Optical limiting behavior of 4 (2'- hydroxy- naphthyl azo) antipyrine (H-NAP) and its rare-earth complexes

S. Kumari Geetha; C.I. Muneera; K. S. Bindra

doi:10.1117/12.577152

28 January 2005 Optical limiting behavior of 4 (2'- hydroxy- naphthyl azo) antipyrine (H-NAP) and its rare-earth complexes

S. Kumari Geetha, C.I. Muneera, K. S. Bindra

Author Affiliations +

Proceedings Volume 5646, Nonlinear Optical Phenomena and Applications; (2005) https://doi.org/10.1117/12.577152
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

S. Kumari Geetha, C.I. Muneera, and K. S. Bindra "Optical limiting behavior of 4 (2'- hydroxy- naphthyl azo) antipyrine (H-NAP) and its rare-earth complexes", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); https://doi.org/10.1117/12.577152

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