Non-linear optics, Tetragonal

• H-K-O-P
• Ag-Ga-S
• Ag-Ga-Se
• K-Li-Nb-O
• C-Cd-N-S-Zn
• non-linear optical properties
• second-harmonic generation
• chalcogen
• nonmetal
• transitional
• non-disordered
• quaternary