title: Femtosecond laser-written high-efficiency blazed phase gratings in the volume of soda lime glass for light management in solar modules.
abstract: Highly efficient volume phase gratings have been fabricated in low-iron soda lime glass using femtosecond (fs) laser pulses with 1030 nm wavelength and 270 fs pulse duration. Optical simulations based on rigorous coupled-wave analysis theory were performed to determine optimal grating parameters and designs for the application of the gratings for light management in solar modules, suggesting a very effective blazed-like design. Several of such blazed phase gratings have been fabricated and analyzed by measuring their diffraction efficiencies into first and higher orders. Up to 77% of the incoming light in the wavelength region relevant for silicon-based photovoltaics were diffracted by these gratings. Typical induced refractive index changes between 0.002 and 0.006 were derived by comparing the experimental efficiencies with the simulation results.
authors.forename: Markus
authors.initials: M
authors.lastname: Muchow
authors.forename: Torsten
authors.initials: T
authors.lastname: Büchner
authors.forename: Alexander
authors.initials: A
authors.lastname: Sprafke
authors.forename: Gerhard
authors.initials: G
authors.lastname: Seifert