An experimental setup for precision processing of composite materials based on nanosecond pulsed and continuous ytterbium fiber lasers with a wavelength of 1.06 μm and a radiation power up to 1 kW with an optical scanning systems based on galvanic drives with a beam velocity of up to 17 m/s has been developed. The setup provides a power density in a focused light spot with a diameter of ≃100 μm using a continuous laser of 107 W/cm2 and a pulsed laser of 109 W/cm2, which is one order of magnitude higher than the threshold values necessary for removing carbon fiber in the evaporation mode. The focus depth of the focused radiation allows for high-quality processing of sheet blanks.
The development of the electronic industry, with the further miniaturization of electronic components and the use of new materials puts forward increasingly stringent requirements for the quality, reliability and competitiveness of products. All this, in turn, dictates the creation of new technologies and technological processes. The microprocessing laser technologies at R&D production facility "Istok" named after Shokin " for the period 2003-2018, a series of modern automated laser technological installations of the "Caravel" type was created on the basis of industrial lasers and laser systems based on copper vapors and precision three-coordinate tables. This equipment with the diameter of the processing light spot of 10–20 μm and the peak power density of 109-1011 W/cm2 allows for efficient and high quality processing of foil (0.01-0.2 mm) and thin-sheet (0.2-1 mm) metal and the large range of non-metallic materials of microwave products.
A set of output characteristics of copper vapor lasers with an average power level of 30-100 watts is considered. The radiation parameters of active media have been optimized for power consumption, buffer gas pressure of neon and hydrogen, repetition rate, and pump pulse parameters. A thyratron version of the switch was used as a pump generator; its high-voltage modulator has been made according to the capacity voltage doubling scheme with magnetic compression of the current pulses. We shall also discuss the issues of modifying the design of laser tubes (diameter is 4.5 cm, active length is 1520 cm) and the relationship with their lifetime. The issues of modern applications of high-power laser systems based on copper vapor are considered.
The results of numerical simulation of output radiation parameters and efficiency of inductive copper vapor laser (ICVL) of transformer type are presented. The influence of scaling of the ICVL on the possibility of its implementation in practice is analyzed. The parameters of the small-scale model of ICVL for the first experiments on the implementation of a new method of excitation by an electrode-free induction discharge for a copper vapor laser are determined.
We present new results on numerical investigation of characteristics of pulse-periodic inductive copper vapour lasers. In these lasers pump pulses are trains of high-frequency (~ 30 MHz) current oscillations repeated at a frequency of 2-17 kHz. An inductive laser with an annular working volume of 1.7 l was considered and its possible output parameters were studied. We analyze specific features of working medium excitation in an HF-discharge; diversity of the obtained laser pulse shapes and possible applications are discussed as well.
In the present paper we present the results of a comparative analysis of pulsed copper vapour lasers with visible emission wavelengths of 510.6 and 578.2 nm and pulse duration of 10-30 ns and known types of technological lasers as well as the prospects for using the copper vapor laser for microprocessing of materials.
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