Graphene saturable absorber mirror for ultra-fast-pulse solid-state laser.

Area of Science:

• Materials Science
• Optics and Photonics
• Nanotechnology

Background:

• Graphene, a single layer of carbon atoms, possesses unique electronic and optical properties.
• Liquid-phase exfoliation is a promising method for large-scale graphene production.
• Developing high-quality, large-area graphene is crucial for advanced applications.

Purpose of the Study:

• To synthesize high-quality graphene sheets with large lateral dimensions.
• To fabricate a saturable absorber mirror using the synthesized graphene.
• To demonstrate mode-locking operation in a diode-pumped Nd:GdVO(4) laser using the graphene-based saturable absorber.

Main Methods:

• Wormlike graphite was treated with a mixed oxidizer.
• The treated graphite was subjected to bath sonication to exfoliate graphene sheets.
• A saturable absorber mirror was fabricated using the obtained graphene sheets.
• Mode-locking operation was achieved in a diode-pumped Nd:GdVO(4) laser.

Main Results:

• High-quality graphene sheets with lateral sizes exceeding 20 μm were successfully synthesized.
• The largest graphene sheets produced via liquid-phase exfoliation to date were obtained.
• A graphene-based saturable absorber mirror was fabricated and utilized.
• Mode-locking operation was demonstrated, yielding a pulse duration of 16 ps.

Conclusions:

• The developed method enables the production of large-area, high-quality graphene sheets.
• Graphene saturable absorbers are effective for achieving mode-locking in solid-state lasers.
• The synthesized graphene shows potential for applications in ultrafast optics and photonics.