Optimizing grain size distribution in Nd:YVO4 powder pellets for random laser action with high efficiency

Niklaus U. Wetter; E. Jimenez-Villar; Julia M. Giehl; Felix Butzbach; Victor Tayra

doi:10.1117/12.2256600

17 February 2017 Optimizing grain size distribution in Nd:YVO₄ powder pellets for random laser action with high efficiency

Niklaus U. Wetter, E. Jimenez-Villar, Julia M. Giehl, Felix Butzbach, Victor Tayra

Author Affiliations +

Proceedings Volume 10082, Solid State Lasers XXVI: Technology and Devices; 1008216 (2017) https://doi.org/10.1117/12.2256600
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

We demonstrate a volumetric random laser with an optical efficiency of 15%. We use a 1.33 mol% Nd:YVO₄ crystal, grind it and mix the particles into ten different size distributions with mean particle sizes ranging from approximately 10 micrometers to 100 micrometers. After pressing into pellets, each of the ten groups has its transport mean free path calculated from the distribution spectra and experimentally measured by means of its backscattering cone. We then calculate the fill fractions of each sample. The pellets are diode-pumped at 806.5 nm. Linewidth narrowing and output power are measured as a function of absorbed pump power. We demonstrate that the smaller particles, trapped between large particles, serve as gain centers whereas the large particles control the light diffusion into the sample. By optimizing diffusion and gain we achieve high slope efficiency.

Conference Presentation

Citation Download Citation

Niklaus U. Wetter, E. Jimenez-Villar, Julia M. Giehl, Felix Butzbach, and Victor Tayra "Optimizing grain size distribution in Nd:YVO₄ powder pellets for random laser action with high efficiency", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 1008216 (17 February 2017); https://doi.org/10.1117/12.2256600

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