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Persistent coherent random lasing using resonant scatterers.

Ravitej Uppu¹, Sushil Mujumdar

¹Nano-Optics and Mesoscopic Optics Laboratory, Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Mumbai 400005, India.

|November 24, 2011

Summary

This summary is machine-generated.

Coherent random lasers with resonant scatterers exhibit a wavelength persistence interval linked to Mie resonances. This interval, tunable by scatterer size, reduces fluctuations in random laser output.

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Area of Science:

Photonics and light scattering phenomena.
Coherent random laser physics.
Resonant scattering principles.

Background:

Coherent random lasers offer unique light emission properties.
Understanding photon propagation in scattering media is crucial.
Single-particle resonances influence light-matter interactions.

Purpose of the Study:

Investigate the frequency behavior of coherent random lasers.
Analyze the role of resonant scatterers in laser modes.
Determine the tunability of laser output characteristics.

Main Methods:

Employed a three-dimensional photon propagation model.
Computed wavelength-sensitive path length distribution of fluorescence photons.
Analyzed Mie resonances of individual scatterers.

Main Results:

Observed a persistence interval of wavelengths for coherent random lasing modes.
Correlated this interval with Mie resonances of scatterers.
Noted reduced wavelength fluctuations due to gain competition.
Demonstrated tunability of the persistence interval by varying scatterer size parameter.

Conclusions:

The persistence interval is a key feature of coherent random lasers with resonant scatterers.
Mie resonances dictate the stability of lasing modes within this interval.
Gain competition plays a vital role in spectral stability.
Scatterer size offers a method for tuning laser properties.