ACOUSTO-OPTICAL DEVICE FOR FREQUENCY-PHASE FORMATION OF CONICAL DOUBLE ANNULAR FIELDS FOR DARK OPTICAL TRAPS Russian patent published in 2024 - IPC G02F1/11 

FIELD: physics.

SUBSTANCE: invention can be used for formation of laser conical double annular fields. Essence of the invention consists in the fact that the device for forming the laser conical double annular fields consists of successively arranged on the common optical axis of the telescope, a Fourier lens, a non-collinear acousto-optical filter of spatial frequencies and a polariser, as well as first and second electrical matching circuits, two-channel control unit with programmable phase difference δ between output high-frequency signals. Said acousto-optic filter comprises a birefringent acousto-optic crystal, an input optical facet, a lateral acoustic facet, an output optical facet, first and second shift piezoelectric transducers made from a lithium niobate crystal and connected to the acoustic face in series along the optical axis of the device. Transmission axis of the polariser is orthogonal to the optical axis of the device and is parallel to the polarization of the first order of diffraction in the acousto-optical filter, output of the first channel of the control unit is connected to the first piezoelectric transducer of the acousto-optical filter through the first matching circuit, the output of the second channel of the control unit is connected to the second piezoelectric transducer of the acousto-optical filter through the second matching circuit.

EFFECT: enabling three-dimensional electronic control of radii and angle at the vertex of a single-frequency laser field which forms a conical capture zone with speed of up to 100 kHz.

6 cl, 2 dwg, 1 tbl