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Metal-dielectric dispersive mirrors for ultraviolet lasers
Optics Express
|November 22, 2024
Summary
We developed a novel metal-dielectric dispersive mirror (MDDM) for near-ultraviolet (UV) applications. This broadband UV mirror precisely compensates for dispersion, enabling the generation of ultrashort 15 fs UV pulses.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Dispersive mirrors are crucial for ultrashort pulse generation.
- Existing mirrors face limitations in the near-ultraviolet (UV) spectrum regarding bandwidth and dispersion control.
Purpose of the Study:
- To design and fabricate a broadband metal-dielectric dispersive mirror (MDDM) for the near-UV region.
- To achieve precise dispersion compensation and enable ultrashort UV pulse generation.
Main Methods:
- Utilized aluminum (Al) for wide UV bandwidth and HfO2/SiO2 multilayers for dispersion control.
- Incorporated a shortwave reflection enhancement structure (SWRES) to suppress group delay dispersion (GDD) oscillations.
- Fabricated and characterized the designed MDDM.
Main Results:
- Achieved a broadband MDDM with low total thickness and precise dispersion compensation.
- Successfully suppressed GDD oscillations using the SWRES.
- Generated 15 fs UV pulses using the fabricated MDDM.
Conclusions:
- Metal-dielectric structures offer enhanced performance for UV dispersive mirrors.
- The developed MDDM technology is foundational for next-generation UV femtosecond laser systems.
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