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Author s : Serban Georgescu; Voicu Lupei ; Claudiu Hapenciuc Show Abstract A mathematical model, based exclusively on spectroscopic data concerning radiative, non-radiative, and energy transfer processes, is proposed and used to simulate the Q-switch regime of three-micron Er:YAG laser.
The radiative as well as non- radiative losses during optical pumping and giant pulse generation are defined and evaluated. The reasons responsible for experimental performances of Q-switched Er:YAG lasers inferior to those predicted by the mathematical modeling are analyzed.
Author s : Valerica Ninulescu; Paul E. Sterian; Mihaela A. Ghelmez ; Mihai C. Piscureanu Show Abstract The work addresses the problem of a CO2 laser dynamics control in the presence of Gaussian white noise in the cavity losses.
We improve the delayed continuous feedback method by introducing memory of the previous states. The method proves a powerful one that works for otherwise chaotic dynamics and regular dynamics equally well and it is robust with respect to noise.
Sporea ; Clementina A. Timus Show Abstract The paper describes the methods used to adapt an industrial TEA- CO2 laser to the requirements of the ISO standard 11 for a laser induced damage threshold experimental facility.
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The goals were to improve the pulse energy stability and the laser beam spatial profile and the methods were: 1 finding the best discharge voltage; 2 adapting the laser cavity, 3 using suitable apertures. There is also presented the experimental set- up for beam characterization, which included a laser beam profiler a line of 60 pyroelectric detectorsan energy-meter to monitor the pulse energies and KCl optical components for beam splitting and beam guiding.
Every beam distribution was regarded as a linear combination of normalized Gauss-Hermite functions and the fitting algorithm allows the calculation of the coefficients of this combination. Author s : Niculae N. Puscas ; R. The simulations show the evolution of the above mentioned parameters under various pumping regimes.
In corp slim s pantip present work we demonstrated that high gains and low noise figures are achievable in high pump regimes and double pass configuration. Author s : Nicolaie A. Pavel; Takunori Taira ; M. Using M2 factor to describe the multimode pump beam's propagation from the broad-emission-area diode-laser the coupling optics was designed to obtain a high value for the mode-matching efficiency.
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A maximum slope efficiency of eta s equals Author s : V. Stancalie; Alain Sureau; V. Burke Show Abstract Within the framework of x-ray laser research using the recombination of heliumlike ions with free electrons to produce lithiumlike ions in expanding and cooling hot plasmas, we present a set of spectroscopic data required to improve the gain modeling. We estimate the cross section and rate for ion-impact excitation in aluminum Li-like lasing medium using the ratu slimming jelly instagram approximation for transitions caused by a multipole interaction.
The approximation used for atomic data calculation is presented.
Author s : Anca Mocofanescu ; Vasile D. Q-switching is provided by a nonlinear LiF:F2- crystal before the stimulated Brillouin scattering takes place. Employing proper mode selectors pulses with 6 mJ minimum energy and duration of 20 ns were generated, the beam divergence being 1. A new theoretical model of the Q-switching regime has been proposed and good agreement between experimental and theoretical data has been obtained.
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Sandrock; Ernst Heumann; Guenter Huber Show Abstract The features of a new upconversion mechanism of excitation, the sensitized photon avalanche, are discussed on the basis of a rate equation modeling. In this process the excited state absorption ESA from a metastable level reservoir of the active ion is enhanced by a cross-relaxation between the emitting level of this ion and the sensitizer ion which is able to transfer subsequently the accepted excitation back into the reservoir level of the activator; the donor act of the cross-relaxation ends on this reservoir level too.
When the efficiencies of these two energy transfer processes are larger than specific threshold values related to the intrinsic de-excitation rates of the emitting level of activator and of the excited level of sensitizer, a process of population of the reservoir level with a quantum efficiency larger than the unit for each act of de-excitation of the emitting level takes place.
Further on, if the ESA rate exceeds a threshold value determined by the intrinsic de- excitation of the reservoir and by the efficiencies of the energy transfers an avalanche population of these levels could take place.
This process could be used for infrared pumping of visible solid state lasers.
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Author s : Emil Smeu ; Niculae N. Puscas ; Ion M. Ratu slimming jelly instagram Grigore I. Suruceanu ; Radu G. Ispasoiu Show Abstract Power stabilized DL's represent today convenient sources for radiometric applications, as transfer laboratory standards.