Abstract
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=532nm) with 300mW 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.
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