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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Nonlinear microfiber loop resonators for resonantly enhanced third harmonic generation.

Rand Ismaeel¹, Timothy Lee, Ming Ding

¹Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.

|December 22, 2012

Summary

This summary is machine-generated.

We demonstrate enhanced third harmonic generation using microfiber loop resonators. This method boosts conversion efficiency by exploiting high pump intensity on resonance.

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Area of Science:

Nonlinear optics
Photonics
Materials science

Background:

Third harmonic generation (THG) is a fundamental nonlinear optical process.
Microfiber resonators offer enhanced light-matter interaction for nonlinear phenomena.
Achieving efficient THG typically requires phase matching and high optical intensity.

Purpose of the Study:

To model and demonstrate resonantly enhanced third harmonic generation (THG) in microfiber loop resonators.
To investigate the use of high pump field intensity for improved THG conversion efficiency.
To fabricate and characterize silica microfibers for optimal phase matching and resonator formation.

Main Methods:

Modeling of third harmonic generation in microfiber loop resonators.
Fabrication of silica microfibers with specific waist diameters (approx. 0.76 μm) for intermodal phase matching.
Formation of microfiber loop resonators by twisting fiber ends (down to 6 mm diameter).
Pumping with 1.55 μm wavelength, 4 ns pulses at 100 W peak power.

Main Results:

Demonstration of resonantly enhanced THG in microfiber loop resonators.
Achieved a conversion efficiency of 3×10⁻⁶ over an interaction length of ~1 mm.
Observed resonant enhancements up to 7.7 dB in the loop resonators.
Intermodal phase matching was ensured by microfiber waist diameter control.

Conclusions:

Resonantly enhanced THG is feasible and effective in microfiber loop resonators.
Exploiting high pump intensity on resonance significantly improves THG conversion.
Microfiber loop resonators provide a promising platform for efficient nonlinear optical processes.