We report on highly efficient transmission gratings in fused silica with a grating period of 800 nm generated by electron-beam lithography. At a wavelength of 1060 nm, 95% diffraction efficiency is achieved under Littrow conditions. The damage threshold, extremely enhanced compared with conventional gold-coated diffraction gratings, makes these gratings the key elements in high average power (>100 W) femtosecond fiber chirped-pulse amplification systems.
© 2003 Optical Society of America
(050.1950) Diffraction and gratings : Diffraction gratings
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(320.5520) Ultrafast optics : Pulse compression
(320.7090) Ultrafast optics : Ultrafast lasers
Tina Clausnitzer, Jens Limpert, Karsten Zöllner, Holger Zellmer, Hans-Joerg Fuchs, Ernst-Bernhard Kley, Andreas Tünnermann, Marco Jupé, and Detlev Ristau, "Highly Efficient Transmission Gratings in Fused Silica for Chirped-Pulse Amplification Systems," Appl. Opt. 42, 6934-6938 (2003)