Angle tuning characteristics of second-harmonic generation in KTiOPO4

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Abstract
The angle tuning characteristics of second‐harmonic generation in KTP were experimentally demonstrated using stimulated Raman light in a single‐mode fiber as a fundamental light source. The type II phase‐matching condition for second‐harmonic generation in the y‐z plane can be satisfied over the range 1.06 –1.85 μm by varying the incident angle in the θ direction by 29°. The acceptance angles in the θ direction for type I and type II interactions were also measured. These experimental results agreed well with the theoretical values. It is also found that the effective nonlinear coefficient for type I interaction obtained experimentally is larger than the calculated value from nonlinear coefficients of the crystal.