3,193 research outputs found
Detection of early infections of eel herpesvirus in Formosa (EHVF) in eels using polymerase chain reaction.
No full textPrevalence of Pediculus capitulus infestation among school children of Chinese refugees residing in mountainous areas of northern Thailand.
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A study on the electrochromic properties of polyaniline/silica composite films with an enhanced optical contrast
No full textCw ion lasers pumped by electron beams
Full text linkWe have obtained cw laser radiation from singly ionized Hg, I, Cd, Se, and As by exciting He metal-vapor mixtures with a dc electron beam. The beam is generated by glow discharge electron guns located apart from the active medium. This is the first time that cw ion laser action has been obtained using electron beam excitation
CW laser action in atomic fluorine
Full text linkWe have obtained CW laser action on four transitions in the doublet system of atomic fluorine for the first time. All previously reported laser action was on a pulsed basis only. CW laser radiation was obtained when F2 or AgF was used as a fluorine donor in an electron beam pumped helium plasma. A multiline output power of 200 mW was obtained
CW silver ion laser with electron beam excitation
Full text linkA CW laser power of 140 mW was obtained in the 840.39 nm transition of Ag II by electron beam excitation. This electron beam excited metal vapor ion laser is capable of operating using metals with high vaporization temperatures and is of interest for generation of CW coherent radiation in the 220-260 nm spectral region
1-W cw Zn ion laser
Full text linkWe have obtained 1.2W of cw laser power on the 4911.6- and 4924.0-Å transitions of Zn II by exciting a He-Zn gas mixture with a dc glow discharge electron beam. In addition, 0.25-W output power has been obtained on the 6149.9-Å line of Hg+ using the same excitation scheme. The combination of electron beam ionization of rare gas atoms and subsequent charge transfer excitation to metal ion levels is shown to have the potential of significantly increasing the efficiency of ion lasers. cw multiwatt visible and ultraviolet ion lasers operating at efficiencies > 10-3 appear feasible using this excitation scheme
A coupled-cavity mini-array VCSEL for CW THz generation
Full text linkIn this paper, a 2x1 mini-array VCSEL is studied as a source of CW THz radiation. The frequency of the signal can be tuned by current up to 9.5mA, at which the laser features optical beatings up to 300GHz, which are converted to corresponding THz frequencies by photomixing. The influences of the laser current on the optical spectrum of the laser, and thus on the THz signal are also investigated. With its simpleness, compactness and extremely low cost, the mini-array VCSEL has the potential to replace other laser sources to promote CW THz applications in industry
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