Laser threshold of Mie resonances

K.L. van der Molen, P. Zijlstra, Peter Zijlstra, Aart Lagendijk, Allard Mosk

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We show that time-independent scattering coefficients calculated from the standard extrapolation of Mie theory to the gain regime have physical meaning up to the laser threshold. The theoretical width of a resonance decreases linearly with increasing gain and becomes zero at the laser threshold. We performed experiments on dielectric microspheres with gain, trapped with optical tweezers. The width of the mode was measured to narrow as a function of the gain up to the lasing threshold, confirming both the validity of the extrapolation of Mie theory to the gain regime below threshold and our interpretation of its point of divergence as the laser threshold.
Original languageUndefined
Pages (from-to)1432-1434
Number of pages3
JournalOptics letters
Issue number10
Publication statusPublished - 2006


  • METIS-233412
  • IR-71718

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