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Intracavity Multi‐Photon‐Absorption and the Quantum Noise Spectrum of Light
Author(s) -
Herzog Ulrike
Publication year - 1991
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19915030811
Subject(s) - physics , shot noise , quantum noise , photon , relative intensity noise , optics , noise (video) , resonator , noise spectral density , absorption (acoustics) , noise reduction , atomic physics , optoelectronics , quantum , noise figure , laser , quantum mechanics , acoustics , semiconductor laser theory , amplifier , cmos , artificial intelligence , detector , computer science , image (mathematics)
The intensity noise spectrum is investigated quantum‐mechanically for incident coherent light passing through a resonator which is filled with a k ‐photon‐absorber. For k ⩽ 2 the noise of the outgoing light is reduced below the shot noise level the reduction being maximal for frequencies that are small in comparison to the cavity bandwidth. It turns out that the highest possible value of this low‐frequency noise reduction is obtained when the resonator losses due to transmission through the outcoupling mirror are 2 k – 1 times as large as the k ‐photon absorption losses. In this case the noise at zero frequency is reduced with respect to the shot noise level by a factor of k /(2 k – 1).