Ruby laser

About: Ruby laser is a research topic. Over the lifetime, 2474 publications have been published within this topic receiving 38933 citations. The topic is also known as: corundum laser & ruby rod.

Kinetics of laser-initiated polymerization and molecular-weight distribution of the resultant polymer

Abstract: An expression is found for the function describing the molecular-weight distribution of a polymer formed by pulse-periodic initiation of polymerization. A study is made of the dependence of the molecular-weight distribution on the parameters of the initiating radiation. Experimental results are reported on the polymerization of methylmethacrylate under the influence of the second harmonic of a ruby laser. It is shown that the dependence of the reaction rate on the repetition frequency of the laser pulses and their energy is logarithmic. Viscometric measurements of the average molecular weight of the polymer samples are in satisfactory agreement with the theoretical predictions.

Pulsed laser processing of Ge/Se thin film structures

Abstract: The comparison between results of a systematic experimental study on Q-switched ruby laser processing of supported thin Ge/Se bilayer structures and model calculations permits us to unfold the rather complicated events into elementary steps. Depending on the sequence of the elemental layers and the absorbed fluence, compound synthesis, total or partial ablation of one of the constituents or the compound formed, and simultaneous transfer of the ablated material onto a separate substrate in close proximity is possible with a single laser pulse. The striking agreement between experimental findings and model calculations indicates the validity of the simple thermal model applied. The results establish a novel, inherently simple, single-step technique for local deposition of compound films from stacked elemental layers as a source onto any substrate.

Laser-induced breakdown of helium

Abstract: A theoretical investigation is made into the ionisation of helium, at pressures of 1800-17000 Torr (024-227 MPa) by ruby laser radiation of pulse-length 40 ns It is shown that, when the variation of electron energy gain in elastic collisions is taken into account, the agreement between computed and experimental breakdown threshold intensities is improved by a factor of 10 compared with calculations in which only the mean energy gain is computed The agreement is also improved significantly by incorporating the collisional and multiphoton ionisation of excited helium atoms

Laser-Induced Multiphoton Processes in e − − p Scattering

Abstract: In order to obtain information about the role of multiphoton processes in recently reported laser-induced nuclear fusion, the cross section for simultaneous net absorption of $n$ photons by a system of two point charges has been calculated numerically for ${e}^{\ensuremath{-}}\ensuremath{-}p$ scattering in a ruby laser beam at an incident relative energy of 100 eV. The results show that at laser intensities involved in fusion experiments multiphoton processes apparently play an important role, partly contributing to the same order within certain $n$ intervals.