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Change of optimum conditions of second harmonic generation of spatial limited laser beams in nonlinear crystals
Authors:U.K. Sapaev  I.A. Kulagin  T. Usmanov
Affiliation:(1) Academy of Sciences of Uzbekistan, Laser-Matter Interaction Laboratory, NPO Akadempribor, Tashkent, 700125, Uzbekistan;
Abstract:
Frequency doubling of spatially limited laser beams in nonlinear crystals is investigated theoretically. It was shown that the major factor, which reduces the second harmonic generation (SHG) efficiency in this case, is a diaphragm aperture effect, caused by influence of extraordinary polarized laser beams. In that case a spatial shift of mutually orthogonally polarized beams of the incident waves relative to each other in perpendicular direction of wave transmission at the entry to crystals lead to increase the efficiency of SHG of limited beams.
Keywords:KDP crystal  nonlinear crystals  second harmonic generation  spatial limited laser beams  walk-off angle
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