Gain and noise characteristics of a Brillouin amplifier and their dependence on the spatial structure of the pump beam

Autor:	P. R. Tapster, D. E. Watkins, Andrew M. Scott
Rok vydání:	1990
Předmět:	Physics Optical amplifier business.industry Amplifier Physics::Optics Statistical and Nonlinear Physics Noise (electronics) Atomic and Molecular Physics and Optics Signal-to-noise ratio Optics Brillouin scattering M squared Laser beam quality business Beam (structure)
Zdroj:	Journal of the Optical Society of America B. 7:929
ISSN:	1520-8540 0740-3224
DOI:	10.1364/josab.7.000929
Popis:	Amplification of a weak input signal (~0.5 pJ) in a high-gain (G = 109) Brillouin amplifier has resulted in an output signal-to-noise ratio of 85:1, within a factor of 4 of the theoretical estimate. For a near-diffraction-limited Gaussian pump beam this noise increases exponentially with pump intensity with the same gain coefficient as for an input signal. When the pump beam is aberrated, the effective gain coefficient for the conjugate is enhanced by as much as a factor of 3, depending on the nature of the aberration. The enhancement factor J is found to vary significantly when the laser beam passes through different regions of the aberrator.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a6ef72af67e82ccb3e9ea9dc22f9b2c4 https://doi.org/10.1364/josab.7.000929 Zobrazit plný text záznamu