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High-Q integrated lithium tantalate microring resonators for on-chip comb generation
Optics Letters
|October 15, 2024
Summary
Lithium tantalate on insulator (LTOI) microring resonators achieve high-Q values for generating tunable Kerr and electro-optic (EO) combs. This demonstrates LTOI
Area of Science:
- Integrated Photonics
- Materials Science
- Nonlinear Optics
Background:
- Lithium tantalate on insulator (LTOI) offers cost-effectiveness, low optical loss, and a strong electro-optic (EO) coefficient, making it promising for integrated photonics.
- Monolithic nonlinear source generators with tunable features are essential for advancing optical platforms.
Purpose of the Study:
- To fabricate low-loss microring resonators on LTOI.
- To demonstrate both Kerr and electro-optic (EO) frequency combs using these resonators.
- To investigate the interplay between photorefractive (PR) effects and thermo-optic modulation in LTOI resonators.
Main Methods:
- Fabrication of high-Q microring resonators using subtractive manufacturing.
- Realization of Kerr and EO combs on X-cut LTOI resonators.
- Laser scanning technique to observe soliton steps and analyze PR effects and thermo-optic modulation.
- Experimental verification of static EO comb generation in a 20 GHz free spectral range (FSR) resonator.
Main Results:
- Achieved microring resonators with intrinsic Q values exceeding 4 × 10^6.
- Successfully generated both Kerr and EO combs on the LTOI platform.
- Elucidated the complex interaction between photorefractive (PR) effects and thermo-optic modulation.
- Observed soliton steps via laser scanning.
- Demonstrated preliminary static EO comb generation, confirming platform versatility.
Conclusions:
- X-cut LTOI microring resonators are a versatile platform for generating high-quality, tunable microcombs.
- The platform supports both Kerr and EO comb generation, crucial for on-chip applications.
- Understanding and mitigating PR effects alongside thermo-optic modulation is key for optimizing LTOI-based photonic devices.
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