• On the estimation of absolute grating groove density and inter-grating groove density errors of laser pulse compression gratings

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      https://www.ias.ac.in/article/fulltext/sadh/044/03/0059

    • Keywords

       

      Laser pulse compression; diffraction holographic gratings; absolute groove density; inter grating groove density errors.

    • Abstract

       

      In this paper, experimental studies on estimation of absolute groove density of gratings and intergrating 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.

    • Author Affiliations

       

      A K SHARMA1 2 A S JOSHI1

      1. Advanced Lasers and Optics Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India
      2. Homi Bhabha National Institute, Mumbai 400094, India
    • Dates

       

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