IDENTIFICATION OF TUMOR TISSUES BY AUTODYNE METHOD

The results of study of laser evaporation of models of healthy and tumoral biological tissues by autodyne method are presented. It is shown the level of autodyne signal varies in different degrees depending on the type of healthy and tumoral biotissues at its laser evaporation.

Limiting capabilities of self-mixing interferometry upon sawtooth modulation of a semiconductor laser wavelength

This paper discusses a self-mixing interferometry method for measuring distances upon sawtooth modulation of the wavelength of laser radiation. Conditions under which the distance obtained from the spectrum of the modeled autodyne signal coincides with the distance specified in computer simulation are determined. The limiting capabilities of the method are theoretically substantiated for the increased range of deviations of the laser wavelength. The estimation of the limiting capabilities of the distance measurement method on the spectrum of the autodyne signal gives 10 microns at a wavelength of 650 nm at a 5-nm deviation of laser radiation wavelength. We also discuss difficulties of attaining the limiting accuracy of distance measurements associated with the nonlinear dependence of the wavelength emitted by a laser diode on its supply current and the need to analyze the self-mixing signal at high frequencies.

Autodyne signal features of frequency-locked microwave oscillators

The research results on the autodyne signal formation in microwave oscillators, which are exposed under the impact of the proper reflected emission and, at the same time, of the external frequency-locked signal are presented. The basic relations are obtained for signal analysis under the condition of the quasistatic target movements. The theoretical research results are confirmed by experimental data obtained on the example of an oscillator made on the basis of the 8mm-range Gunn diode.