Temperature-dependent wavelength shifts of dye lasing in microdroplets with a thermochromic additive

Mazumder, Md. Mohiuddin; Chen, G.; Kindlmann, P. J.; Chang, Richard K.; Gillespie, James B.

doi:10.1364/ol.20.001668

Cited by 16 publications

(14 citation statements)

References 9 publications

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“…The order of magnitude is consistent with the experimental observations summarized in Fig.10a. A similar effect was reported using absorbers in micro-droplets [62,63]. In other words, the envelope of the lasing spectrum is blue-shifted, when the quality factor of the resonator decreases [26].…”

Section: Spectral Featuressupporting

confidence: 75%

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Gain properties of dye-doped polymer thin films

et al. 2015

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Hybrid pumping appears as a promising compromise in order to reach the much coveted goal of an electrically pumped organic laser. In such configuration the organic material is optically pumped by an electrically pumped inorganic device on chip. This engineering solution requires therefore an optimization of the organic gain medium under optical pumping. Here, we report a detailed study of the gain features of dye-doped polymer thin films. In particular we introduce the gain efficiency K, in order to facilitate comparison between different materials and experimental conditions. The gain efficiency was measured with various setups (pump-probe amplification, variable stripe length method, laser thresholds) in order to study several factors which modify the actual gain of a layer, namely the confinement factor, the pump polarization, the molecular anisotropy, and the re-absorption. For instance, for a 600 nm thick 5 wt% DCM doped PMMA layer, the different experimental approaches give a consistent value K ≃ 80 cm.MW −1 . On the contrary, the usual model predicting the gain from the characteristics of the material leads to an overestimation by two orders of magnitude, which raises a serious problem in the design of actual devices. In this context, we demonstrate the feasibility to infer the gain efficiency from the laser threshold of well-calibrated devices. Besides, temporal measurements at the picosecond scale were carried out to support the analysis.

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Section: Spectral Featuressupporting

confidence: 75%

“…Hence, the ratio of molecules γ(λ) = N * th /N that must be excited to reach the threshold depends on re-absorption [38,62]:…”

Section: Spectral Featuresmentioning

confidence: 99%

Gain properties of dye-doped polymer thin films

et al. 2015

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“…27 Lasing spectra from droplets (diameter 70 lm) made of 85 % isopropanol and 15 % water seeded with 5.10 -4 mol/L rhodamine B and CoCl 2 ÁH 2 O for different temperatures. Reprinted from Mazumder et al (1995b) combustion engines, appropriate inorganic phosphors can operate at temperatures up to 2,000 K and it is also commonly accepted that their luminescence properties are almost independent of pressure (Aldén et al 2011). Thermographic phosphors are usually in the form of a fine powder (typically ranging from 1 to 10 lm).…”

Section: Thermographic Phosphorsmentioning

confidence: 99%

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

2013

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“…The absorption loss a a b, may depend on temperature (T), as is the case with a thermochromic additive which we use for temperature determination. 71 At a MDR wavelength, ai ea j." 9e = , and a a t, = , where m is the refractive index of the droplet, and Q 0 is the quality factor of the MDR.…”

Section: Dye Lasing In Microdropletsmentioning

confidence: 99%

“…Here we discuss a method which may prove useful for determining droplet temperature. 71 In this method the droplets are doped with a laser dye and a thermochromic substance (i.e., a material with a temperature-dependent absorption spectrum). Then, as the temperature of a. droplet changes, the absorption spectrum of the thermochromic substance changes, which thereby changes the Q's of the MDRs at different wavelengths.…”

Section: Temperature Determination From Absorption-induced Q-degradationmentioning

confidence: 99%

Optical Resonances of a Spherical Dielectric Microcavity: Effects of Perturbations

Mazumder¹,

Chowdhury²,

Hill³

et al. 1996

Optical Processes in Microcavities

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The resonances of a dielectric microsphere (morphology-dependent resonances (MDR's), whispering gallery modes, or quasinormal modes) have extremely large (>10 6 ) quality factors (Q's) even when the sphere is as small as a few wavelengths. Perturbations in the refractive index or the shape of a microsphere shift the resonance frequencies and change the Q's from those of the unperturbed sphere. Here we develop an effective-average model to compute the first-order perturbation-induced changes in the resonance frequencies and the Q's of the MDR's. Near or on a resonance, a modified definition of mode volume is used to approximate the microsphere as a closed cavity. Analogous to the modal gain or loss in a waveguide cavity, an effective-average modal gain or loss in an inhomogeneous microsphere is defined. Both the effective-average and a time-independent perturbation theory are used to model optical bistability in a dielectric microsphere. Dispersive and absorptive optical bistability result from intensity-dependent perturbations in the real and the imaginary part of the refractive index, respectively. The effect of perturbations (e.g., size changes, shape deformations, and temperature-dependent absorption) on the dye-lasing spectra from liquid microdroplets are discussed. We show that perturbation effects can be used to develop optical diagnostics for the determination of droplet properties such as evaporation rate, shape deformation, surface tension, and temperature.

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Temperature-dependent wavelength shifts of dye lasing in microdroplets with a thermochromic additive

Cited by 16 publications

References 9 publications

Gain properties of dye-doped polymer thin films

Gain properties of dye-doped polymer thin films

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

Optical Resonances of a Spherical Dielectric Microcavity: Effects of Perturbations

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