Title :
Considerations of noise and schemes for its reduction in laser amplifiers
Author :
Kogelnik, H. ; Yariv, A.
Author_Institution :
Bell Telephone Laboratories, Inc., Murray Hill, NJ
Abstract :
Spontaneous emission adds noise to the signal in laser amplifiers. In this paper the radiation characteristics of this noise and structures to reduce it are discussed. The structures make use of the spatial directionality of coherent light, and consist of aperture stops in combination with lenses. Their ultimate performance is studied. Signal-beam configurations necessary for optimum signal-to-noise (SNR) are described.
Keywords :
Apertures; Laser modes; Laser noise; Lenses; Masers; Noise reduction; Optical amplifiers; Optical noise; Signal to noise ratio; Stimulated emission;
Journal_Title :
Proceedings of the IEEE
DOI :
10.1109/PROC.1964.2805
