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Abstract

Bragg grating reflectors placed along microcavity facets can improve the efficiency of a polymer dye laser built with such a microcavity. The impact of different reflector designs on the mode pattern and resonance frequencies of the microcavity is numerically simulated and analyzed. This rigorous physical model is based on solving the Maxwell equations and includes such material properties as absorption, dispersion, fluorescence and optical gain. In certain cases, an asymmetrical layout of the reflectors can be more preferable than the pair of reflectors located on opposite sides of the microcavity as it is implemented for typical design.

Abstract

The solid host of a laser dye modifies its spectroscopic properties with respect to its liquid host. During the Sol-Gel process the dye molecules suffer from changing their environment. Two parameters affect this matter, the change in the concentration due to the evaporation of the solvent (drying) and the caging of dye molecules inside the pores or attachment to the silica network. Rhodamine 6G absorption and fluorescence spectra with different concentrations, during Sol-Gel time processing, have been studied. Both, absorption and fluorescence spectra of the dye in the solid host, for different concentrations, show a blue-shift relative to its liquid phase.

Abstract

An improved approach for narrow-band wavelength selection in tunable lasers is described. To provide the tunability, a reconfigurable diffractive optical element (DOE) based on a programmable spatial light modulator (PSLM) is applied. With a proper choice of the phase transfer function of the PSLM, the device can be used as a dispersive intra-cavity component for precise tuning within the lasing spectral band of a solid-state dye laser. The suggested design allows avoiding the mechanical movement of any cavity components. The tunability performance and simulation are demonstrated using the Fourier optics method.

–6866. DOI: 10.1021/j100196a004. http://dx.doi.org/10.1021/j100196a004 [7] García-Moreno, I., Costela, A., Martin, V., Pintado-Sierra, M., & Sastre, R. (2009). Materials for a reliable solid-state dye laser at the red spectral edge. Advanced Functional Materials, 19, 2547–2552. DOI: 10.1002/adfm.200900112. http://dx.doi.org/10.1002/adfm.200900112 [8] Görner, H., & Gruen, H. (1985). Photophysical properties of quaternary salts of 4-dialkylamino-4′-azastilbenes and their quinolinium analogues in solution: IX. Journal of Photochemistry, 28, 329–350. DOI: 10

Appl Opt 2011 50 1816 21 [12] Ye L, Yin Z, Zhao C, et al. Thermally tunable random laser in dye-doped liquid crystals. J M Optic 2013;60:1607–11. 10.1080/09500340.2013.844867 Ye L Yin Z Zhao C Thermally tunable random laser in dye-doped liquid crystals J M Optic 2013 60 1607 11 [13] Ahmad M, Rahn MD, King TA. Singlet oxygen and dye-triplet-state quenching in solid-state dye lasers consisting of pyrromethene 567-doped poly(methyl methacrylate). Appl Opt 1999;38:6337–42. 10.1364/AO.38.006337 18324161 Ahmad M Rahn MD King TA Singlet oxygen and dye

(PMMA), polyethyleneglycol dimethacrylate 134 R. Reisfeld · Fluorescence-active Waveguides by the Sol-Gel Method (PEGDM), polyurethane (PU) and various epoxides have been also used as polymer hosts for solid state dye lasers [16]. List of common precursors for the preparation of optical materials 1) Tetraalkoxysilanes (general form: Si(OR)4): TEOS – Tetraethoxysilane, Si(OC2H5)4 TMOS – Tetramethoxysilane, Si(OCH3)4 2) Organoalkoxysilanes (general form: R′–Si–(OR)3): TMSPMA – 3-(Trimethoxysilyl)propylmethacrylate, C7H8O2–Si(OCH3)3 GLYMO – 3

attached on silica aerogel surface (surface modification) and the grafting through technique was applied to attach of polystyrene on the surface of silica aerogel [ 24 ]. Boday et al. have also prepared strong polycyanoacrylate/silica aerogel nanocomposites via chemical vapor deposition of cyanoacrylate monomers on amine-modified silica aerogels [ 25 ]. In addition, Costela at al. have applied polymer-filled nanoporous silica aerogel as hosts for highly stable solid-state dye lasers [ 26 ]. In this study, hydrophilic silica aerogel nanoparticles were modified with

surface of silica aerogel [31]. Chen-Yang et al. have investigated the effect of silica aerogel on the properties of polyethylene oxide-based nanocomposites [32]. Boday et al. have also prepared strong polycyanoacrylate/silica aerogel nanocomposites via chemical vapor de- position of cyanoacrylate monomers on amine-modified silica aerogels [33]. In addition, Costela at al. have applied polymer-filled nanoporous silica aerogel as hosts for highly stable solid-state dye lasers [34]. In this study, synthesis and characterization of silica aerogel nanoparticles was

[ 32 ]. In addition, Costela et al. have applied polymer-filled nanoporous silica aerogel as hosts for highly stable solid-state dye lasers [ 33 ]. Different initiation techniques of ATRP such as reverse atom transfer radical polymerization (RATRP) and activators generated by electron transfer ATRP (AGET ATRP) for random copolymerization of styrene and methyl methacrylate in the presence of clay nano-platelets and also simultaneous reverse and normal initiation technique for atom transfer radical copolymerization (SR&NI ATRP) of styrene and butyl acrylate in the