Surface-Emitting Perovskite Random Lasers for Speckle-Free Imaging

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Physics

Background:

• Random lasers are valuable for speckle-free imaging but are often bulky.
• Developing compact illumination sources is crucial for practical applications.

Purpose of the Study:

• To demonstrate perovskite-based surface emitting random lasers (SERLs).
• To explore the application of SERLs in speckle-free imaging.

Main Methods:

• Fabrication of perovskite polycrystalline films sandwiched by distributed Bragg reflectors.
• Utilizing multiple scattering within the perovskite film to generate random lasing.
• Characterizing the wavevector properties and spatial coherence of the generated SERLs.

Main Results:

• Successfully generated multimode SERLs with a divergence angle of approximately 3-5 degrees.
• Demonstrated low spatial coherence, characteristic of random lasers.
• Achieved significant suppression of speckle noise in imaging applications.

Conclusions:

• Perovskite SERLs provide a promising strategy for miniaturizing laser illumination systems.
• The developed SERLs effectively reduce speckle noise, enhancing imaging quality.
• This research contributes to the development of integrated, speckle-free imaging systems.