Topic
Nd:YAG laser
About: Nd:YAG laser is a research topic. Over the lifetime, 6937 publications have been published within this topic receiving 90983 citations. The topic is also known as: neodymium-doped yttrium aluminum garnet laser.
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TL;DR: The frequency-doubled light generated in the glass fibers was sufficient to pump a commercial Rh6G dye laser with ~19% efficiency at 570 nm.
Abstract: Efficient frequency doubling of a cw Q-switched and mode-locked Nd:YAG laser has been observed in commercial single-mode optical glass fibers. Pulses of duration ~55 psec and intensities as high as ~0.55 kW were produced at 0.53 μm. The maximum peak power-conversion efficiency measured was ~3%. The frequency-doubled light generated in the glass fibers was sufficient to pump a commercial Rh6G dye laser with ~19% efficiency at 570 nm.
560 citations
TL;DR: In this article, a model for an end-pumped quasi-three-level laser with population in the lower laser level at equilibrium was developed for transitions to the manifolds4I 9/2 in Nd3+,4I 15/2 and 3H 6 in Tm3+.
Abstract: A model is developed for an end-pumped quasi-three-level laser with population in the lower laser level at equilibrium such as for transitions to the manifolds4I 9/2 in Nd3+,4I 15/2 in Er3+,5I 8 in Ho3+and3H 6 in Tm3+. It is shown that the effect of residual lower laser level population on laser operation can be treated as a saturable loss. Room temperature operation on the4F 3/2 -4I 9/2 transition in Nd:YAG under CW dye laser pumping has been demonstrated with a threshold as low as 11.5 mW incident power and a slope efficiency of 7 percent with 0.3 percent output coupling. Performance is limited by the low output coupling and diffraction loss.
399 citations
TL;DR: In this article, a numerical simulation of the heat flow equation has been performed and compared with experimentally obtained titanium plates, which allowed to obtain a process map of the sintering process.
Abstract: To understand the process of pulsed selective laser sintering, two different energy coupling mechanisms have to be considered. In a first step, the energy is absorbed in a narrow layer of individual powder grains determined by the bulk properties of the material. This leads to a high temperature of the surface of the grains during the interaction. After thermalization of the energy, heat flows mainly towards the center of the grains until a local steady state of the temperature within the powder grain is obtained. Afterwards, the surrounding powder properties have to be considered for the further thermal development. According to these model assumptions, a numerical simulation of the heat flow equation has been performed and compared with experimentally obtained titanium plates, which allowed to obtain a process map.
332 citations
TL;DR: In this article, double and multiple Q-switch Nd:YAG laser pulses are used to vaporize material from solid steel samples and to induce a plasma, and the material ablation of different pulse bursts, emission intensities of iron lines and electron temperatures and densities are determined.
Abstract: Single, double and multiple Q-switch Nd:YAG laser pulses are used to vaporize material from solid steel samples and to induce a plasma. The material ablation of different pulse bursts, emission intensities of iron lines and electron temperatures and densities are determined. Material ablation is found to increase with multiple pulses compared to single pulses of fixed total energy as well as electron temperatures and densities. Line intensities can be increased by a factor of about two using double pulses. Quantitative microchemical analysis of low-alloy steel is performed with single and double pulses. The analytical performance is improved by the double-pulse technique.
308 citations
TL;DR: The results reveal that a Nd: YAG rod under pumped light becomes a positive lens with two focal lengths, and the temperature dependent variation of the refractive index constitutes the major contribution of the thermal lensing.
Abstract: Theoretical and experimental results are reported on the thermal lensing effect caused by the radial thermal gradient present in optically pumped Nd:YAG laser rods. The presented theory is in agreement with the experimental observations. The results reveal that a Nd: YAG rod under pumped light becomes a positive lens with two focal lengths. The temperature dependent variation of the refractive index constitutes the major contribution of the thermal lensing. The stress dependent variation of the refractive index modifies the focal length about 20%. The effect of end-face curvature caused by an elongation of the rod is less than 6%.
305 citations