Ultraviolet-light-induced absorption changes in highly Zn-doped LiNbO(3)
Optics Express
|June 12, 2009
Summary
Ultraviolet-light-induced absorption in Zn-doped lithium niobate crystals shows transient buildup in violet-blue light but not in green-red light. This behavior is explained by a three-level model involving trapped holes and iron impurities.
Area of Science:
- Solid State Physics
- Materials Science
- Optical Materials
Background:
- Lithium niobate (LiNbO3) is a crucial material for optoelectronics.
- Understanding light-induced absorption is vital for device stability.
- Zinc doping and iron impurities influence LiNbO3 optical properties.
Purpose of the Study:
- Investigate ultraviolet-light-induced absorption (UVLIA) in Zn-doped LiNbO3.
- Characterize the spectral dependence and temporal dynamics of UVLIA.
- Elucidate the underlying physical mechanisms responsible for UVLIA.
Main Methods:
- Studied UVLIA at room temperature using various probe wavelengths (violet to near-infrared).
- Observed transient dark buildup of absorption.
- Analyzed temporal evolution using stretched exponential functions.
Main Results:
- Transient dark buildup of UVLIA was observed for probe wavelengths below 500 nm (violet-blue).
- No transient buildup was observed for probe wavelengths above 500 nm (green-red).
- The temporal decay of UVLIA followed a sum of two stretched exponential functions.
Conclusions:
- The observed UVLIA dynamics are explained by a three-level model.
- The model involves two types of hole-trapped oxygen vacancy (O-) centers.
- An unintentional iron (FeLi) impurity level contributes to the absorption.
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