Compressed-Gas Lasers

Basov, N G; Belenov, É. M.; Danilychev, V. A.; Suchkov, A. F.

doi:10.1070/pu1974v016n04abeh005304

Cited by 8 publications

(6 citation statements)

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“…1,6,7,10,11 The capillary macro-oscillations of melt pool bulk are reported in literature. [12][13][14] These calculations are in a good agreement with the experimental data. However, they do not reveal the excitation mechanisms of oscillations.…”

Section: Introductionsupporting

confidence: 81%

Hydrodynamical phenomena in the process of laser welding and cutting

Kumar

Dash

Tyagi³

et al. 2007

Science and Technology of Welding and Joining

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The main objective of the paper is to outline the 'bridges' existing between the outcomes of fundamental researches and the results of investigations in the field of industrial laser materials processing (LMP). An analysis is presented on the models based on non-stationary hydrodynamic phenomena caused by deeply penetrating high power CW laser beam into materials. This is typical of laser welding (LW) and laser cutting (LC). A physical analysis pertaining to melt removal and melt layer instability mechanisms of gas jet assisted CW-CO 2 laser fusion cutting is presented. The models deliberated here are melt squeezing out by gas pressure gradient, melt dragging by the friction force between melt surface and gas flow, formation of moving shelves at the cutting front. In case of high laser intensity, radiative flux interacts with material causing dynamical thermal transport onto the surface and phase transition at solidliquid-gas interfaces. The solution is based on the non-stationary variables. Under these conditions the Mach number varies significantly due to laser intensity associated with laser flux energy instabilities. The connection among material surface temperature, laser intensity, laser flux and pressure in the plasma cloud is brought out. In addition, novel mechanisms based on hydrodynamics are proposed.

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Section: Introductionsupporting

confidence: 81%

Hydrodynamical phenomena in the process of laser welding and cutting

Kumar

Dash

Tyagi³

et al. 2007

Science and Technology of Welding and Joining

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“…In an absorber (amplifier) the group velocity is 'abnormal' (normal) at the frequency at which the absorption (amplification) is greatest. Basov et al [25] demonstrated that the group velocity of a laser pulse in an amplifier could exceed c due to a pulse reshaping in which the front part of the pulse leaves less gain available for the back part, resulting in an advancement of the peak of the pulse. Icsevgi and Lamb [26] argued that Basov et al in their analysis assumed 'an unphysical input pulse extending to infinity at both ends'.…”

Section: Superluminal Group Velocitiesmentioning

confidence: 99%

Controlling the speed of light pulses

Milonni

2002

J. Phys. B: At. Mol. Opt. Phys.

116

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“…The nonlinear properties of ion-doped materials also play an important role in the study of slow and fast light [3]. In 1966, Basov et al performed experiments in ruby that motivated a discussion about fast light in amplifiers [4]. More recently, slow and fast light were observed in ruby and alexandrite absorbers [5], based on the effect of coherent population oscillations (CPO).…”

mentioning

confidence: 97%

Discrimination of Resonant and Nonresonant Contributions to the Nonlinear Refraction Spectroscopy of Ion-Doped Solids

Lima

Catunda

2007

Phys. Rev. Lett.

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Nonlinear refraction spectroscopy measurements were performed in resonance with absorption lines in Nd3+ and Cr3+ doped crystals. The observed line shapes can be explained by the interference of resonant and nonresonant contributions to the nonlinear refractive index. These effects were fully discriminated using a pump and probe configuration, in which a dispersive line shape was observed on the top of a plateau that was attributed to the polarizability difference between excited and ground states (Deltaalpha). A theoretical model was used to obtain Deltaalpha from the experimental data, and the results are in agreement with several previous experiments. Slow and fast light propagation are also discussed.

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Compressed-Gas Lasers

Cited by 8 publications

References 0 publications

Hydrodynamical phenomena in the process of laser welding and cutting

Hydrodynamical phenomena in the process of laser welding and cutting

Controlling the speed of light pulses

Discrimination of Resonant and Nonresonant Contributions to the Nonlinear Refraction Spectroscopy of Ion-Doped Solids

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