Asgari A.,Amirkabir University of Technology |
Kazaz H.A.,Amirkabir University of Technology |
Maleki M.H.,Optic and Laser Research School |
Shabestari N.P.,Optic and Laser Research School |
And 2 more authors.
Optical Engineering | Year: 2012
A few holographic metallic (gold and silver) gratings with maximum diffraction efficiency (DE) in the 700 to 1100 nm wavelength range were designed. These designed diffraction gratings can be attractive for stretching and compressing pulses in chirped pulse amplification (CPA) technology. They were optimized for transverse magnetic polarized light in the first order (littrow mount). KPP1206 photoresist was used to model the final pattern on photoresist thin film. To obtain super Gaussian profiles, approximately identical exposure energy density intervals were used for optimizing grating profile. The optimized gold and silver gratings were compared in terms of DE, bandwidth and incidence angle range. Dependence of DE on the depth and duty cycle of super Gaussian gold and silver gratings showed that the silver grating had higher DE than the gold grating in 1064 nm. Fabricated silver grating based on modeling results had good agreement with experimental results. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).