Enhanced photonic band edge laser emission in a cholesteric liquid crystal resonator

Zhou, Ying; Huang, Yuhua; Ge, Zhibing; Chen, Liang-Pin; Hong, Qi; Tie-jun, WU; Wu, Shin‐Tson

doi:10.1103/physreve.74.061705

Cited by 24 publications

(21 citation statements)

References 17 publications

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“…Laser dyes with a high order parameter of the transition dipole moment lead to an optimal performance for CLC lasers [7,8]. In addition to an extensive structural study on liquid crystals and laser dyes, a wide variety of optical techniques have been utilized to minimize the losses in CLC cavities and amplify the laser emission resulting in a low threshold and a high efficiency [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

High efficiency cholesteric liquid crystal lasers with an external stable resonator

Shirvani-Mahdavi¹,

Fardad²,

Mohajerani³

et al. 2010

Opt. Express

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An amplified cholesteric liquid crystal (CLC) laser performance is demonstrated by utilizing a binary-dye mixture (with 62 wt% DCM and 38 wt% PM597) as the active medium and an external stable resonator. The measured results show that the laser efficiency is enhanced as compared to the highest efficiency of each individual dye. Furthermore, using such an active CLC in an external stable resonator leads to a approximately 92X improved efficiency over the single CLC laser. In this instance, the binary-dye doped CLC simultaneously functions as laser oscillator and amplifier.

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Section: Introductionmentioning

confidence: 99%

High efficiency cholesteric liquid crystal lasers with an external stable resonator

Shirvani-Mahdavi¹,

Fardad²,

Mohajerani³

et al. 2010

Opt. Express

Self Cite

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“…This is the case when spontaneous emission is isotropic in terms of polarization and it is perhaps reasonable to assume that the stimulated absorption and emission are also isotropic. A similar approach is also followed in [15], where equal small imaginary parts are added to the ordinary and extraordinary refractive indices of the chiral nematic LC slab in order to account for gain in an active cell and therefore calculate the corresponding transmission coefficient of a defect mode structure.…”

mentioning

confidence: 98%

Density of photon states in dye-doped chiral nematic liquid crystal cells in the presence of losses and gain

et al. 2012

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We calculate the density of photon states (DOS) of the normal modes in dye-doped chiral nematic liquid crystal (LC) cells in the presence of various loss mechanisms. Losses and gain are incorporated into the transmission characteristics through the introduction of a small imaginary part in the dielectric constant perpendicular and along the director, for which we assume no frequency dispersion. Theoretical results are presented on the DOS in the region of the photonic band gap for a range of values of the loss coefficient and different values of the optical anisotropy. The obtained values of the DOS at the photonic band gap edges predict a reversal of the dominant modes in the structure. Our results are found to be in good agreement with the experimentally obtained excitation thresholds in chiral nematic LC lasers. The behavior of the DOS is also discussed for amplifying LC cells providing additional insight to the lasing mechanism of these structures.

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“…To reduce the Bragg reflection from the sample, the linearly polarized pump beam passed through an iris was converted into a circularly polarized pump beam by a halfwave plate. 23 The pump beam was separated into two paths by a beam splitter. One was monitored by an energy meter and the other was used as the pump beam.…”

mentioning

confidence: 99%

Random laser emission in a sphere-phase liquid crystal

Zhu

Sun

et al. 2015

Applied Physics Letters

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We investigated random lasing from a fluid self-assembly sphere-phase liquid crystal, which was composed of three-dimensional twist sphere structures with disclinations among them. The threshold energy of the random lasing from sphere-phase liquid crystal was 32% of that from the chiral nematic phase because of the interference associated with multiple scattering by randomly distributed sphere-phase platelets. Such random lasers composed of self-assembly soft organic materials may be useful for holographic displays, point-of-care biomedical analysis, and optical security coatings.

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Enhanced photonic band edge laser emission in a cholesteric liquid crystal resonator

Cited by 24 publications

References 17 publications

High efficiency cholesteric liquid crystal lasers with an external stable resonator

High efficiency cholesteric liquid crystal lasers with an external stable resonator

Density of photon states in dye-doped chiral nematic liquid crystal cells in the presence of losses and gain

Random laser emission in a sphere-phase liquid crystal

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