Broadband atomic-layer MoS₂ optical modulators for ultrafast pulse generations in the visible range

Area of Science:

• Optics and Photonics
• Materials Science
• Condensed Matter Physics

Background:

• Visible lasers are significant, with recent Nobel Prizes highlighting their importance.
• Development of blue laser diodes (LDs) spurs interest in LD-pumped solid-state visible lasers.
• Scarce visible optical modulators limit the realization of solid-state ultrafast visible lasers.

Purpose of the Study:

• To investigate the potential of atomic-layer molybdenum disulfide (MoS2) as a visible optical modulator.
• To develop and select broadband MoS2 optical modulators for visible ultrafast pulse generation.
• To realize broadband mode-locked ultrafast lasers in the visible range using MoS2 modulators.

Main Methods:

• Revealing layer-dependent nonlinear absorption of atomic-layer MoS2 in the visible spectrum.
• Developing and selecting broadband MoS2 optical modulators based on design criteria for 2D materials.
• Integrating selected MoS2 optical modulators into solid-state praseodymium lasers.

Main Results:

• Demonstrated layer-dependent nonlinear absorption of atomic-layer MoS2 in the visible range.
• Successfully developed broadband atomic-layer MoS2 optical modulators.
• Achieved broadband mode-locked ultrafast lasers spanning 522 to 639 nm by employing MoS2 modulators.

Conclusions:

• Atomic-layer MoS2 shows significant potential as a visible optical modulator.
• The developed MoS2 modulators enable the generation of visible ultrafast lasers.
• This work is expected to advance visible ultrafast photonics and the applications of 2D optoelectronic materials.