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Related Experiment Video

Updated: May 23, 2026

$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Aerosol-based coherent random laser.

Anjani Kumar Tiwari¹, Ravitej Uppu, Sushil Mujumdar

¹Nano-Optics and Mesoscopic Optics Laboratory, Tata Institute of Fundamental Research, Mumbai, India.

|March 27, 2012

Summary

This summary is machine-generated.

We achieved coherent random lasing in an aerosol of dye-doped microdroplets. Spatial modes extending across the microdroplet array generated ultranarrow lasing modes, demonstrating a novel approach to random laser emission.

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Area of Science:

Optics and Photonics
Condensed Matter Physics

Background:

Random lasing offers potential for low-cost, speckle-free coherent light sources.
Microdroplet aerosols present unique platforms for studying light-matter interactions and wave phenomena.

Purpose of the Study:

To demonstrate coherent random lasing from an aerosol of dye-doped microdroplets.
To investigate the spatial modes responsible for lasing in such a system.

Main Methods:

Generating an aerosol of polydisperse, arbitrarily shaped microdroplets (average size ~30 μm).
Exciting the microdroplet aerosol with optical pumping.
Analyzing emission spectra along the array axis and transverse directions.
Utilizing direct spatiospectral imaging and lasing threshold studies.

Main Results:

Observed ultranarrow lasing modes in the emission along the linear array axis.
Detected intrascatterer resonance peaks in the transverse emission.
Confirmed that lasing originated from spatial modes extending across the entire polydisperse microdroplet array.

Conclusions:

Coherent random lasing is achievable from a linear array of dye-doped microdroplets.
Spatial modes spanning the array are crucial for the observed ultranarrow lasing modes.
This work opens avenues for novel random laser applications using microdroplet aerosols.