The SHG conversion efficiency of 3-(aryl)-pentane-2,4-dione
(L1–L3) was determined by modified version of powder technique
developed by Kurtz and Perry [14]. The compound was ground into
powder and packed between two transparent glass slides. A source
of Nd:YAG laser beam of wavelength 1064 nm was made to fall normally
on the sample cell. The second harmonics signal, generated in
the compound was confirmed from the emission of green radiation
by the crystal. The SHG radiation of 532 nm green light was collected
by a photomultiplier tube (PMT-Philips Photonics-model
8563) after being monochromated (monochromator-model Triax-
550) to collect only the 532 nm radiation The efficiency of the sample
was compared with microcrystalline powder of KDP and urea.
The input energy used in this particular setup was 2.2 mJ/pulse.