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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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Laser intensity-dependent nonlinear-optical effects in organic whispering gallery mode cavity microstructures
Optics Letters
|August 16, 2020
Summary
We investigated photobleaching and two-photon absorption in nonlinear dye microresonators. Intensity-dependent photobleaching plays a key role in the appearance of two-photon luminescence (TPL), crucial for understanding lasing in these systems.
Area of Science:
- Nonlinear optics
- Materials science
- Photonics
Background:
- Nonlinear microresonators are vital for diverse applications.
- Up-conversion processes in these resonators are sensitive to intensity-dependent effects.
- Understanding these effects is crucial for optimizing resonator performance.
Purpose of the Study:
- To investigate two-photon absorption and photobleaching in dye spherical microresonators.
- To model the threshold-like dependence of two-photon luminescence (TPL) on pump power.
- To elucidate the role of intensity-dependent photobleaching in TPL appearance.
Main Methods:
- Utilized 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4 H-pyran dye spherical microresonators.
- Developed a theoretical model for TPL dependence on pump power.
- Experimental validation of the proposed model.
Main Results:
- Demonstrated the significant role of intensity-dependent photobleaching in TPL.
- Observed a threshold-like dependence of TPL on pump power.
- Achieved good agreement between the model and experimental results.
Conclusions:
- Intensity-dependent photobleaching is critical for TPL in nonlinear dye microresonators.
- The findings are essential for analyzing and predicting lasing behavior.
- This research advances the understanding of nonlinear optical phenomena in microresonator systems.
