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Updated: Feb 22, 2026
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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Self-frequency doubling in a laser-active whispering-gallery resonator
Optics Letters
|September 29, 2017
Summary
This study demonstrates combined lasing and frequency doubling in a single neodymium-doped lithium niobate whispering-gallery resonator, producing green light from a low-cost laser diode. This integrated approach offers a novel pathway for compact nonlinear optical devices.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Whispering-gallery resonators offer high optical confinement for nonlinear processes.
- Neodymium-doped lithium niobate is a promising material for integrated optics.
Purpose of the Study:
- To demonstrate simultaneous lasing and self-frequency doubling in a single whispering-gallery resonator.
- To achieve efficient green light generation from a compact device.
Main Methods:
- Fabrication of a millimeter-sized neodymium-doped lithium niobate whispering-gallery resonator.
- Pumping the resonator with a low-cost 808-nm laser diode.
- Characterization of lasing at 1.08 μm and subsequent second-harmonic generation.
Main Results:
- Achieved stable lasing and self-frequency doubling within the same resonator.
- Generated green light via the nonlinear χ(2) process.
- Observed an electrical-optical efficiency of up to 2×10⁻⁴.
Conclusions:
- This work presents the first integration of lasing and second-harmonic generation in a single high-Q whispering-gallery resonator.
- The demonstrated approach is versatile and applicable to other materials and nonlinear optical processes.
- This offers a pathway towards compact and efficient integrated photonic devices.
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