Lasing in Three Layer Systems Consisting of Cholesteric Liquid Crystals and Dye Solution

Chilaya, G. S.; Chanishvili, Andro; Petriashvili, Gia; Barberi, R.; Cipparrone, G.; Mazzulla, A.; Santo, Maria P. De; Sellame, H.; Matranga, M. A.

doi:10.1080/15421400802430521

Cited by 10 publications

(7 citation statements)

References 43 publications

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“…In 1980, for the first time Ilchishin demonstrated lasing from a dye-doped CLC (DD-CLC) [5]. Since then, laser emission has been demonstrated in several CLC based systems [6–8]. Further, since the PBG spectral position can be shifted, also the laser emission wavelength can be tuned by using external factors as the temperature variations.…”

Section: Introductionmentioning

confidence: 99%

Temperature-tunable lasing from dye-doped chiral microdroplets encapsulated in a thin polymeric film

Petriashvili

Bruno

Santo

et al. 2018

Beilstein J. Nanotechnol.

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In the last decade, much interest has grown around the possibility to use liquid-crystal droplets as optical microcavities and lasers. In particular, 3D laser emission from dye-doped cholesteric liquid crystals confined inside microdroplets paves the way for many applications in the field of sensors or tunable photonics. Several techniques can be used to obtain small microresonators as, for example, dispersing a liquid crystal inside an immiscible isotropic fluid to create an emulsion. Recently, the possibility to obtain a thin free-standing film starting from an emulsion having a mixture of water and polyvinyl alcohol as isotropic matrix has been reported. After the water evaporation, a polymeric film in which the microdroplets are encapsulated has been obtained. Bragg-type laser emission has been recorded from the emulsion as well as from the thin film. Here, we report on the possibility to tune the laser emission as a function of temperature. Using a chiral dopant with temperature dependent solubility, the emitted laser wavelength can be tuned in a range of 40 nm by a temperature variation of 18 °C. The proposed device can have applications in the field of sensors and for the development of anti-counterfeiting labels.

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Section: Introductionmentioning

confidence: 99%

Temperature-tunable lasing from dye-doped chiral microdroplets encapsulated in a thin polymeric film

Petriashvili

Bruno

Santo

et al. 2018

Beilstein J. Nanotechnol.

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“…Lasers employing the former mechanism are called distributed Bragg reflector (DBR) lasers and the latter are called distributed feedback (DFB) lasers. To date, most studies have investigated the DFB-ChLC laser system in which the laser dye is directly doped in ChLCs [2][3][4][5][6][7] , and only a few studies have investigated ChLC lasers with the DBR structure due to the difficulty of obtaining single-mode lasing in DBR-type laser system [8][9] . However, DBR-ChLC lasers in which the gain medium is separated from the ChLC cavity and the choice of luminescent materials is almost infinite, is expected to outperform DFB-ChLC lasers in terms of slope efficiency.…”

Section: Introductionmentioning

confidence: 99%

Slope efficiency characteristics of mode-hop driven tunable single-mode cholesteric liquid crystal laser

et al. 2011

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We report tunable single-mode lasing with an improved slope efficiency from a cholesteric liquid crystal (ChLC) cavity with a three-layered structure. The device consists of one photopolymerized ChLC layer with a wide reflection band, another ChLC layer with a notch reflection band and a Rhodamine-6G-doped ionic liquid layer acting as the gain medium. Single-mode lasing can be obtained in this device structure because the ChLC layer with the notch reflection band strongly reflects only one of the Fabry-Perot cavity modes. Tuning of the lasing wavelength is achieved by tuning the reflection band of the notch ChLC. The device showed a maximum slope efficiency of 16%, which was found to be approximately 1.5 times larger than that of ordinary ChLC lasers doped with the pyrromethene 597 laser dye.

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“…To date, most studies have investigated the DFB-ChLC laser system in which the laser dye is directly doped in ChLCs, [2][3][4][5][6][7] and only a few studies have investigated ChLC lasers with the DBR structure. 8,9) In particular, while wavelength tuning 8) and simultaneous multicolor lasing 9) have been reported for DBR-ChLC lasers, the slope efficiency of these lasers, which is one of the most important properties of optically pumped lasers, had not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Slope Efficiency Improvement in Mode-Hop Driven Tunable Single-Mode Cholesteric Liquid Crystal Laser

Inoue

Yoshida

Inoue

et al. 2011

Jpn. J. Appl. Phys.

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We report the improvement in the slope efficiency of tunable single-mode cholesteric liquid crystal (ChLC) lasers with a three-layered structure. The device consists of one photopolymerized ChLC layer with a wide reflection band, another ChLC layer with a notch reflection band, and a rhodamine-6G-doped ionic liquid layer acting as the gain medium. Single-mode lasing is obtained from this device structure because the ChLC layer with the notch reflection band strongly reflects only one of the Fabry–Perot cavity modes, and the mode-hop-driven tuning of the lasing wavelength is possible because the reflection band of the notch ChLC can be tuned using external stimuli, such as heat. Our device showed a maximum slope efficiency of 16% (considering emission only in the forward direction), and was found to be approximately 1.5 times larger than that of ordinary ChLC lasers doped with the pyrromethene 597 laser dye. The improvement in the slope efficiency is believed to be attributed to the high quantum efficiency of the rhodamine 6G dye, which cannot be used in conventional ChLC lasers because of its low solubility, but can be used in our device because of the isotropic gain medium employed.

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Lasing in Three Layer Systems Consisting of Cholesteric Liquid Crystals and Dye Solution

Cited by 10 publications

References 43 publications

Temperature-tunable lasing from dye-doped chiral microdroplets encapsulated in a thin polymeric film

Temperature-tunable lasing from dye-doped chiral microdroplets encapsulated in a thin polymeric film

Slope efficiency characteristics of mode-hop driven tunable single-mode cholesteric liquid crystal laser

Slope Efficiency Improvement in Mode-Hop Driven Tunable Single-Mode Cholesteric Liquid Crystal Laser

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