Spatially tunable emissions of dye-doped liquid crystal lasers between the cholesteric and smectic phases

Lin, Ja‐Hon; Liao, Kuan-Cheng; Jian, Li-Hao; Tsay, Shwu-Yun; Wu, Jin−Jei; Duann, Yeh-Gang

doi:10.1364/ome.5.002142

Cited by 8 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liquid crystals (LCs) have been widely used in the display field because of their excellent electro-optical properties and have become ideal fillers for static diffusers. Some research groups have reported studies on speckle reduction by LCs [ [20] , [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] ] because LC molecules have unique birefringence properties and can be modulated by an electric field. LCs are typically used for speckle reduction in the form of polymer LC composites, in which dynamic transition between the scattering and transparent states can be achieved by voltage control.…”

Section: Introductionmentioning

confidence: 99%

Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires

Jiang,

Zhou,

Wang

et al. 2023

Heliyon

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires

Jiang,

Zhou,

Wang

et al. 2023

Heliyon

View full text Add to dashboard Cite

“…Increasing the temperature, more chiral molecules become dispersed in the mixture winding the cholesteric helix and leading to a shift of the photonic band toward shorter wavelengths. By choosing a proper dye, a shift of the emitted laser wavelength is observed [11–12]. …”

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.

View full text Add to dashboard Cite

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.

show abstract

“…On the contrary, compact liquid crystal (LC) devices possess various advantages such as portability and electrically driven capability, which have been extensively used in display technology as a superior light modulator and laser light source. 11,12) Because of the intrinsic birefringence characteristic of LCs, it can be a superior light scatter for random lasing generation 13) and SNS. Recently, Furue et al adopted ferroelectric LCs (FLCs) inside wedge cells for the SNS, and they demonstrated a low speckle contrast of the speckle pattern ∼0.4.…”

mentioning

confidence: 99%

Investigation of laser speckle noise suppression by using polymer-stabilized liquid crystals within twisted nematic cell

Lin

Chang

et al. 2017

Appl. Phys. Express

Self Cite

View full text Add to dashboard Cite

We propose a robust method to suppress laser speckle using a polymer-stabilized liquid crystal (PSLC) device with high initial transmittance. With applied voltage, a large modulation depth has been produced through light scattering because of the refractive index mismatch between the rotated nematic liquid crystals and the polymer networks. By using PSLCs with 5 wt % monomer, a speckle noise reduction rate of approximately 54.7% can be achieved with an applied voltage of 6 V. The lowest speckle contrast of approximately 0.025 with relatively high discrimination from the projected AF image has also been demonstrated through a wedge PSLC cell.

show abstract

Spatially tunable emissions of dye-doped liquid crystal lasers between the cholesteric and smectic phases

Cited by 8 publications

References 16 publications

Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires

Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires

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

Investigation of laser speckle noise suppression by using polymer-stabilized liquid crystals within twisted nematic cell

Contact Info

Product

Resources

About