Phase-locked random lasing in patterned microstripes of MAPbBr₃ porously structured with nanoholes

Area of Science:

• Photonics and Laser Physics
• Materials Science
• Quantum Optics

Background:

• Mode locking is challenging in random lasing due to strong scattering and nonlinear interaction requirements.
• The cascaded absorption and stimulated emission (CASE) effect in perovskites offers a novel solution.
• Previous studies achieved phase-locked random lasing in nanoparticle systems.

Purpose of the Study:

• To demonstrate phase-locked random lasing in a new nanoporous material architecture.
• To investigate the underlying physics of phase-locking in random lasers using the CASE effect.
• To explore the potential of hybrid organic-inorganic perovskites for advanced laser applications.

Main Methods:

• Fabrication of nanohole-structured MAPbBr3 microstripes using photolithography and spin-coating.
• Femtosecond transient absorption spectroscopy to resolve CASE dynamics.
• Analysis of spectral line spacing to identify phase-locked modes.

Main Results:

• Successfully demonstrated phase-locked random lasing in nanoporous perovskite microstripes.
• Observed CASE features with oscillations in transient absorption dynamics (<400 fs).
• Identified equally spaced spectral lines (1.26-1.58 nm separation) confirming phase-locking.

Conclusions:

• Verified phase-locking mechanisms for random lasers in a nanoporous scheme.
• The CASE effect in perovskites is crucial for achieving phase-locked random lasing.
• This work opens new avenues for developing advanced random laser devices.