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Enhanced second harmonic generation performance in PPLN crystal using integrated fiber microlenses.
Optics Express
|December 19, 2025
Summary
Integrated fiber optic microlenses offer a compact solution for ultrafast second harmonic generation (SHG). This novel approach simplifies alignment and significantly boosts conversion efficiency compared to traditional bulk optics setups.
Area of Science:
- Nonlinear Optics
- Integrated Photonics
- Fiber Optics
Background:
- Second Harmonic Generation (SHG) is crucial for frequency conversion.
- Traditional SHG setups use bulky free-space optics, posing alignment challenges.
- There is a need for compact and efficient SHG systems.
Purpose of the Study:
- To demonstrate the application of fiber optic microlenses for ultrafast SHG.
- To develop a compact, fiber-integrated solution for SHG.
- To compare the performance of microlens-based SHG with bulk optics setups.
Main Methods:
- Fabrication of fiber optic microlenses using a three-electrode arc discharge in a large-diameter splicing system.
- Utilizing a 1560 nm femtosecond laser source for SHG experiments.
- Comparative analysis of bulk optics and microlens-based setups, measuring SHG power, spectrum, and pulse duration.
Main Results:
- The microlens configuration significantly reduced system complexity.
- Achieved higher conversion efficiency with a maximum SHG power of 65.3 mW.
- Demonstrated a maximum SHG efficiency of 49.7%, outperforming the bulk optics setup.
Conclusions:
- Fiber optic microlenses provide a viable and efficient alternative for ultrafast SHG.
- Integrated fiber microlens systems simplify alignment and enhance performance in nonlinear optical applications.
- This technology paves the way for more compact and robust SHG devices.
