کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1860843 | 1037461 | 2011 | 5 صفحه PDF | دانلود رایگان |
The mathematical notion of a spectral singularity admits a physical interpretation as a zero-width resonance. It finds an optical realization as a certain type of lasing effect that occurs at the threshold gain. We explore spectral singularities of a complex spherical barrier potential and study their realization as transverse spherical electromagnetic waves emitted by a gain medium with a spherical geometry. In particular, for a typical dye laser material, we obtain a lower bound on the size of the gain medium for the occurrence of this kind of spectral singularities.
► This Letter studies the spectral singularities of a spherical complex barrier potential.
► These are shown to admit a realization as a special type of spherical laser.
► A reliable perturbative analysis is performed to obtain analytical results that elucidate physical aspects of the problem.
► Numerical values of the physical parameters of the system have been obtained for a concrete spherical dye laser.
Journal: Physics Letters A - Volume 375, Issue 39, 12 September 2011, Pages 3387–3391