| Autor: |
Pnina Shaier, Zvi Kotler, Baruch Zinger, Asa Fein |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
SPIE Proceedings. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.187536 |
| Popis: |
An important potential application of organic materials for nonlinear optics lies in the field of optical switching and power limiting. One advantage of using polymeric suspensions is that one can chemically control the position of the absorption peaks thereby changing nonlinear properties associated with absorption. In this work we report on the nonlinear transmission characteristics of Poly(isothianaphtene) suspended in various solvents. The polymers were synthesized from Dichloro-o-xylene and polymerized with the use of several oxidizing agents. Submicronic particles were obtained by crushing and straining the polymers. We investigated the nonlinear transmission threshold its dependence on the oxidizing agents and the solvents and the mechanisms leading to the nonlinearity. Measurements were carried out at 1064 nm. In some cases nonlinear transmission thresholds were found to be comparable to that of carbon black suspensions. The absorption per particle was found to be important in determining the nonlinearity threshold. The mechanism responsible for the nonlinearity was identified as thermal in nature and is characterized by scattering, plasma formation, self action of the medium and increased absorption due to particle break up. This mechanism is close to that found in carbon-black suspensions but with some important differences that will be discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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