ACOUSTOOPTICAL SEMICONDUCTOR DEFLECTOR AND DEVICE BUILT AROUND IT FOR CONTROLLING DIRECTION OF RADIATION, WAVELENGTH, AND POWER (ALTERNATIVES) Russian patent published in 2004 - IPC

FIELD: acoustooptics; controlling laser beams, their wavelength, and power, such as video data displays, laser microscopes, and systems for treatment of materials including biological ones.

SUBSTANCE: proposed deflector has acoustic-and-optical conductor made of tellurium dioxide crystal (TeO₂) in the form of hexahedron whose opposing first and second faces mount hexahedron-shaped lithium niobate (LiNbO₃) piezoelectric converter and acoustic absorber; electrodes; and case with current conductors connected to high-frequency signal generators or to variable-frequency high-frequency signal generator. Piezoelectric converter is connected to first face of crystal through common electrode. At least two electrodes disposed on outer side face of piezoelectric converter are connected to isolated current conductors. Input face of crystal is inclined to incident beam axis so that perpendicular to its surface and beam axis form angle ϕ. First face of crystal forms angle β1 with its input face and angle β2, with its output face; it is tilted through angle β3 to crystal axis 001; mentioned angles are chosen within following ranges: 9.3⁰ ≤ ϕ ≤ 10.5⁰; 95.5⁰ ≤ β1 ≤ 96.5⁰; 85⁰ ≤ β2 ≤ 93.5⁰; 5.5⁰ ≤ β3 ≤ 7⁰. Outer side face of piezoelectric converter is inclined toward input face so that size of piezoelectric converter edges h and H at input and output faces of crystal, respectively, are chosen within following ranges: 15 μm ≤ h ≤ 18 μm; 32 μm ≤ H ≤ 36 μm; electrodes are elongated toward perpendicular beam axis and their width along the latter is such that piezoelectric converter height under electrode varies within 3 - 5 μm; electrode distance is chosen so as to ensure that piezoelectric converter height under two adjacent electrodes is twice as different. X-Y radiation converter has two acoustooptical deflectors mounted in tandem, second deflector being turned through 90⁰ relative to first deflector about beam axis.

EFFECT: enhanced effectiveness of acoustooptical interaction during expansion of deflector operating frequency band; simplified design.

12 cl, 3 dwg