A Broadband High-Diffraction-Efficiency Electro-Optic Bragg Deflector Based on Monolithic Dual-Grating Periodically-Poled Lithium Niobate
| Autor: | Shou-Tai Lin, Yen-Yin Lin, Yuan-Yao Lin, A.C. Chiang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Lithium niobate Physics::Optics Bragg's law Biasing Grating Diffraction efficiency Atomic and Molecular Physics and Optics TA1501-1820 chemistry.chemical_compound Optics chemistry Physics::Accelerator Physics Applied optics. Photonics Radiology Nuclear Medicine and imaging Acceptance angle Bragg deflectors Strong focusing PPLN business lithium niobite Instrumentation Beam (structure) |
| Zdroj: | Photonics, Vol 8, Iss 242, p 242 (2021) Photonics Volume 8 Issue 7 |
| ISSN: | 2304-6732 |
| Popis: | Electro-optic (EO) Bragg deflectors have been extensively used in a variety of applications. Recent developments show that bandwidths and deflection efficiencies, as well as angular bandwidths, would significantly limit the utilization of EO Bragg deflectors, especially for applications which need strong focusing, such as intra-cavity applications. In this paper, we introduce a broadband EO Bragg deflector based on periodically-poled lithium niobate with a monolithic dual-grating design. We analyzed the deflection properties of this device by using a modified coupled wave theory and showed that this device can be still efficient for a small beam radius under strong focusing, whereas a single-grating one becomes very inefficient. Using a 1064-nm laser beam with a 100-μm beam radius, we obtained a 74% deflection efficiency with a 190-V bias voltage with a 0.5-mm-thick and 7.5-mm-long dual-grating sample. The acceptance angle for the Bragg condition of this device is as large as a few tens of mrad. The potential bandwidth of this device exceeds 500 nm if the proper operation region is chosen. |
| Databáze: | OpenAIRE |
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