Tailoring second-harmonic generation in KTP via femtosecond laser microstructuring
Potassium titanyl phosphate (KTP) is a widely used nonlinear optical crystal due to its large second-order susceptibility and broad transparency range. However, second-harmonic generation (SHG) at Ti:Sapphire laser wavelengths (~800 nm) cannot be achieved through birefringent phase matching, typically requiring quasi-p...