The research on noise in electron devices has two objectives: (i) The study of specific devices, such as the parametric amplifier and the maser, to determine the physical sources of noise and the limitations they impose on the noise performance of the amplifier. The parametric amplifier with coherent input signals at both the signal and idler frequency, and the degenerate parametric amplifier a...

The purpose of this report is to place in proper perspective the role that the modern semiconductor diode lownoise amplifier and converter have in the amplification of extremely small signals. There is a discussion of the fundamental principles of parametric amplification, and a quantitive treatment which is valid in the limit of very high Q diodes. Design formulas from the literature are given...

An ultrafast laser system for the chemically important 3-mm spectral region has been constructed by means of noncritically phased-matched KTiOPO4 optical parametric gain elements. An optical parametric oscillator, synchronously pumped by a mode-locked Ti:sapphire oscillator, generates high-quality seed pulses for an optical parametric amplifier. The optical parametric amplifier, pumped by a hig...

We propose a new scheme for realizing nonlocal nondegenerate optical parametric amplifier by means of genuine four-mode entanglement. The nondegenerate optical parametric amplifier is regarded as a unitary transformation from two input fields to two outputs. Two inputs and two outputs are located at the remote stations respectively. Employing off-line four-mode entanglement, homodyne detection,...