Polarization-independent broadband beam combining grating with over 98% measured diffraction efficiency from 1023 to 1080 nm
- 29 September 2017
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 42 (19), 4016-4019
- https://doi.org/10.1364/ol.42.004016
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 st 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%.
Keywords
Funding Information
- National Natural Science Foundation of China (NSFC) (10704079, 11604352, U1430121, U1630140)
- Shanghai Science and Technology Committee Program (16JC1420600)
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