We present an improved version of the classical heterodyne interferometer for ultrasound
detection, which includes a double phase conjugate mirror (DPCM) in the detection arm …

The geometry of a total-internal-reflection (TIR) phase-conjugate mirror is investigated in the
framework of a two-dimensional model, based on the solution of nonlinear material …

We present numerical simulations of the complex grating structure that is generated when
several longitudinal modes from a laser induce a self-pumped phase conjugator in a …

We present and describe different techniques based on the photorefractive effect that are
used for the optical detection of ultrasonic signals. These techniques use the wavefront …

We develop a theoretical model that shows that the overlap integral of two
counterpropagating waves is an invariant along propagation in a reciprocal optical system …

Frequency shifts and dynamic instabilities in photorefractive cat self-pumped phase
conjugators and bridge mutually pumped phase conjugators are studied by use of a two …

An amplitude equation is derived for a four-wave-mixing geometry with nearly
counterpropagating, mutually incoherent, nondiffracting pump beams, spatially overlapping …

The question whether double phase conjugator is an oscillator or an amplifier is addressed
by a careful numerical investigation of the operation of the device in the regime of …

The self-organized representation of images by photorefractive oscillator modes is studied
experimentally and theoretically. Two types of representations are demonstrated: a feature …

A novel configuration for a self-pumped phase conjugator has either only one internal loop,
or beam path, which curves into one corner or two loops of similar form or two loops of quite …