Phase and amplitude fluctuations in -DFB lasers due to spontaneous emission

Autor:	F. F. Kamenets, Aleksei A Stratonnikov, D V Batrak, Alexandr P Bogatov, A E Drakin
Rok vydání:	2004
Předmět:	Physics Field (physics) business.industry Physics::Optics Laser Atomic and Molecular Physics and Optics law.invention Laser linewidth Amplitude Optics Orders of magnitude (time) law Optical cavity Spontaneous emission Physics::Atomic Physics business Scalar field
Zdroj:	Journal of Optics A: Pure and Applied Optics. 6:557-563
ISSN:	1741-3567 1464-4258
DOI:	10.1088/1464-4258/6/6/011
Popis:	Fluctuations in the single-frequency operation of an ?-DFB laser due to spontaneous emission are considered theoretically. A semi-classical approach is used, which is based on the scalar wave equation for the field; the complex field distribution inside the cavity and spatial hole burning (SHB) are accounted for. The expressions for the linewidth and the spectral density of the low-frequency power fluctuations are obtained. The dependences of these quantities on the pumping level are calculated using a numerical model of the ?-DFB laser. These dependences show non-trivial behaviour owing to the SHB and the field distribution changing with increasing pumping. The calculations show that the natural linewidth of such a laser may be as low as ?kHz, which is about three orders of magnitude less than typical values for the solitary diode lasers. This is the result of a good spectral and spatial selectivity of the ?-DFB laser cavity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7f4d430c1239af85c8249e361748c8d5 https://doi.org/10.1088/1464-4258/6/6/011 Zobrazit plný text záznamu