Random Raman laser shines bright

Abstract

We demonstrate the first experimental evidence of efficient random Raman lasing in a highly scattering powdered medium. Monte Carlo simulations were used to guide the experiment and provide support for experimental findings.

Raman random laser in one-dimensional system

“…4. Clearly, by increasing the dimension, the probability of suitable laser cavity formation and PLO increases, which is in agreement with the previous experimental investigation, where RRL oscillation and even higher-order Stokes frequency oscillations are observed [18,19]. The PNZ of the quasi-mode spectrum and the Raman line shape is a function of the randomness strength, the pump frequency, and the Stokes frequency shift.…”

“…As was expected, the average output power and its variance are increasing functions of the pump power. Although the experimental investigations are in three-dimensional systems [18,19], their results have the same behavior as obtained by this one-dimensional analysis. …”

“…This narrow gain bandwidth restricts the resonance frequency of a random cavity within this small gain window, and hence reduces the observed gain probability. The experimental observation of the Raman laser oscillation in BaSO 4 powder has been reported [19]. It is interesting for possibility of remote detection of powders.…”