Efficient power scaling of laser radiation by spectral beam combining.
The possibility of achieving multikilowatt laser radiation by spectrally combining beams using volume Bragg gratings (VBGs) is shown. The VBGs recorded in a photothermorefractive glass exhibit long-term stability of all its parameters in high-power laser beams with power density >1 MW/cm2 in the cw beam of total power on a kilowatt level. We consider an architecture-specific beam-combining scheme and address the cross-talk minimization problem based on optimal channel positioning. Five-channel high efficiency spectral beam combining resulted in a >750 W near-diffraction-limited cw beam has been demonstrated experimentally.
Sevian
Armen
A
CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA. asevian@creol.ucf.edu
Andrusyak
Oleksiy
O
Ciapurin
Igor
I
Smirnov
Vadim
V
Venus
George
G
Glebov
Leonid
L