• Cavity ring-down technique for measurement of reflectivity of high reflectivity mirrors with high accuracy

• # Fulltext

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 ($R$ &gt; 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

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

• # Pramana – Journal of Physics

Current Issue
Volume 93 | Issue 6
December 2019

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019