Simulation and fabrication of 3D printed optical planar multimode 1x2Y splitters

This paper reports about design and simulation of planar optical multimodal splitters in combination with plastic optical fibers for the visible spectrum. These devices consisted of Veroclear RGD810 core and Polydimethylsiloxane PDMS substrate/cladding. The splitters were simulated by the beam propagation method using RSoft software and by using a ray tracing method used OptiCAD software. The simulations were done for the width of waveguide core 750 µm. The core was manufactured by 3D printer Stratasys Objet 30 Pro. Estimation of total excess loss was discussed using waveguide loss theory. Material constants were measured. Both - extrinsic and intrinsic factors were defined and used for this estimation. And the final model is presented. The values of optical insertion loss were simulated at 650 nm and compared to values measured

A MULTI-TECHNIQUE CHARACTERIZATION OF CRONSTEDTITE SYNTHESIZED BY IRON-CLAY INTERACTION IN A STEP-BY-STEP COOLING PROCEDURE

International audienceThe cooling of steel containers in radioactive-waste storage was simulated in a step-by-step experiment from 90 to 40 degrees C. Among newly formed clay minerals observed in run products, cronstedtite was identified by a number of analytical techniques (powder X-ray diffraction, transmission electron microscopy, and scanning electron microscopy). Cronstedtite has not previously been recognized to be so abundant and so well crystallized in an iron-clay interaction experiment. The supersaturation of experimental solutions with respect to cronstedtite was due to the availability of Fe and Si in solution, as a result of the dissolution of iron metal powder, quartz, and minor amounts of other silicates. Cronstedtite crystals are characterized by various morphologies: pyramidal (truncated or not) with a triangular base and conical with a rounded or hexagonal cross-section. The pyramidal crystals occur more frequently and their polytypes (2M(1), 1M, 3T) were identified by selected area electron diffraction patterns and by automated diffraction tomography. Cronstedtite is stable within the 90-60 degrees C temperature range. At temperatures of <= 50 degrees C, the cronstedite crystals showed evidence of alteration

Development of new mixed Lux(RE3+)1-xAP:Ce scintillators (RE3+ =Y3+ or Gd3+): Comparison with other Ce-doped or intrinsic scintillation crystals

This paper presents the development of new Ce-doped, fast and high effective-Z mixed Lux(RE3+)1-xAP:Ce crystals. These crystals have been grown by the Czochralski method and good results have been obtained with x = 0.1, 0.2 and 0.3 for Y3+ ions. Relative light yields measured for the Lux(RE3+)1-xAP:Ce crystals are 40% to 75% higher than for BGO and are comparable to the light yield of YAP:Ce crystal. Measured energy resolutions at 662 keV range over 8% to 15.3% FWHM and are close to the energy resolution obtained with a YAP:Ce. Thermally stimulated luminescence (TSL) measurements above room temperature have also been performed: in accordance with the expected effect of trap states on scintillation efficiency, an anticorrelation between TSL intensity and light yield is found