A new approach for measurement of Cr4+ concentration in Cr4+:YAG transparent materials: some conceptual difficulties and possible solutions

TL;DR

This paper analyzes the challenges in accurately measuring Cr4+ concentration in Cr:YAG materials using absorption spectroscopy and proposes a new optical spectroscopy approach to improve estimation accuracy.

Contribution

The paper introduces a novel optical spectroscopy method to estimate Cr4+ concentration, addressing uncertainties in traditional absorption spectrum deconvolution and oscillator strength values.

Findings

Identifies conceptual difficulties in current measurement methods

Proposes a new approach based on survey absorption spectra

Highlights potential for improved accuracy in Cr4+ concentration estimation

Abstract

In the present work we provide an analysis of the accuracy of the calculation of Cr4+ concentration in Cr4+:YAG using absorption spectroscopy. We propose a new approach based on the convenient optical spectroscopy to estimate the Cr4+ concentration in Cr:YAG using survey absorption spectra. The Smakula Dexter formula is usually used for this purpose. However, the uncertainties in the values of oscillator strengths for Cr4+ absorption bands and, moreover, in the deconvolution of Cr4+ absorption spectra make it difficult to calculate the Cr4+ concentrations with high accuracy.