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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
Continuous-wave stimulated Raman scattering in microdroplets
Optics Letters
|October 2, 2009
Summary
Continuous-wave stimulated Raman scattering was observed in benzene and toluene microdroplets. Enhanced Raman gains were achieved using droplet resonance and cavity quantum electrodynamics (QED) effects, significantly lowering thresholds.
Area of Science:
- Optics and Photonics
- Chemical Physics
- Quantum Optics
Background:
- Stimulated Raman scattering (SRS) is a nonlinear optical process.
- Microdroplets can act as optical cavities, enhancing light-matter interactions.
- Cavity quantum electrodynamics (QED) effects can significantly modify light-matter interactions.
Purpose of the Study:
- To investigate continuous-wave stimulated Raman scattering in microdroplets.
- To explore the role of droplet resonance and cavity QED enhancement in lowering SRS thresholds.
- To analyze the relationship between cavity gain enhancement and spectral properties.
Main Methods:
- Experimental observation of SRS in benzene and toluene microdroplets (11-13 micrometers).
- Utilizing simultaneous pump and Stokes wave resonance within the microdroplets.
- Applying cavity QED principles to quantify Raman gain enhancement.
Main Results:
- SRS observed at low pump intensities (8 kW/cm^2 for benzene, 24 kW/cm^2 for toluene).
- Cavity QED enhancement factor of approximately 50 times compared to bulk liquids.
- Experimental behavior consistent with a photon-state conservation argument for cavity gain.
Conclusions:
- Microdroplets provide an effective platform for low-threshold SRS.
- Simultaneous resonance and cavity QED are crucial for significant Raman gain enhancement.
- The proposed relation for cavity gain enhancement is validated by experimental results.
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