SCANNING LASER Russian patent published in 1997 - IPC

FIELD: laser location, communication, transmission and storage of information, laser technological installations for high-accuracy working of materials. SUBSTANCE: proposed scanning laser incorporates active element housed in resonator with two mirrors, spatial-time light modulator manufactured in the form of intraresonator electrically controlled plate with linear controlling electrodes placed near second mirror of resonator and pumping source. Novelty of scanning laser consists in insertion of total polarizer fabricated in the form of polarization divider located between plate of spatial- time light modulator and active element, nonlinear crystal, third total reflection mirror forming confocal resonator with first mirror, two quarter- wavelength plates positioned on both sides of polarizer mounted in radiation path of reflected component, slit diaphragm arranged between spatial time light modulator and quarter-wavelength plate. In the capacity of active element of confocal resonator there is selected medium with several lengths of generation waves, thickness of quarter-wavelength plates is chosen on certain condition, linear controlling electrodes of plate of spatial-time light modulator are placed at angle of 45 deg with respect to transmission plane of polarizer, nonlinear crystal is capable of synchronism for o-o-e interaction of generations of second harmonics and summary frequencies of key radiation. Axis Z of crystal is located at angle θ to axis of resonator and synchronism angles of nonlinear interactions for key radiation with λ₁, λ₂,...λ_n lie within range θ ± 0,5β, where β is angle between extreme positions of central directions of propagation of scanning rays inside nonlinear crystal. EFFECT: expanded application field, enhanced functional stability and reliability. 1 dwg