Abstract
Optical second harmonic generation (SHG) has been investigated in single-crystals of urea and ammonium-malate (AM). Phase match angle, refractive indices, and all nonvanishing coefficients of the nonlinear susceptibility tensor have been measured. A comparison to KDP shows, that AM is comparable to KDP, urea much more efficient in SHG than KDP, The measurements were performed with a flash-lamp pumped dye laser which could be tuned from 480 nm to 640 nm using different dyes (mainly coumarins and rhodamines). The crystals were gro-wn from solution and had a typical size of 5 x 10 x 10 mm3 in the case of urea and 15 x 15 x 10 mm3 in the case of AM, respectively, after cutting and polishing. They could be rotated in the laser beam around a horizontal and a vertical axis, so that all desired crystal directions for the incident polarization could be achieved. For the detection of the second harmonic signal served a solarblind photomultiplier with CST.e photocathode, the signal of which could either be displayed on an oscilloscope or be averaged by a gated integrator.
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