ASE and photostability measurements in dye doped step index, graded index and hollow polymer optical fiber

Peter, Jaison; Vallabhan, C. P. G.; Radhakrishnan, P.; Nampoori, V. P. N.; Kailasnath, M.

doi:10.1016/j.optlastec.2014.03.013

Cited by 21 publications

(6 citation statements)

References 20 publications

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“…In comparison to the pristine host system, the use of highly efficient acceptor materials leads to an enhancement of the quantum efficiency of the system [18,19]. In the context of lasers, efficient energy transfer between several donor–acceptor pairs has been reported to enhance the laser performance and to extend the spectral range of laser operation [20,21]. In donor–acceptor pairs, self-absorption is significantly reduced because the emission region is shifted away from absorption.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties and Amplified Spontaneous Emission of Novel MDMO-PPV/C500 Hybrid

2017

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Abstract:The influence of the solvent nature on optical properties of poly[2-methoxy-5-3,7-dimethyloctyloxy-1,4-phenylenevinylene] (MDMO-PPV)/Coumarine 500 (C500) have been investigated. In addition, the amplified spontaneous emission (ASE) from MDMO-PPV and efficient energy transfer between the MDMO-PPV and C500 has been verified. The MDMO-PPV was dissolved in aromatic and nonaromatic solvents, while the solution blending method was employed to prepare the MDMO-PPV:C500 hybrid. The quantum yield of the MDMO-PPV was found to increase with the reduction of a few factors such as polarity index of the solvent, absorption cross section (σ a ), emission cross section (σ e ), and extinction coefficient (ε max ). The fluorescence spectra of the MDMO-PPV appears from two vibronic band transitions (0-0, 0-1) and the ASE occurs at 0-1 transition, which was verified by the ASE from MDMO-PPV. The MDMO-PPV in toluene exhibited the best ASE efficiency due to its high quantum yield compared with other solvents. Strong overlap between the absorption spectrum of MDMO-PPV and emission spectrum of C500 confirmed the efficient energy transfer between them. Moreover, the ASE for energy transfer of the MDMO-PPV:C500 hybrid was proved.

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Section: Introductionmentioning

confidence: 99%

Optical Properties and Amplified Spontaneous Emission of Novel MDMO-PPV/C500 Hybrid

2017

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“…Spectral line narrowing as a function of pump power is the signature of light amplification. 22,23 The collapses of the full-width-half-maximum (FWHM) in the emission spectrum and the change in the slope in the output emission intensity are the indication of the onset of ASE above a certain threshold (P th ¼ 12 mW). Also, spectral narrowing from 52 to 5 nm is observed, when the pump power is increased to 15 mW above which no further line narrowing is observed due to gain saturation effect.…”

Section: Resultsmentioning

confidence: 99%

Angular dependent light emission from planar waveguides

Peter

Prabhu

Radhakrishnan

et al. 2015

Journal of Applied Physics

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We have investigated the angular dependence of amplified spontaneous emission (ASE) and laser emission from an asymmetric and free-standing polymer thin films doped with rhodamine 6G, which is transversely pumped by a pulsed Nd:YAG laser. A semi-leaky waveguide or quasi-waveguide structure has been developed by spin coating technique. In these waveguides, the light was confined by the film/air-film/glass substrate interfaces. At the film/substrate interface, a portion of light will reflect back into the film (guided mode) and the remaining refracted to the substrate resulting in cutoff modes. A blue-shift in ASE has been observed when the pump power was increased from 8 to 20 mW allowing a limited range of tuning of emission wavelength. To study the directionality of the ASE from the waveguide, we have measured the output intensity and FWHM of emission spectra as a function of viewing angle (θ) from the plane parallel to film. From the detailed examination of the output emission spectra, as +θ increases from 0° there has been an initial decrease in output intensity, but at a particular angle ≈10° an increase in output intensity was observed. This additional peak in output intensity as +θ is a clear indication of coexistence of the cutoff mode. We also present a compact solid-state laser based on leaky mode propagation from the dye-doped polymer free-standing film (∼50 μm thickness) waveguide. The partial reflections from the broad lateral surfaces of the free-standing films provided the optical feedback for the laser emission with high directionality. For a pump power of 22 mW, an intense line with FWHM <0.2 nm was observed at 578 nm.

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“…40,41 For instance, it is widely reported that aromatic dyes are generally dispersed in PS or doped into inert polymers to achieve high photostability. 42 However, the doping ratios of dyes are normally quite low (0.5−5 wt % in PS) to avoid concentration quenching of excitons. 43,44 Such a low doping strategy generally results in limited optical gain properties because of the low chromophore density that restricts the exciton density for population inversion.…”

Section: ■ Introductionmentioning

confidence: 99%

“…With introducing the steric hindrance groups, significant depression of π–π stacking can be obtained, which effectively prevents the intermolecular interactions . In our previous contributions, we have explored a novel series of starburst molecules typically composed of truxene or triazatruxene cores with varying oligofluorene arms, exhibiting superior lasing properties and thus manifesting great potentials for OSLs. ,,− Secondly, physical doping into inert matrix such as polystyrene (PS) and polymethyl methacrylate is another efficient strategy for regulating the intermolecular interactions. − Physical doping plays an important role to improve the morphological and photophysical stability. , For instance, it is widely reported that aromatic dyes are generally dispersed in PS or doped into inert polymers to achieve high photostability . However, the doping ratios of dyes are normally quite low (0.5–5 wt % in PS) to avoid concentration quenching of excitons. , Such a low doping strategy generally results in limited optical gain properties because of the low chromophore density that restricts the exciton density for population inversion.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Optical Gain Stability for a Deep-Blue Emitter Enabled by a Low-Loss Transparent Matrix

Pan

Xie

et al. 2018

J. Phys. Chem. C

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Efficient organic gain media with high optical gain and good photostability are highly desirable for organic semiconductor lasers. To shed light on the rational molecular design, in this work, a novel deep-blue organic emitter consisting of a carbazole core substituted by a diphenylamine-functionalized triazine unit and two arms of bifluorene with flexible alkyl chains (denoted as C2) was designed and synthesized. Various basic photophysics and amplified spontaneous emission (ASE) characterizations were conducted with a particular focus to unravel the impact of the molecular structure on the photostability. Relatively low ASE threshold of 7.0 μJ/cm 2 , high net gain coefficient of 79.9 cm −1 (under 40-fold threshold pump fluence), and low optical loss coefficient of 7.0 cm −1 were recorded for C2 in neat films. For comparison, C2 was also dispersed into polystyrene (PS), a low-loss transparent matrix, with various ratios to form PS-C2 blend films. Among them, a 50 wt % PS-C2 blend film exhibited a high gain coefficient of 61.8 cm −1 and a low-loss coefficient of 5.4 cm −1 , manifesting enhanced gain properties in comparison with that of pure C2 sample (52.2 and 7.0 cm −1 ) under identical pump conditions (10fold threshold pump fluence). With simple high-ratio blending, the photostability and the film morphology stability under annealing conditions were found to be significantly enhanced, giving rise to highly stable optical gain properties. The optical gain properties of the PS-C2 blend films remained almost unchanged even upon harsh annealing treatment in ambient atmosphere. The results suggest an efficient strategy to enhance the photostability of organic gain media without sacrificing the optical gain properties by combining the merits of robust gain media and a low-loss transparent matrix for achieving efficient and stable organic semiconductor lasers.

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ASE and photostability measurements in dye doped step index, graded index and hollow polymer optical fiber

Cited by 21 publications

References 20 publications

Optical Properties and Amplified Spontaneous Emission of Novel MDMO-PPV/C500 Hybrid

Optical Properties and Amplified Spontaneous Emission of Novel MDMO-PPV/C500 Hybrid

Angular dependent light emission from planar waveguides

Enhancing Optical Gain Stability for a Deep-Blue Emitter Enabled by a Low-Loss Transparent Matrix

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