Share Email Print
cover

Proceedings Paper

Optical limiting behavior of 4 (2'- hydroxy- naphthyl azo) antipyrine (H-NAP) and its rare-earth complexes
Author(s): S. Kumari Geetha; C.I. Muneera; K. S. Bindra
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We report the optical limiting performances of a newly synthesized chromophore, 4 (2'-hydroxy- naphthyl azo ) antipyrine ( H-NAP ) and it's rare earth perchlorate complexes, La ( NAP )2 ClO4 and Dy ( NAP)2 ClO4, in solution for 20ns pulses of wavelength 532nm. Comparing with the limiting response of C60 in toluene (already reported optical limiter), the limiting threshold of H-NAP and it's complexes were found to be much lower. The origin of the optical limiting behavior observed for the samples are under investigation. To elucidate the various phenomena involved, z-scan experiments were performed in all the samples. From the closed aperture data, a negative refractive non-linearity (de-focusing effect) can be inferred in all the three cases. Larger magnitude of n2 is expected to result in a more effective optical limiting, which implies a lower threshold for limiting and correspondingly lower output above threshold. The second hyperpolarizability of the compounds has a negative sign and is much larger than the reported values for fullerenes. The limiting in H-NAP can be attributed to the large nonlinear absorption of the material and in La (NAP)2ClO4 and Dy (NAP)2 ClO4, the main mechanism may be de-focusing caused by the nonlinear refractive index. H-NAP and its rare earth perchlorate complexes can hence be considered as very promising materials for optical power limiting.

Paper Details

Date Published: 28 January 2005
PDF: 7 pages
Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.577152
Show Author Affiliations
S. Kumari Geetha, Christian College (India)
C.I. Muneera, Univ. of Kerala (India)
K. S. Bindra, Ctr. for Advanced Technology (India)


Published in SPIE Proceedings Vol. 5646:
Nonlinear Optical Phenomena and Applications
Qihuang Gong; Yiping Cui; Roger A. Lessard, Editor(s)

© SPIE. Terms of Use
Back to Top