Abstract

We report a grating solution for achieving broadband and polarization-independent properties that brings a laser combining system to much higher power levels. The grating, with a high-refractive-index-contrast bilayer ridge, was designed and successfully fabricated based on high-power laser coatings, lithography, and ion-beam etching technology. The measured 1st order non-polarized reflective diffraction efficiency of the grating exceeds 98% over the wavelength range of 1.023–1.08 μm, and the highest value is 99.15%.

© 2017 Optical Society of America

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