High efficiency room temperature laser emission in heavily doped Yb:YLF

We report the tunable, CW and quasi CW laser operation at room temperature of an highly doped (30% at.) Yb:YLF crystal longitudinally pumped by a fiber coupled laser diode array. The CW output power is 1.15 W vs. an absorbed pump power of 6 W, with a slope efficiency of 31%. In quasi-CW operation (20% duty factor @10 Hz) an output power of 4 W with an absorbed power of 9.5 W, and a slope efficiency of 62.8% were obtained. The tuning range spans from 1022 to 1075 nm. To our knowledge, these are among the best experimental results obtained at room temperature with Yb doped YLF

Diode-pumped Pr:BaY2F8 cw orange laser

We report the realization of the continuous wave laser emission in the orange at 607 nm from a Pr:BaY2F8 (Pr:BYF) crystal pumped by a blue GaN laser diode. A maximal output power of 78 mW is obtained in a quasi single transverse mode beam. The effect of reabsorption losses at the laser wavelength is also evidencedComment: accepted for publication in Optics Letter

Nuclear architecture organized by Rif1 underpins the replication-timing program

DNA replication is temporally and spatially organized in all eukaryotes, yet the molecular control and biological function of the replication-timing program are unclear. Rif1 is required for normal genome-wide regulation of replication timing, but its molecular function is poorly understood. Here we show that in mouse embryonic stem cells, Rif1 coats late-replicating domains and, with Lamin B1, identifies most of the late-replicating genome. Rif1 is an essential determinant of replication timing of non-Lamin B1-bound late domains. We further demonstrate that Rif1 defines and restricts the interactions between replication-timing domains during the G1 phase, thereby revealing a function of Rif1 as organizer of nuclear architecture. Rif1 loss affects both number and replication-timing specificity of the interactions between replication-timing domains. In addition, during the S phase, Rif1 ensures that replication of interacting domains is temporally coordinated. In summary, our study identifies Rif1 as the molecular link between nuclear architecture and replication-timing establishment in mammals

Visible laser emission of solid state pumped LiLuF 4 :Pr 3+

In the present work we report on the growth, spectroscopy and laser results of LiLuF(4):Pr(3+) 1.25% in the melt. Room temperature polarized absorption and emission spectra have been recorded and the decay time of the (3)P0 manifold has been measured. Finally efficient room temperature laser emission have been obtained at 522.8 nm, 607.25 nm, 640.17 nm and 721.5 nm under 480 nm pumping by means of an optically pumped semiconductor laser

Economic Inequality: A Blog About Economic Inequality in North America

This project takes on a blog format to illustrate economic inequality in North America.https://digitalcommons.butler.edu/freedom-movement-fall-2018/1006/thumbnail.jp

Tm-doped LiLuF4 crystal for efficient laser action in the wavelength range from 1.82 to 2.06 mu m

Room-temperature continuous-wave laser action in a novel Tm-doped LiLuF4 crystal emitting at around 1.9 mu m is demonstrated. The crystal growth process, spectroscopic measurements, and laser performance are presented for different Tin concentrations. An overall tunability extending from 1817 to 2056 nm, a slope efficiency of 46%, and a maximum output power in excess of 1.1 W are reported. (C) 2007 Optical Society of America

High efficiency room temperature laser emission in heavily doped Yb : YLF

We report the tunable, CW and quasi CW laser operation at room temperature of an highly doped (30% at.) Yb:YLF crystal longitudinally pumped by a fiber coupled laser diode array. The CW output power is 1.15 W vs. an absorbed pump power of 6 W, with a slope efficiency of 31%. In quasi-CW operation (20% duty factor @10 Hz) an output power of 4 W with an absorbed power of 9.5 W, and a slope efficiency of 62.8% were obtained. The tuning range spans from 1022 to 1075 nm. To our knowledge, these are among the best experimental results obtained at room temperature with Yb doped YLF. (C) 2007 Optical Society of America

Purification of Wastewater from Biomass-Derived Syngas Scrubber Using Biochar and Activated Carbons

Phenol is a major component in the scrubber wastewater used for syngas purification in biomass-based gasification plants. Adsorption is a common strategy for wastewater purification, and carbon materials, such as activated carbons and biochar, may be used for its remediation. In this work, we compare the adsorption behavior towards phenol of two biochar samples, produced by pyrolysis and gasification of lignocellulose biomass, with two commercial activated carbons. Obtained data were also used to assess the effect of textural properties (i.e., surface area) on phenol removal. Continuous tests in lab-scale columns were also carried out and the obtained data were processed with literature models in order to obtain design parameters for scale-up. Results clearly indicate the superiority of activated carbons due to the higher pore volume, although biomass-derived char may be more suitable from an economic and environmental point of view. The phenol adsorption capacity increases from about 65 m/g for gasification biochar to about 270 mg/g for the commercial activated carbon. Correspondingly, service time of commercial activated carbons was found to be about six times higher than that of gasification biochar. Finally, results indicate that phenol may be used as a model for characterizing the adsorption capacity of the investigated carbon materials, but in the case of real waste water the carbon usage rate should be considered at least 1.5 times higher than that calculated for phenol

DNA replication timing alterations identify common markers between distinct progeroid diseases

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