1,720,995 research outputs found
Diode-pumped ion-implanted crystal waveguide laser
No full textWe have recently reported the use of ion-implantation to form planar waveguide lasers in Nd:YAG crystals. Here, for the first time, we report diode pumped operation using a 500 mW diode array. We also describe the use of ion implantation to form planar waveguide lasers in Nd:YAP and Nd:MgO:LiNbO3
An efficient, diode-pumping, ion-implanted Nd:GGG Planar waveguide laser
No full textWe report the first laser operation of an ion-implanted Nd:GGG planar waveguide laser at 1.062µm. Diode array and dye-laser pumping is described with threshold absorbed powers as low as 8mW. Slope efficiencies of 30% with respect to absorbed power have been observed with output powers of up to 40mW
Ion-implanted Nd:GGG channel waveguide laser
Full text linkWe report what is to our knowledge the first fabrication and laser operation of ion-implanted Nd:GGG channel waveguides. Diode-pumped operation has been achieved with absorbed power thresholds as low as ~2 mW and a slope efficiency of ~30% with respect to absorbed power
A side-pumped Nd:YAG epitaxial waveguide laser
No full textWe report the first operation of a side-pumped crystal waveguide laser. Both diode array and dye laser side-pumping of an epitaxially grown Nd:YAG planar waveguide laser have been demonstrated, with thresholds as low as 8 mW observed for a simple plane mirror cavity. Output slope efficiencies of 19% have also been demonstrated. The threshold and slope efficiency of this system is found to be in good agreement with a simple analytical model
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Channel waveguide laser at 1µm in Yb-indiffused LiNbO3
No full textWe report laser action in a Ti-diffused LiNbO3 waveguide doped with trivalent Yb ions by thermal indiffusion. Lasing was observed at 1008, 1030, and 1060 nm with thresholds as low as 15-mW launched pump power. We reduced photorefractivity, which initially permitted only intermittent lasing, by annealing the sample in wet O2. The annealed sample lased continuously in a cavity formed by high-reflectivity mirrors; however, with a 7% output coupler the output power exhibited instabilities. The greatest value of the output power observed under these conditions was consistent with a slope efficiency of ~16% with respect to absorbed power
A low threshold epitaxially grown Nd:YAG waveguide laser operating at 946nm
No full textThe 946-mn transition of Nd:YAG has attracted interest asa possible source of diode- pumped blue light (after frequency doubling). A problem with this transition, however, is its three-level nature, with 0.7% of the total Nd population residing in the lower laser level at room temperature. Moving to a waveguide geometry gives the advantage of better light confinement, which should lead to significantly lower thresholds even despite some added propagation loss introduced by the guide
Low threshold ion-implanted Nd:YAG channel waveguide laser
No full textThe first channel waveguide laser in Nd:YAG showing a threshold reduction of 20 times compared to a planar waveguide is described. With diode pumping this ion-implanted waveguide laser has been operated with absorbed power thresholds as low as ~500µW in good agreement with theoretical expectation. Output slope efficiencies of ~29% have also been demonstrated
Ion implanted quasi-three-level Yb:YAG waveguide lasers
No full textYb:YAG has manv advantages compared to the widely used Nd:YAG system. These include closer pump and laser wavelengths, leading to a more efficient transfer of energy from the pump to laser photons and less thermal loading of the gain medium. Excited state absorption, upconversion, and concentration quenching are also reduced because of the fact that there is only one excited 4f manifold. Efficient, room-temperature operation of a bulk Yb:YAG laser at 1.03 µm has recently been reported showing that the broad absorption bands are well suited to diode pumping
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