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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/075/06/1233-1239

    • Keywords

       

      Cavity ring-down method; reflectivity measurement; optical resonator.

    • Abstract

       

      A simple, accurate and reliable method for measuring the reflectivity of laser-grade mirrors ($R$ > 99.5%) based on cavity ring-down (CRD) technique has been success-fully demonstrated in our laboratory using a pulsed Nd:YAG laser. A fast photomultiplier tube with an oscilloscope was used to detect and analyse the CRD signal. The cavity decay times were measured for three cavities formed by a combination of three mirror pairs. The absolute reflectivities $R_{1}$, $R_{2}$, $R_{3}$ were determined to be 99.94%, 99.63%, 99.52% at normal incidence. The reflectivity of mirrors is measured to an accuracy of 0.01%.

    • Author Affiliations

       

      G Sridhar1 Sandeep K Agarwalla1 Sunita Singh1 L M Gantayet1

      1. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

       
  • Pramana – Journal of Physics | News

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