scholarly journals DETERMINATION OF WORKING INTERVALS OF POWER DENSITY FOR LASER MARKING OF 50ChN STEEL

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Nikolay Angelov
Keyword(s):  
Laser Radiation ◽  
Visual Perception ◽  
Fiber Laser ◽  
Power Density ◽  
Near Infrared ◽  
Laser Marking ◽  
Theoretical Considerations

Studies relate to two basic methods of steel marking − by melting and by evaporation. Based on theoretical considerations, preliminary intervals of power density for laser marking of 50 ChN steel are determined. Experiments are carried out with fiber laser, operating in the near infrared area. Graphics on the dependence of contrast of marking from the power density of laser radiation for two methods of marking were developed. Working intervals of the power density for marking by melting and by evaporation for visual perception of marking and using the readers were defined.

scholarly journals STUDY OF THE INFLUENCE OF DEFOCUSED LASER MARKING PROCESS BY MELTING ON SAMPLES OF STEEL

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Nikolay Angelov
Keyword(s):  
Visual Perception ◽  
Fiber Laser ◽  
Structural Steel ◽  
Laser Marking ◽  
Power Densities

The studies relate to the process of laser marking by melting on the samples of structural steel. The zone of Raleigh for fiber laser was determined. The theoretical dependences of the diameter of the working spot from defocusing and diameter of the radiation falling on the lens were received. Experiments were realized with 50G structural steel. The dependence of contrast of marking from defocusing for two power densities was determined. Working intervals were determined for studied magnitudes for visual perception of the marking.

scholarly journals INVESTIGATING THE INFLUENCE OF THE NUMBER OF REPETITIONS AND VOLUMETRIC ENERGY DENSITY ON LASER MARKING OF PRODUCTS

2014 ◽  
Vol 5 (2) ◽  
Author(s):  
Nikolay Angelov
Keyword(s):  
Stainless Steel ◽  
Energy Density ◽  
Fiber Laser ◽  
Power Density ◽  
Experimental Results ◽  
Absorbed Energy ◽  
Laser Marking ◽  
Factors Affecting ◽  
Volumetric Density

The basic factors affecting the laser marking of products – volumetric density of the absorbed energy and the number of repetitions, were studied. Experiments were conducted of marking the samples of stainless steel with fiber laser. The dependence of the contrast of marking from the power density for different number of repetitions, and also the volumetric density of the absorbed energy from speed was obtained and the experimental results analyzed.

Nonlinear Micro-Processing of Silicon by Ultrafast Fiber Laser at 1552 nm

2011 ◽  
Vol 1365 ◽  
Author(s):  
Yoshiro Ito ◽  
Rie Tanabe ◽  
Kozo Tada
Keyword(s):  
Laser Radiation ◽  
Fiber Laser ◽  
Spectral Range ◽  
Near Infrared ◽  
Short Pulse ◽  
Crystal Oscillator ◽  
Linear Absorption ◽  
Frequency Adjustment ◽  
Non Linear ◽  
Short Pulse Lasers

ABSTRACTProcessing of transparent materials by non-linear absorption mechanisms induced by short pulse lasers has been applied in many fields. Silicon (Si) is widely used materials in microelectronics, MEMS and photonics. It is, however, not transparent for commonly used processing lasers in near infrared to ultraviolet spectral range and has not been a subject for the non-linear processing by lasers so far. In this paper, possibilities and capabilities of non-linear processing of Si by 900 fs, 1552nm laser radiation are described with special emphasis on application to frequency adjustment of a crystal oscillator in a package made from Si.

scholarly journals INFLUENCE OF THE OVERLAP COEFFICIENT ON THE CONTRAST IN LASER MARKING OF C110W STEEL

2021 ◽  
Vol 3 ◽  
pp. 15-19
Author(s):  
Nikolay Angelov ◽  
Lybomir Lazov ◽  
Edmunds Teirumnieks
Keyword(s):  
Experimental Data ◽  
Fiber Laser ◽  
Power Density ◽  
Tool Steel ◽  
Laser Marking ◽  
Processing Zone ◽  
Power Densities ◽  
Overlap Coefficient

The laser marking process by melting samples of C110W carbon tool steel was studied. The experiments were performed with a fiber laser and a CuBr laser. A field of squares is marked in a raster method for different values of the overlap coefficient and power density. The contrast of the marking is determined on each marked square. From the obtained experimental data, graphs of the dependence of the contrast on the overlap coefficient for three power densities were drawn. The obtained results for the two lasers are compared and the influence of the wavelength is indirectly analysed. The working intervals of the overlap coefficient for the studied power densities for the two lasers at which the optimal contrast in the processing zone is obtained are determined.

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