Large area high efficiency broad bandwidth 800 nm dielectric gratings for high energy laser pulse compression

MARTZ, D.; NGUYEN, H.T.; PATEL, D.; BRITTEN, J.A.; ALESSI, D.; KROUS, E.; WANG, Y.; LAROTONDA, M.A.; GEORGE, J.; KNOLLENBERG, B; LUTHER, B. M.; ROCCA, J. J.; MENONI, C. S.

OPTICS EXPRESS

Optical Society of America

Lugar: Washington, D.C.; Año: 2010 vol. 17 p. 23809 - 23816

1094-4087

We have demonstrated broad bandwidth large area (229 mm x 114 mm) multilayer dielectric diffraction gratings for the efficient compression of high energy 800 nm laser pulses at high average power. The gratings are etched in the top layers of an aperiodic (Nb0.5Ta0.5)2O_5-SiO_2 multilayer coating deposited by ion beam sputtering. The mean efficiency of the grating across the area is better than 97% at the center wavelength and remains above 96% at wavelengths between 820 nm and 780 nm. The gratings were used to compress 5.5 J pulses from a Ti:sapphire laser with an efficiency above 80 percent.