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Simple and efficient defect-tailored fiber-based UV-VIS broadband white light generation
Chien-Chih Lai1, Nai-Chia Cheng, Cheng-Kai Wang
1Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan. cclai@mail.ndhu.edu.tw
Optics Express
|June 22, 2013
Summary
Researchers developed a novel hybrid fiber for efficient ultraviolet-visible broadband light generation. This method utilizes color centers in sapphire to produce white light with high optical efficiency.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Broadband light generation is crucial for various optical applications.
- Sapphire (Al2O3) is a robust material with potential for luminescence applications.
- Hybrid fiber structures offer unique optical properties.
Purpose of the Study:
- To demonstrate a facile approach for ultraviolet-visible broadband generation.
- To utilize a sapphire crystal core-borosilicate glass cladding hybrid fiber.
- To investigate the role of color centers in broadband emission.
Main Methods:
- Laser-heated pedestal growth technique was employed to fabricate the hybrid fiber.
- Formation of F- and F(2)-type color emitters was facilitated by Ti(4+) ions and Al(3+) vacancies.
- Characterization of optical properties under 325-nm excitation.
Main Results:
- Efficient luminescence and high crystallinity of the sapphire core were maintained.
- Ultraviolet, blue, and green emissions (370, 450, 540 nm) were intensified by color centers.
- Red emission (650 nm) was attributed to Cr(3+) ions.
- Over 1-mW white light achieved with nearly 5% optical-to-optical efficiency.
Conclusions:
- The proposed hybrid fiber is effective for broadband white light generation.
- Color centers play a significant role in achieving the desired spectral output.
- The demonstrated method offers a promising route for developing efficient white light sources.
