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Nonlinear response and optical limiting in SrBi(2)Ta(2)O(9) thin films
Optics Letters
|December 7, 2007
Summary
Strontium bismuth tantalate (SBT) thin films exhibit large negative nonlinear refractive indices, making them promising for optical limiting applications. These findings advance materials science for nonlinear optics.
Area of Science:
- Materials Science
- Nonlinear Optics
- Thin Film Technology
Background:
- Strontium bismuth tantalate (SrBi2Ta2O9 or SBT) is a ferroelectric material with potential nonlinear optical properties.
- Investigating nonlinear optical parameters is crucial for developing advanced optical devices.
Purpose of the Study:
- To prepare SrBi2Ta2O9 (SBT) thin films on quartz substrates.
- To measure the nonlinear refractive indices (n2) and two-photon absorption coefficient of SBT thin films.
- To investigate the optical limiting behavior of SBT thin films.
Main Methods:
- Pulsed-laser deposition (PLD) technique for film preparation.
- Z-scan technique with picosecond pulses for nonlinear refractive index measurement.
- f/5 defocusing geometry for optical limiting investigations.
Main Results:
- Large negative nonlinear refractive indices of -3.84 cm²/GW at 532 nm and -3.58 cm²/GW at 1.064 µm were measured.
- A two-photon absorption coefficient of 7.3 cm/GW at 532 nm was determined.
- Optical limiting behavior was observed for SBT thin films under laser excitation.
Conclusions:
- SBT thin films possess significant negative nonlinear optical properties.
- These properties suggest potential applications in optical limiting devices.
- Further research can explore optimizing SBT films for enhanced nonlinear optical performance.
