Supercritical parametric wave phase conjugation as an instrument for narrowband analysis in ultrasonic harmonic imaging.

Supercritical parametric wave phase conjugation (SWPC) is used for selection and phase conjugation of harmonic components of a nonlinear incident wave. Amplitude of the phase conjugate wave in a supercritical mode is high enough for acoustic nonlinearity of propagation medium to appear. As a result, in particular, doubled and quadrupled frequencies of the incident wave become available for image formation at the same order of the medium nonlinearity.

Projection system with brightness amplifier for biology and medicine.

Some results of investigation of biological systems using laser projection microscope is given. The scheme permitted to work both in reflected and transmitting light. The image of a living cell on a large screen was observed.