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[en] The use of a self-filtering cavity in a laser makes it possible to obtain a high-quality high-power output beams. A maximum output power of 8.3 kW with an electrooptical efficiency of 11.3% is obtained. Estimates show that a high-quality beam with power up to 20 kW can be generated in electric-discharge CO2 lasers with a self-filtering cavity. (lasers)
[en] Theoretical studies of a phototriggered XeCl excimer laser have been performed through the development of a zero-dimensional model and used for conditions close to experiment for about 50-100 ns laser pulse duration with electron power deposition in the MW/cm3 range and inside a 300 cm3 chamber. The well-known parallel resistor network model is used. The plasma generated by the impulse discharge is represented by one or more resistance in parallel, whose conductivity is proportional to the electron density. Time variation of the electron density is obtained by integrating the transport equations coupled to the heavy species kinetic and the external circuit. This study provides the time variation of the discharge characteristics as well as the influence of the gas composition on these characteristics. The results have been discussed and analyzed. Calculated discharge current and voltage are also compared with experimental results. Finally, the use of the present model allows a good comprehension of the halogen depletion phenomena, which is the principal cause of laser ending and allows a simple study of the evolution of a large-scale heterogeneity in preionization density and its effect on electrical and chemical plasma properties
[en] The optical quality of the output pulse produced by the LASL CO2 laser amplifier system was studied by calculating the time resolved intensity distribution obtained at the focus of a perfect lens. (U.S.)
[en] A numerical investigation of a fast-flow CO2 laser with an unstable cavity and with phase inhomogeneities demonstrated that two stable mutimode lasing regimes can exist. In each regime the lasing characteristics depend continuously, in certain intervals, on the amplitude of phase inhomogeneities. The existence of two regimes may give rise to transients as a result of small changes in the cavity phase inhomogeneities. (lasers)
[en] The results of model calculations for the optimization of the efficiency of high-gain amplifier systems stabilized by saturable absorbers are described. It is shown that the isolator performance can be characterized by a convenient figure of merit
[en] Highlights: ► Multi-hundred watt UV excimer lasers are used in industrial high-volume microprocessing. ► Excimer laser operational lifetime of two years under typical production conditions yields affordable high power UV laser processing. ► Laser lift-off processing of LEDs is facilitated by the large per-shot-area of excimer lasers. - Abstract: Excimer lasers emitting in the UV to far UV region are by nature the laser sources enabling the highest optical resolution and strongest material–photon interaction. At the same time, excimer lasers deliver unmatched UV pulse energies and output powers up to the kilowatt range. Thus, they are the key to fast and effective large area processing of smallest structures with micron precision. As a consequence, excimer lasers are the UV technology of choice when it comes to high-performance microstructuring with unsurpassed quality and process repeatability in applications such as drilling advanced ink jet nozzles or patterning biomedical sensor structures.
[en] Thick film conductor layer has been ablated by focussed sub-picosecond excimer laser beam to form narrow (typically 20-μm wide) isolation gaps for conducting polymer based sensor application
[en] The possibility of improving the electric discharge stability, increasing the efficiency, and expanding the dynamic operating range of an industrial self-sustained discharge CO2 laser using additional ionisation by high-voltage nanosecond pulses is studied. (control of laser radiation parameters)
[en] Development of a new technology for commercial application can be significantly accelerated by leveraging related technologies used in other markets. Synergies across multiple application domains attract research and development (R and D) talent - widening the innovation pipeline - and increases the market demand in common components and subsystems to provide performance improvements and cost reductions. For these reasons, driver development plans for inertial fusion energy (IFE) should consider the non-fusion technology base that can be lveraged for application to IFE. At this time, two laser driver technologies are being proposed for IFE: solid-state lasers (SSLs) and KrF gas (excimer) lasers. This document provides a brief survey of organizations actively engaged in these technologies. This is intended to facilitate comparison of the opportunities for leveraging the larger technical community for IFE laser driver development. They have included tables that summarize the commercial organizations selling solid-state and KrF lasers, and a brief summary of organizations actively engaged in R and D on these technologies.
[en] The influence of a dc external magnetic field B0 on the output power of a rf excited CO2 laser is considered. The voltage-current density characteristic curve, electron temperature, deposited power, and gas mixture temperature of the plasma are numerically investigated in the presence of the external magnetic field. The electric discharge of the magnetized rf excited CO2 laser is seen to be stable. It is shown that the deposited power into the plasma increases with increasing magnetic field intensity. Mean temperature of the gas mixture of the magnetized rf excited CO2 laser is computed as a function of B0, which is substantially increased at a relatively strong B0. An experimental setup is conducted to measure the output power of a rf excited CO2 laser in the presence of B0. It is found by applying B0 upon the laser the output power increases