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The transmission of a laser beam through a tapered glass capillary was investigated both experimentally and theoretically for light microbeams. The transmittances of laser light at 488 and 633 nm through capillaries were measured to be up to 15%, depending on the outlet diameter. By characterizing a real capillary with precise measurement of the whole capillary geometry, a realistic simulation allowed us to calculate the transmittance. By using a Gaussian profile as the input beam in a simulation, the calculated transmittances well reproduced the experimental ones. The density enhancement of the extracted beam was derived and discussed. [ABSTRACT FROM AUTHOR]

High-resolution atomic-beam diode-laser spectroscopy in Sm I has been performed. Zeeman spectra have been measured for the hree optical transitions at different external magnetic fields and well resolved at the magnetic fields of stronger than 6.0 mT. Using he known precise Landérs of the groundmultiplet, the Landé g-factors of the upper 4f66s6p 9F1 and 9D3levels have been determined, and their precision has been improved compared with the reference values. [ABSTRACT FROM AUTHOR]

High-resolution atomic-beam ultraviolet (UV) laser spectroscopy in Dy I and Er I has been performed. Isotope shifts have been measured for two transitions in Dy I and one transition in Er I. Specific mass shifts and field shifts have been derived for the studied transitions, and large differences between the two 4 f 106s²-4 f 106s6p transitions in Dy I have been found. From the derived specific mass shifts and field shifts, configuration mixing at the upper levels of transitions has been discussed. [ABSTRACT FROM AUTHOR]