Quantum Oscillator and Amplifier Investigations

Izo I. Abram

Nikolai G. Basov, V. S. Zuev, V A Katulin +3 more

Investigations were made of the magnitude and distribution of the population inversion, homogeneity of the medium, and influence of an amplifier on the master-oscillator pulse contrast. It was found that the population inversion distribution was strongly inhomogeneous. The active medium in the amplifier was very homogeneous and ensured a divergence of 10 –4 rad. The iodine amplifier had a negligible (for the contrast) luminescence noise level.

A. M. Perelomov

Olivier Henri‐Rousseau, Paul Blaise

Mark F. Bocko

We have completed our theoretical and experimental investigations of the noise properties of superconducting tunnel junction (SIS) mixers operated as both a phase insensitive linear amplifier and as a phase sensitive linear amplifier. We proposed a technique by which a SIS mixer could be operated as a phase sensitive linear amplifier, i.e., the gain and noise temperature of the amplifier are a function of the phase of the incoming signal. In this technique two phase coherent local oscillators at different frequencies are combined in the mixer simultaneously so both a phase preserving and phase conjugating mixing process occur resulting in a phase sensitive mixer.

Seán Ó Dúill, Ronan F. O'Dowd, G. Eisenstein

In this paper, we present a numerical investigation of the phase shift experienced by the detected envelope of a sinusoidally modulated optical carrier propagating in a nonlinear semiconductor optical amplifier. The model we employed accounts for high-order coherent population oscillations. As such, it allows for large gain levels and arbitrary modulation indexes of the input field. We highlight the role of the fields that are generated by high-order nonlinearities and compare the results with those of more common small-signal nonlinear models. We find that conventional models suffice only for low powers, small modulation indexes, and moderate amplifier gain levels.