Non-resonant power-efficient directional Nd:YAG ceramic laser using a scattering cavity

KyeoReh Lee (), Ho Jin Ma, Fabian Rotermund, Do Kyung Kim () and YongKeun Park ()
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KyeoReh Lee: Korea Advanced Institute of Science and Technology
Ho Jin Ma: Korea Advanced Institute of Science and Technology
Fabian Rotermund: Korea Advanced Institute of Science and Technology
Do Kyung Kim: Korea Advanced Institute of Science and Technology
YongKeun Park: Korea Advanced Institute of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Non-resonant lasers exhibit the potential for stable and consistent narrowband light sources. Furthermore, non-resonant lasers do not require well-defined optics, and thus has considerably diversified the available types of laser gain materials including powders, films, and turbid ceramics. Despite these intrinsic advantages, the practical applications of non-resonant lasers have been limited so far, mainly because of their low power efficiency and omnidirectional emission. To overcome these limitations, here we propose a light trap design for non-resonant lasers based on a spherical scattering cavity with a small entrance. Using a porous Nd3+:YAG ceramic, directional laser emission could be observed with significant enhancements in the slope efficiency and linewidth (down to 32 pm). A theoretical model is also developed to describe and predict the operation characteristics of proposed non-resonant laser.

Date: 2021
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DOI: 10.1038/s41467-020-20114-2

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