کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1494734 | 992918 | 2013 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Optical bistability of azo dye-doped PMMA polymer Optical bistability of azo dye-doped PMMA polymer](/preview/png/1494734.png)
• The optical bistability of DR1-doped PMMA polymer is investigated.
• The experimental set up is Mach–Zehnder interferometer.
• Two dominant mechanisms: Cis–Trans isomerization and local thermal effect.
• Comparing the gain of OB based on applying internal and external feedbacks.
In this paper, the optical bistability (OB) in three DR1-doped PMMA polymer samples with different thicknesses is experimentally investigated. The measurements are performed in the presence and absence of external feedback in a Mach–Zehnder interferometer nonlinear-ring-cavity. A CW Nd:YAG laser (λ = 532 nm) with 300 mW power is used to interact with the thin polymer films. The results show a hysteresis loop due to optical bistability, indicating that increase of feedback (by 20%) results in OB-index increase. So, increasing the external feedback improved the OB-gain. Cis–Trans isomerization and local thermal effect are responsible for OB-hysteresis loop observation.
Journal: Optical Materials - Volume 35, Issue 9, July 2013, Pages 1619–1622