A disordered structure embedding an active gain material and able to lase is
called random laser (RL). The RL spectrum may appear either like a set of sharp
resonances or like a smooth line superimposed to the fluorescence. A recent
letter accounts for this duality with the onset of a mode locked regime in
which increasing the number of activated modes results in an increased inter
mode correlation and a pulse shortening ascribed to a synchronization
phenomenon. An extended discussion of our experimental approach together with
an original study of the spatial properties of the RL is reported here.Comment: 9 Pages; 16 Figure

A. Yariv

C. Conti

C. López

M. Leonetti

V. Letokhov

English

arXiv

The spectrum of a random laser (RL) may appear either as a set of sharp resonances or as a smooth line superimposed on the fluorescence. Recently, Leonetti, Conti, and Lopez accounted for this duality with the onset of a mode-locked regime that is triggered by the increase of both the number of activated modes and of the intermode interaction and is accompanied by a pulse shortening. Here we report an extensive review of the experimental approach used by Leonetti, including the sample preparation and the particulars of the setup. Here we describe also the way in which our approach allows us either to set the degree of interaction between modes or to have a certain degree of control over the effective set of resonances brought to lasing. Moreover we report an investigation on the spatial properties of the RL which brings further confirmation of the synchronization picture, whose physical origin is deepened. © 2012 American Physical Society

C. Lopez

CONTI, CLAUDIO

Archivio della ricerca- Università di Roma La Sapienza

Random laser tailored by directional stimulated emission

The spectrum of a random laser (RL) may appear either as a set of sharp resonances or as a smooth line superimposed on the fluorescence. Recently, Leonetti, Conti, and Lopez accounted for this duality with the onset of a mode-locked regime that is triggered by the increase of both the number of activated modes and of the intermode interaction and is accompanied by a pulse shortening. Here we report an extensive review of the experimental approach used by Leonetti, including the sample preparation and the particulars of the setup. Here we describe also the way in which our approach allows us either to set the degree of interaction between modes or to have a certain degree of control over the effective set of resonances brought to lasing. Moreover we report an investigation on the spatial properties of the RL which brings further confirmation of the synchronization picture, whose physical origin is deepened. © 2012 American Physical Society.This work was supported by ERC Grant (FP7/2007-2013) No. 201766, CINECA, EU FP7 NoE Nanophotonics4Enery Grant No. 248855, the Spanish MICINN CSD2007-0046 (Nanolight.es), MAT2009-07841 (GLUSFA), and Comunidad de Madrid S2009/MAT-1756 (PHAMA).Peer Reviewe

A random laser tailored by directional stimulated emission

Abstract

Similar works

Full text

Available Versions

Archivio della ricerca- Università di Roma La Sapienza

Digital.CSIC

Crossref