Patent ID: 9726834
Date: 2017-08-08
CPC Classifications: B23K,G02B,G02F,H01S

Claim:
1. A beam-parameter adjustment system and focusing system for receiving and altering a spatial power distribution of a radiation beam from a beam source and focusing the radiation with the altered spatial power distribution onto an end face of an optical fiber, the system comprising: an acousto-optic element for receiving the radiation beam and diffracting at least a portion of the radiation beam into a plurality of different orders; a first acoustic transducer for generating sound waves within at least a first portion of the acousto-optic element, thereby altering an index of refraction of at least the first portion of the acousto-optic element in a periodic pattern; focusing optics for receiving the plurality of orders from the acousto-optic element and focusing the orders on the end face; and a controller for controlling the first acoustic transducer and/or the acousto-optic element to achieve a target altered spatial power distribution on the end face, wherein (i) the first acoustic transducer is configured to generate sound waves only within the first portion of the acousto-optic element, whereby an index of refraction of a second portion of the acousto-optic element remains unaltered, and (ii) the second portion of the acousto-optic element is configured to receive at least a portion of the radiation beam.