Thermal lens spectroscopy of Nd:YAG

摘要

In this work, the thermal lens (TL) spectrometry was performed as a spectroscopic experiment. The spectrum of heat generated by the Nd~(3+):YAG sample was obtained by continuously tuning a Ti: sapphire laser used as excitation beam. Besides the information about nonradiative efficiency, absolute values of fluorescence quantum efficiency and dsldT were determined through the multiwavelength TL method by using six discrete excitation wavelengths (514, 588, 739, 808, 817, and 869 nm). The pumping and fluorescence quantum efficiencies of Nd~(3+) metastable state (~4F_(3/2)) was observed to be constant throughout the range of excitation wavelengths used. For low doping levels (<0.75 at. % of Nd~(3+)), the effective quantum efficiency is over 93%.