Microdroplet dye laser enhancing effects in dye-highly scattering intralipid mixture

Tanosaki, Shinji; Taniguchi, Hiroshi; Tsujita, Kazuhiro; Inaba, Humio

doi:10.1063/1.117869

Cited by 27 publications

(3 citation statements)

References 3 publications

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“…2 The microcavity lasing has been studied extensively in systems of semiconductor disk, dye-doped microdroplets, and liquid jet. [3][4][5][6] A microcavity laser consisting of a fused-silica capillary filled with dye-doped liquid is an interesting system, where a coupling exists between the core WGM and the reflected light from the outer surface. Observation of interference modulation from a layered microcylinder was first performed by Knight et al 7,8 Moreover, we recently performed a precise dynamic measurement of the interference period by controlling the refractive index of the liquid continuously.…”

mentioning

confidence: 99%

Cavity-Q-driven spectral shift in a cylindrical whispering-gallery-mode microcavity laser

Moon

Chough

Kim

et al. 2000

Applied Physics Letters

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Cavity-Q-driven spectral shift of lasing was observed in a cylindrical microcavity formed by rhodamine6G-doped quinoline in a capillary. The envelope of lasing spectrum showed a blueshift induced by the decreasing cavity Q of whispering gallery modes as the pump fluence increases. The thermally induced refractive index changes were measured from the shifts of individual lasing modes. The observed cavity-Q-driven spectral shift was well described by a simple dye laser model, which accounts for the dependence of cavity Q on the thermally induced refractive index change.

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confidence: 99%

Cavity-Q-driven spectral shift in a cylindrical whispering-gallery-mode microcavity laser

Moon

Chough

Kim

et al. 2000

Applied Physics Letters

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“…Studies have reported that scattering can serve as a decisive factor for enhanced lasing in the WGM cavity. [40] With more substantial scattering, the light path inside the cavity will be longer, which in turn elongates the photon lifetime inside the cavity. The mentioned three molecules could have a similar effect inside the hydrogel cavity, resulting in a lower lasing threshold.…”

Section: Hydrogel Lasing With Different Biomoleculesmentioning

confidence: 99%

Hydrogel Microlasers for Versatile Biomolecular Analysis Based on a Lasing Microarray

Gong

Qiao

Guan

et al. 2020

Advanced Photonics Research

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Biological microlasers have advanced rapidly in recent years, demonstrating their immense potential to use lasing emission as a sensing signal for monitoring molecular interactions. [1-6] Such lasers are known for their distinct advantages in terms of signal amplification, narrow linewidth, and strong intensity, which lead to unprecedented detection sensitivity of tiny changes in biological systems. [7-11] Most biolasers were realized through the introduction of fluorescent biomolecules (gain) into millimeter-sized resonators, resulting in difficulties for further applications. As such, whispering-gallery-mode (WGM) microlasers have come into play for their high Q factor, low mode volume, and miniaturized size. [12-15] A plethora of biocompatible materials have been used to form microlasers in recent years, including proteins, poly(lactic acid), starch, lipids, liquid crystals, cellulose, and polymers. [13,16-26] To move a step forward, it is essential to realize microlasers with the versatility to design, control, and functionalize different biostructures and molecules within the cavity. Hydrogels, one of the most popular biomaterials, have received tremendous attention for its high versatility among biocompatible materials over decades. [27,28] Endowed with unique 3D network structures and a porous interface, hydrogels enjoy priority in a wide range of applications in drug delivery, therapeutics, tissue engineering, and biosensing devices. [29-31] Hydrogels can be used to encapsulate

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“…). This model would most appropriately describe the case of a continuous random medium such as a laser-dye doped gel or intralipid suspension 20 , where the fluctuations in η r and η i are uncorrelated. Using the Novikov theorem 23 to average over all configurations of η r and η i , we obtain in the Random Phase Approximation (RPA) (i.e., P (r, θ) = P (r)/2π),…”

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confidence: 99%

Reflection of light from a random amplifying medium with disorder in the complex refractive index: Statistics of fluctuations

et al. 2000

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The probability distribution of the reflection coefficient for light reflected from a one-dimensional random amplifying medium with cross-correlated spatial disorder in the real and the imaginary parts of the refractive index is derived using the method of invariant imbedding. The statistics of fluctuations have been obtained for both the correlated telegraph noise and the Gaussian white-noise models for the disorder. In both cases, an enhanced backscattering (super-reflection with reflection coefficient greater than unity) results because of coherent feedback due to Anderson localization and coherent amplification in the medium. The results show that the effect of randomness in the imaginary part of the refractive index on localization and super-reflection is qualitatively different.Light propagation in disordered media and the associated Anderson localization of a wave in both the active as well as the passive random media 1-4 has been studied extensively. In recent years, there has been increased interest in light propagation and lasing in active random media supported by the several experiments carried out on these systems [5][6][7][8][9] . However the experimental findings of a narrowed spectral emission 5,9 and a pulse narrowing of the emission 6,8 above a well defined threshold of pumping could be explained merely as an effect of the long diffusive pathlengths in a random medium with gain and the consequent amplified spontaneous emission (ASE) 6,10 . More recently, the observed super-narrowing of the emitted spectra from strongly scattering semiconducting powder 11 and from weak scatterers dispersed in high gain organic media 12 has been attributed to coherent feedback caused by recurrent multiple scattering 13 . It is, however, still debatable if the wave amplification is due to the predicted synergy between wave confinement by Anderson localization and coherent amplification 2 .In all these studies, the active random medium is considered to scatter the propagating wave (light) due to fluctuations in the real part of the refractive index (η r ) (real potentials) while the coherent amplification is modelled by a phenomenological spatially constant imaginary part of the refractive index (η i ). However, it would be of interest to examine the effect of a spatially fluctuating imaginary part of the refractive index as well. More so, as the scattering micro-particles (e.g. polystyrene microspheres, T iO 2 rutile particles) used in the experiments are not active, a corresponding mismatch in the imaginary part of the refractive index is found to exist. It has been pointed out by Rubio and Kumar 14 that a mismatch in the imaginary part of the refractive index (imaginary potential) would always cause a concomitant reflection (scattering) in addition to the absorption or amplification. Mismatch in η i alone in an amplifying medium (negative imaginary potential) with no mismatch in η r can cause resonant enhancement of the scattering coefficients. In fact, the reflection and the transmission coefficients can even d...

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Microdroplet dye laser enhancing effects in dye-highly scattering intralipid mixture

Cited by 27 publications

References 3 publications

Cavity-Q-driven spectral shift in a cylindrical whispering-gallery-mode microcavity laser

Cavity-Q-driven spectral shift in a cylindrical whispering-gallery-mode microcavity laser

Hydrogel Microlasers for Versatile Biomolecular Analysis Based on a Lasing Microarray

Reflection of light from a random amplifying medium with disorder in the complex refractive index: Statistics of fluctuations

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