ADAPTIVE APERTURE PROBING SYSTEM FOR WAVEFRONT DISTORTION COMPENSATION IN LASER SYSTEMS Russian patent published in 2023 - IPC G02B26/08 

FIELD: optical instrument making.

SUBSTANCE: used in laser systems for location, power delivery to spacecraft, lidars and other laser systems for various purposes with adaptive phase front control by aperture sensing. The adaptive optical system (AOS) for aperture sensing between the photodetector unit (PU) and the signal processing and active mirror control unit (PCU) additionally includes a selective amplifier unit that extracts the modulated signal against the background of slowly changing illumination, and a detector unit with a low-pass filter, which selects the signal component proportional to the intensity of the backscattered radiation of the probing beam from the focus region. Maximizing the signal from the photodetector is the target function of the AOS. The selective amplifier increases the signal-to-noise ratio, since it selects only the frequency of the first harmonic of the pulsed signal, excluding slowly changing background illumination and all the noise of the pulsed amplifier of the photodetector unit outside the amplifier passband.

EFFECT: improving the quality of compensation for wavefront aberrations of the main laser beam.

2 cl, 2 dwg