Abstract
The question of 'what is a laser' is closely related to that of what is laser threshold. We analyze possible definitions of laser threshold through the L-I curve and conclude that there is no consistent definition of a threshold when the spontaneous emission factor is large, as in the case of micro-and nano-lasers. All these definitions based on L-I curve are not consistent with the evolution of statistical properties of light output with pumping. Thus, we argue that the threshold definition based on L-I curve has to be abandoned for nanolasers, where the fraction of spontaneous emission into a lasing mode becomes quite large.
Original language | English (US) |
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Article number | 6516933 |
Journal | IEEE Journal on Selected Topics in Quantum Electronics |
Volume | 19 |
Issue number | 4 |
DOIs | |
State | Published - 2013 |
Keywords
- Correlation functions
- laser threshold
- nanolasers
- spontaneous emission factor
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering