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Q-switched vortex waveguide laser generation based on LNOI thin films with implanted Ag nanoparticles.
Optics Express
|November 29, 2023
Summary
Researchers developed a novel Q-switched vortex waveguide laser using silver-nanoparticle-doped lithium niobate on insulator (Ag:LNOI) as a saturable absorber. This integrated photonics approach enables high-repetition-rate, narrow-pulse vortex laser generation.
Area of Science:
- Integrated Photonics
- Materials Science
- Laser Physics
Background:
- Lithium niobate on insulator (LNOI) thin films are crucial for integrated photonics.
- Developing novel saturable absorbers is key for advanced laser applications.
Purpose of the Study:
- To propose and demonstrate a Q-switched vortex waveguide laser using Ag:LNOI.
- To investigate the saturable absorption properties of Ag:LNOI.
- To integrate Ag:LNOI into a waveguide platform for laser generation.
Main Methods:
- Fabrication of Ag:LNOI thin films.
- Characterization of saturable absorption using Z-scan.
- Integration of Ag:LNOI into a Nd:YAG waveguide via femtosecond laser direct writing.
- Construction of a passive Q-switched vortex laser resonator with helical phase plates.
Main Results:
- Ag:LNOI exhibits suitable saturable absorption characteristics.
- A passive Q-switched vortex waveguide laser was successfully realized.
- The laser operates in the near-infrared region with high repetition rate and narrow pulse duration.
Conclusions:
- Ag:LNOI is a promising material for on-chip saturable absorbers.
- This work paves the way for integrated vortex waveguide laser sources.
- The developed platform showcases potential for advanced photonic integrated circuits.
