Masaharu Nakayama

Influence of the Ring-Substitution on the Second Harmonic Generation of Chalcone Derivatives

Several chalcone derivatives exhibiting second harmonic generation up to 5 times that of urea under IR-excitation have been synthesized by varying the substituents on both phenyl-rings.

Laser properties of new organic nonlinear optical crystals chalcone derivatives

A large single crystal (18×40×15 mm3) of a new nonlinear optical material ‘‘chalcone derivative’’ has been grown by an evaporation method. This crystal was relatively easy to grow to a large size and was chemically stable. The cutoff wavelength was 430 nm. The calculated phase matching angles for the second‐harmonic generation (SHG) of Nd:YAG lasers agreed with the experimental data. Effective nonlinear optical coefficients deff of type I and type II for SHG have been measured to be 3.5 pm/V for type I and 5.7 pm/V for type II.

Second‐harmonic generation of a new chalcone‐type crystal

A new type of chalcone crystal was prepared. Anisotropic indices with wavelength dispersion were measured by the Brewster angle method. The two largest second‐harmonic generation (SHG) tensor components were determined by the wedge method and compared with d11 of 2‐methyl‐4‐nitroaniline. Calculated collinear and noncollinear phase‐matched SHG patterns reasonably fit the observed photographs.