the phase autotuning system of two lasers with zero frequency and phase difference are discussed. The formulation of this task is relevant, it was previously considered in many papers. The value of this technique lies in the potential possibility of increasing the power of the generated beam of laser light by adding together several beams. If zero phase error is not provided, adding of the light beams will not be obtained. In the case of ensuring synphasicity with insufficient accuracy, the addition of powers will not occur completely, the total power will be equal not to the sum of the powers of the input beams, it will be little less. The more precisely the synphase state of the light beams is ensured in the addition setup, the closer the result of the addition is to the sum of the powers of the input beams (that is, the efficiency of the addition will be closer to 100% without taking into account inevitable losses on the optical elements). The main problem related to the difficulty of detecting zero phase difference has not been previously discussed for this task.