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Georgian Scientists

Vol. 7 Issue 4,  2025

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Acquisition of hard-to-detect objects in airspace, utilizing modulated laser
radiation for perimeter control.

Shalva Kakabadze, Tengiz Khachidze, Guram Chaganava, Inga Kapanadze, Nikoloz
Khachidze

LEPL Institute "Optica"
Abstract
The paper presents studies designed to create a detector device for objects that are difficult
to detect in airspace by radar. The principle of operation of the device is based on the use
of modulated laser radiation. In particular, a 10 W laser with a wavelength of 980 (+/-5) nm
was used in the studies. The studies were mainly devoted to the extent to which the quality
of the received signal depends on the pulse filling capacity of the transverse pulse control
signal in laser modulation. The experiment was conducted for transverse pulses of the
modulator with a filling capacity of 90% to 10%. Both the modulated signal and the signal
reflected from the object were recorded with an oscilloscope.
The  studies  showed  that  the  quality  of  the  signal  reflected  from  the  object  does  not
deteriorate with a decrease in filling capacity and it is quite good even in the case of a filling
capacity of 10%. This fact was also confirmed when recording the signal reflected from the
object with a headset. This leads to the conclusion that reducing the pulse fill factor to 10-
15% by using a transverse pulse control signal in the modulation will allow us to increase
the factory-allowed power of the laser by 2-3 times, and it will be possible to receive signals
from quite large distances (hundreds of meters) and, accordingly, detect objects.

Keywords: laser, modulation, signal.