DETERMINATION OF TYPE-I PHASE-MATCHING ANGLES AND CONVERSION EFFICIENCY IN KTP

Measurements of the conversion efficiency of second-harmonic generatio n in KTP (KTiOPO4) by the use of type I phase matching for different f undamental wavelengths of a mode-locked picosecond Ti:sapphire laser a re presented. The observed phase matching angles are in agreement with the calculated phase matching curves. At a fundamental wavelength of 834 nm and an intensity of 100 MW/cm(2) the conversion efficiency is 4 % at maximum, and the corresponding effective nonlinear coefficient d( eff) is equal to 0.32 pm/V. The experimental values of d(eff) are rela ted to d(11) (= 0.46 pm/V) of quartz and are in line with the predicti ons.