Solid-state random microlasers fabricated via femtosecond laser writing

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Physics

Background:

• Random lasing offers an alternative to traditional laser designs.
• Microstructure fabrication is key for developing compact optical devices.

Purpose of the Study:

• To demonstrate resonant random lasing in novel polymeric microstructures.
• To explore the potential of these devices for integrated optics applications.

Main Methods:

• Fabrication of Rhodamine B-doped polymeric microstructures using femtosecond laser writing via two-photon polymerization.
• Excitation of the microstructures with a pulsed laser at 532 nm.

Main Results:

• Demonstration of resonant random lasing in on-chip microdevices for the first time.
• Observation of multimode emission with randomly distributed narrow peaks due to spatially localized feedback.
• Lasing threshold on the order of tens of nanojoules, comparable to conventional microcavities.

Conclusions:

• Femtosecond laser-written polymeric microstructures can act as efficient random lasers.
• These devices show significant potential for solid-state laser applications in integrated optics.