Designing a Broadband Pump for High-Quality Micro-Lasers via Modified Net Radiation Method
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Designing a broadband.pdf
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Author(s)
Nechayev, Sergey
Rotschild, Carmel
Reusswig, Philip David
Baldo, Marc A
Date Issued
December 2016
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Nechayev, Sergey et al. “Designing a Broadband Pump for High-Quality Micro-Lasers via Modified Net Radiation Method.” Scientific Reports 6.1 (2016): n. pag.
Version
Final published version
Abstract
High-quality micro-lasers are key ingredients in non-linear optics, communication, sensing and low-threshold solar-pumped lasers. However, such micro-lasers exhibit negligible absorption of free-space broadband pump light. Recently, this limitation was lifted by cascade energy transfer, in which the absorption and quality factor are modulated with wavelength, enabling non-resonant pumping of high-quality micro-lasers and solar-pumped laser to operate at record low solar concentration. Here, we present a generic theoretical framework for modeling the absorption, emission and energy transfer of incoherent radiation between cascade sensitizer and laser gain media. Our model is based on linear equations of the modified net radiation method and is therefore robust, fast converging and has low complexity. We apply this formalism to compute the optimal parameters of low-threshold solar-pumped lasers. It is revealed that the interplay between the absorption and self-absorption of such lasers defines the optimal pump absorption below the maximal value, which is in contrast to conventional lasers for which full pump absorption is desired. Numerical results are compared to experimental data on a sensitized Nd[superscript 3+]:YAG cavity, and quantitative agreement with theoretical models is found. Our work modularizes the gain and sensitizing components and paves the way for the optimal design of broadband-pumped high-quality micro-lasers and efficient solar-pumped lasers.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/srep38576
