Spectro-temporal behavior of dye-based solid-state random lasers under a picosecond pumping regime: Part III

Area of Science:

• * Physics
• * Materials Science
• * Optics

Background:

• * Previous studies investigated spectro-temporal properties of random laser emission in dye-doped powders under picosecond pumping.
• * Emission pulses exhibit narrow spectro-temporal widths near the theoretical limit (ΔωΔt≅1), attributed to photon path length distributions within the diffusive medium.
• * A theoretical model based on photon path lengths was previously developed to explain these observations.

Purpose of the Study:

• * To develop a parameter-free implemented model for random laser emission, consistent with material properties.
• * To investigate the spatial characteristics of the random laser emission.
• * To validate theoretical predictions regarding spatial fluctuations.

Main Methods:

• * Development of a new theoretical model for random laser emission, independent of fitting parameters.
• * Experimental measurement of the transverse coherence size of emitted photon packets.
• * Analysis of spatial emission properties and fluctuations.

Main Results:

• * The implemented model successfully describes the energetic and spectro-temporal properties of the random laser emission.
• * The transverse coherence size of photon packets was experimentally determined.
• * The existence of spatial fluctuations in the emission was confirmed, aligning with model predictions.

Conclusions:

• * The developed model provides a robust framework for understanding random laser emission from dye-doped powders.
• * The study elucidates both spectro-temporal and spatial properties of this emission.
• * Experimental validation supports the theoretical predictions of spatial fluctuations in random laser emission.