High–Precision light rangefinder with phase modulation accumulation

Abstract The paper suggests the possibility of reducing the modulation power by using a light modulator on a KDP crystal of a special design. For this purpose, in the light modulator, the second end of the electro–optical crystal and the clamping contact at the junction are made in the form of two orthogonal planes, the intersection line of which is parallel to one of the induced axes of the crystal. The orthogonal planes of the electro–optical crystal are made reflective. In such a crystal, the incoming beam is reflected twice without changing the modulation polarization and exits the crystal with an accumulation of modulation, leading to a decrease in microwave power and an increase in the signal–to–noise ratio by eliminating internal reflections of the crystal on the photo detector.