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Optical vortices, having doughnut-shaped spatial profile with zero intensity around the phase singularity, are of great interest due to its wide range of applications in variety of fields in science and technology. Two spatially separated entwined vortices with opposite topological charge forms a vortex dipoles. Due to their entwining nature, the vortex dipoles are created and annihilated in pairs...
Trivalent praseodymium doped materials are the most established gain media for solid-state lasers with direct visible emission. The progress in blue InGaN laser diodes (LD) and frequency doubled optically pumped semiconductor lasers (2ω-OPSL) enables efficient pumping of Pr3+-doped materials and efficient laser operation was realized in the cyan, green, orange, red and deep red parts of the optical...
The thin disk-shaped active medium is a very thin laser crystal with one face mounted on a heat sink. The large cooled-surface-to-active-volume ratio avoids thermal problems occurring in conventional high power rod or slab lasers and enables high power TEM00 operation. However, the absorption of pump light in the thin disk crystal for single pass is very small in the end-pumped configuration. A classical...
Research on praseodymium-doped solid-state lasers is seeing a renovated interest in the last years. Among the best crystal hosts for these lasers, BaY2F8 (BYF) shows some peculiarities, such as its monoclinic structure and its wide Stark splitting, which allow enhanced power scalability and broad tunability. However, BYF is considered troublesome to grow, and sometimes can crack during handling. To...
For rapid wavelength tuning in optical parametric oscillators (OPOs), a mandatary requirement for many applications including spectroscopy and trace gas sensing, the use of crystals with fan-out grating design at a fixed temperature has been a potential approach, as it is a fast process compared to temperature tuning. In the continuous-wave (cw) regime, this technique has been successfully deployed...
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