On the estimation of absolute grating groove density and inter-grating groove density errors of laser pulse compression gratings
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In this paper, experimental studies on estimation of absolute groove density of gratings and inter-grating groove density errors are reported with typical detector limited accuracies of ±0.23 lines mm−1 and ±0.005 lines mm−1, respectively at groove density of ~1740 lines mm−1 of holographic laser pulse compression gratings. A simple single detector based optical set-up with fixed optical elements to avoid mechanical eccentric errors, if any, due to goniometric movement of a rotatory stage, has been proposed to estimate absolute groove density of gratings. A modified Fizeau or a modified Michelson interferometer based optical set-up has been used to estimate inter-grating groove density errors of gratings. Various gratings from different manufacturers were examined for their absolute groove densities and inter-grating groove density errors.
KeywordsLaser pulse compression diffraction holographic gratings absolute groove density inter grating groove density errors
AKS thanks Shri D Daiya and Ms J Sharma from High Energy Laser Development Laboratory, Advanced Lasers and Optics Division of RRCAT, Indore for their participation in initial experiment on estimating inter-grating groove density errors.
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