- All Journals
- Al-Qadisiyah University
- Basrah University
- Kirkuk University
- Mosul University
- The Iraqi Borad for Medical Specialization
- University of Anbar
- University of Technology
- Al Mustafa University
- Al-Zahraa University for Women
- Alnoor University
- Kunooz University
- Misan University
- Ninevah University
- Tikrit University
- University of Al-Hamdaniya
- University of Kerbala
FOCUSING, DEFOCUSING AND OPTICAL LIMITING IN DODCI DOPED FILMS IN PMMA BY USING Z-SCAN TECHNIQUE | ||
| AL-TAQANI | ||
| Article 1, Volume 24, Issue 6, 2011, Pages 33-42 | ||
| Author | ||
| Amal F. Jaffar | ||
| Abstract | ||
| During this work a simplified and sensitive experimental technique named Z-scan (closed aperture) have been used, to study the optical nonlinearity and optical limiting of the organic dye DODCI doped with the polymer polymethylmethacrylate (PMMA) in the solvents Chloroform and THF with various concentrations (10-5 -10-3)M/L for dye doped polymer films. Samples were prepared by free casting method. The results show that the investigated organic dye molecule exhibits negative refractive index (defocusing) and positive refractive index (focusing) as well as the behavior switch over from negative two positive refractive index for the film of concentration 10-3 M/L (as the thickness is increased). With closed aperture Z-scan the nonlinearity changed with changing the phase shift in the samples owing to the contribution of thermal effect .The measurements indicates that the nonlinear refractive index increased linearly with the nonlinear phase shift. The results of this work shown too that only the doped film of DODCI in THF can be an optical limiter. The results show that the investigated organic dye molecule exhibits negative refractive index (defocusing) and positive refractive index (focusing) as well as the behavior switch over from negative two positive refractive index for the film of concentration 10-3 M/L (as the thickness is increased). With closed aperture Z-scan the nonlinearity changed with changing the phase shift in the samples owing to the contribution of thermal effect .The measurements indicates that the nonlinear refractive index increased linearly with the nonlinear phase shift. The results of this work shown too that only the doped film of DODCI in THF can be an optical limiter. Keywords: DODCI Doped Films, Z-scan technique, nonlinear refractive index, nonlinear absorption coefficient, optical limiting. | ||
| Keywords | ||
| DODCI Doped Films; scan technique; nonlinear refractive index; nonlinear absorption coefficient; optical limitin | ||
|
Statistics Article View: 75 PDF Download: 34 |
||