Second harmonic generation in binary systems of pi-conjugated compounds
Abstract
A large Second Harmonic Generation (SHG) intensity which was 60 times as large as that of urea was observed in p-nitroaniline (PNA) I N-(p--nitrophenyl)ethylenediamine (NPEN) system. Results of X-ray and Scanning Electron Microscopy (SEM) analysis showed the new crystal structure. And this SHG intensity was related to cooling rate for solidification. The optimum cooling rate was in the range of 2°C/sec to 10°C/sec. Moreover, results of X-ray analysis and SHG measurements of similar binary systems showed that hydrogen bond and unique non- planar structure of NPEN played an important role for SHG and its stability.
- Publication:
-
Nonlinear Optical Properties of Organic Materials III
- Pub Date:
- December 1990
- DOI:
- 10.1117/12.22958
- Bibcode:
- 1990SPIE.1337..314W