Second harmonic generation and sum frequency mixing of dual wavelength Nd:YALO3 laser in flux grown KTiOPO4 crystal

On the basis of accurately measured refractive indexes, the authors have obtained the Sellmeier's equations for flux grown KTiOPO4 (KTP) crystal and used them to calculate the phase matched angles (theta sub m, phi sub m) and effective nonlinear coefficients (d sub eff) for type I and III second harmonic generation (SHG) and sum frequency mixing (SFM) of radiations at 1.0795 and 1.3414 microns. The optimum phase matching conditions for 1.0795 and 1.3414 microns SHG are that theta sub m = 86.88 and 58.88 deg, respectively, in an XZ plane (phi = 0) and for SMF of 1.0795 and 1.3414 microns in the same plane 76.02 deg. The corresponding d sub eff values calculated from theta sub m's are 18.07 x 10 exp -9 and 17.42 x 10 exp -9 esu.