Thermo-recurrent nematic random laser

被引：47

作者：

Ferjani, S. ^{[1
,2
]}

De Luca, A. ^{[1
,2
]}

Barna, V. ^{[3
]}

Versace, C. ^{[1
,2
]}

Strangi, G. ^{[1
,2
]}

机构：

[1] Univ Calabria, LICRYL, CNR, INFM, I-87036 Arcavacata Di Rende, CS, Italy

[2] Univ Calabria, Ctr Excellence, CEMIF CAL, Dept Phys, I-87036 Arcavacata Di Rende, CS, Italy

[3] Univ Bucharest, Fac Phys, Bucharest 077125, Magurele, Romania

来源：

OPTICS EXPRESS | 2009年 / 17卷 / 03期

关键词：

MULTIPLE LIGHT-SCATTERING; WEAK-LOCALIZATION; DIFFUSION;

D O I：

10.1364/OE.17.002042

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

This experimental work is aimed to investigate the thermal behavior of random laser action in dye doped nematic liquid crystals. The study evidenced an important temperature dependence of the random lasing characteristics in the nematic phase and in close proximity of the nematicisotropic (N-I) phase transition. A lowering of the laser emission intensity as the temperature increases is strictly related to the shift of the lasing threshold as function of the temperature even though the pump energy is kept fixed. The optical losses increasing owing to the thermal fluctuation enhanced scattering drive the input-output smoother behavior until the system stops to lase, because below threshold. The unexpected reoccurrence of random lasing at higher temperature, in proximity of N-I transition is found to be related to a different scattering mechanism, the micro-droplets nucleation and critical opalescence. (C) 2008 Optical Society of America

引用

页码：2042 / 2047

页数：6

共 20 条

[1] ABSENCE OF DIFFUSION IN CERTAIN RANDOM LATTICES [J].