Linear arrays of 3 nm wide Fe stripes with 15 nm spacing are fabricated by self-assembly. They are formed by photolysis of ferrocene that is selectively adsorbed between CaF2 stripes. An ultraviolet nitrogen laser removes the organic ligands from ferrocene. Arrays of CaF2 stripes serve as masks, which are self-assembled on a stepped Si~111! surface. Scanning tunneling microscopy is used to inve...

We have developed a LiF/CaF2:Tb eutectic composite as novel thermoluminescence (TL) dosimetric material. The was obtained using melt-solidification method with lower melting temperature than that of LiF and CaF2. results the PL emission excitation spectra, X-ray induced radioluminescence decay curve, TL spectrum indicate emissions are due to 4f-4f transitions Tb3+ ion. integrated intensity 3.6 ...

We applied a 0.3 mJ, 1.7 ns, 46.9 nm soft-x-ray argon laser to ablate the surface of large bandgap dielectrics: CaF2 and LiF crystals. We studied the ablation versus the fluence of the soft-x-ray beam, varying the fluence in the range 0.05-3 J/cm2. Ablation thresholds of 0.06 and 0.1 J/cm2 and ablation depths of 14 and 20 nm were found for CaF2 and LiF, respectively. These results define new ab...

We demonstrate efficient Raman lasing with CaF2 whispering-gallery-mode resonators. Continuous-wave emission threshold is shown to be possible below 1 microW with a 5mm cavity, which is to our knowledge orders of magnitude lower than in any other Raman source. Low-threshold lasing is made possible by the ultrahigh optical quality factor of the cavity, of the order of Q=5x10(10). Stokes componen...

—The surface energies, tensions and structures of the (111) and (110) surfaces of CaF2 , SrF2, BaF2 and U 0 2 , Th0 2 , Pr0 2 , Pu0 2 , Ce0 2 have been calculated using an ionic shell model. The surface energies for the natural cleavage plane (111) are compared with the available experimental data and agree well. The surface tensions indicate a compressive stress in both surfaces. The surface s...

Results of diode-pumped cw laser operation of an Yb3+:CaF2 single crystal are reported for what is to our knowledge the first time. With a 5-at.% Yb3+ -doped sample we obtained 5.8-W output power at 1053 nm for 15 W of incident power at 980 nm. The laser wavelength could be tuned from 1018 to 1072 nm, and a small-signal gain as high as 1.8 was achieved, showing the great potential of Yb3+:CaF2 ...

Fluoride galvanic cells employing CaF2 as electrolyte have not been as extensively employed for thermodynamic characterization of alloys and compounds as the oxide electrolyte cells based on stabilized zirconia. However, CaF 2 galvanic cells have many advantages over oxide electrolyte cells. These advantages, as well as the factors affecting the proper functioning of the CaF2 cells, are discuss...

The Gas Metal Arc welding process was used to prepare single-track and multilayer samples. effects of CaF2 TiO2 on the penetration width depth samples are studied. results show that addition these two active agents will reduce surface morphology quality single-track, but it deepen single-track. Compared with sample CaF2, can maintain a better single track while increasing penetration. ratio eff...