| 摘要 |
PURPOSE:To obtain a nonlinear optical org. material which has the second harmonic waves generation as large as several times that of urea, is stable at room temp. and is easily growable to a large single crystal by using specific 4-amino-4'-nitrobiphenyl as said org. material. CONSTITUTION:The 4-amino-4'-nitrobiphenyl expressed by the formula I is the single crystal without having a symmetrical center and, therefore, exhibits the second harmonic wave generation (SGH) activity of several times that of urea and is stable at room temp. Said material generates the second harmonic waves (SHG) and generates green light of the wavelength (532mum) of half the wavelength of incident light when measurement is made by projection of Nd: YAG laser (wavelength = 1064mum, output 3mJ/pulse) in the powder state. This material is growable to a single crystal of mm order. The org. crystal which has the large SHG activity, is stable at room temp. and is easily growable to the large single crystal at need is thereby obtd. This crystal is adequate as a material for light wavelength conversion elements, optical shutters, high- speed optical switching elements and optical logical gates as well as the stock for optical transistors, etc. |
