Abstract
The theory required for the description of the effect of large beam walk-off angles has been developed and applied to the biaxial molecular crystals (-)2-α-(methylbenzylamino)-5-nitropyridine (MBANP) and 4-(N, N- dimethylamino)-3-acetamidonitrobenzene (DAN). It is shown that for the range of the parameters considered, the large beam-walk angles are not critical in assessing these materials. The dependence of the second-harmonic efficiency on the beam walk-off angles and the crystal length is discussed. Maximum efficiencies of 68 and 82% were calculated for MBANP and DAN, respectively, for the input peak power of 12.6 kW with a beam radius of 0.2 mm.
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