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Optical theorem helps understand thresholds of lasing in microcavities with active regions
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SYSNO ASEP 0437137 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Optical theorem helps understand thresholds of lasing in microcavities with active regions Author(s) Smotrova, E. I. (UA)
Byelobrov, V. (UA)
Benson, T. M. (GB)
Čtyroký, Jiří (URE-Y) RID
Sauleau, R. (FR)
Nosich, A. I. (UA)Number of authors 6 Source Title IEEE Journal of Quantum Electronics - ISSN 0018-9197
Roč. 47, č. 1 (2011), s. 20-30Number of pages 11 s. Publication form Print - P Language eng - English Country US - United States Keywords Eigenvalue problem ; lasing threshold ; microcavity laser Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering CEZ AV0Z20670512 - URE-Y (2005-2011) UT WOS 000283938500001 EID SCOPUS 78149245297 DOI https://doi.org/10.1109/JQE.2010.2055836 Annotation Within the framework of the recently proposed approach to view the lasing in open microcavities as a linear eigenproblem for the Maxwell equations with exact boundary and radiation conditions, we study the correspondence between the modal thresholds and field overlap coefficients. Macroscopic gain is introduced into the cavity material within the active region via the active imaginary part of the refractive index. Each eigenvalue is constituted of two positive numbers, namely, the lasing wavenumber and the threshold value of material gain. This approach yields clear insight into the lasing thresholds of individual modes. The Optical Theorem, if applied to the lasing-mode field, puts the familiar "gain=loss" condition on firm footing. It rigorously quantifies the role of the spatial overlap of the mode E-field with the active region, whose shape and location are efficient tools of the threshold manipulation. Here, the effective mode volume in open resonator is introduced from first principles. Examples are given for the 1-D cavities equipped with active layers and distributed Bragg reflectors and 2-D cavities with active disks and annular Bragg reflectors Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2015
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