Stimulated Raman scattering of dyes under random lasing in polymeric vesicular films

TL;DR

This paper investigates the coupling of stimulated Raman scattering with random lasing in dyed polymeric vesicular films at helium temperature, revealing Raman lines enhanced by stimulated emission and a structured spectrum enabling detection of weak lines.

Contribution

It demonstrates the coupling effect of stimulated Raman scattering with random lasing in polymeric films and characterizes the spectral features and intensity trends of Raman lines under these conditions.

Findings

Raman lines appear in the random lasing spectrum due to stimulated Raman scattering.

Raman line intensity scales quadratically with pump intensity.

SRS spectrum is more structured than spontaneous Raman spectrum, aiding detection.

Abstract

The random lasing (RL) emission of dyed vesicular polymeric films in diffusive regime of light propagation was investigated under helium temperature. It represents itself the coupling effect of stimulated emission and stimulated Raman scattering (SRS). Due to the effect a set of Raman lines reveal in RL spectrum. Distinguishing feature of the effect is the stimulated emission promotes the Raman lines revealing. Intensity of Raman lines have quadratic trend on pump intensity. Furthermore SRS in this condition has the more structured spectrum than spontaneous Raman one. It makes enable detection even the weak and close located spectral lines.