Incoherent Combining of High-Power Laser Beams by Volume Diffractive Gratings in a Photosensitive Silicate Glass

摘要

A model for spectral beam combining by means of transmitting Bragg gratings is developed. (1) Combining efficiency exceeding 92% for two 100-W Yb- fiber lasers by optimization of Bragg gratings and optical setup is achieved. No deterioration of PTR Bragg grating occurred at this level of laser power. (2) It is shown that combining efficiency of about 99% by means of PTR Bragg gratings could be reached with the use 0 high-power lasers with narrow-line and low divergence. (3) High density spectral combining enables creation of multi- kilowatt laser systems for military and industrial applications.