Application of tot'hema eosin sensitized gelatin as a potential eye protection filter against direct laser radiation

2016 ◽  
Vol 16 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Branka D. Muric ◽  
Dejan V. Pantelic ◽  
Darko M. Vasiljevic ◽  
Svetlana N. Savic-Sevic ◽  
Branislav M. Jelenkovic
Keyword(s):  
Laser Radiation ◽  
Eye Protection ◽  
Direct Laser ◽  
Protection Filter

scholarly journals Microfabrication and Surface Functionalization of Soda Lime Glass through Direct Laser Interference Patterning

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 129
Author(s):  
Marcos Soldera ◽  
Sabri Alamri ◽  
Paul Alexander Sürmann ◽  
Tim Kunze ◽  
Andrés Fabián Lasagni
Keyword(s):  
Laser Radiation ◽  
Surface Functionalization ◽  
Incident Light ◽  
Chemical Properties ◽  
Visible Spectrum ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Textured Surfaces ◽  
Aspect Ratios ◽  
Direct Laser

All-purpose glasses are common in many established and emerging industries, such as microelectronics, photovoltaics, optical components, and biomedical devices due to their outstanding combination of mechanical, optical, thermal, and chemical properties. Surface functionalization through nano/micropatterning can further enhance glasses’ surface properties, expanding their applicability into new fields. Although laser structuring methods have been successfully employed on many absorbing materials, the processability of transparent materials with visible laser radiation has not been intensively studied, especially for producing structures smaller than 10 µm. Here, interference-based optical setups are used to directly pattern soda lime substrates through non-lineal absorption with ps-pulsed laser radiation in the visible spectrum. Line- and dot-like patterns are fabricated with spatial periods between 2.3 and 9.0 µm and aspect ratios up to 0.29. Furthermore, laser-induced periodic surface structures (LIPSS) with a feature size of approximately 300 nm are visible within these microstructures. The textured surfaces show significantly modified properties. Namely, the treated surfaces have an increased hydrophilic behavior, even reaching a super-hydrophilic state for some cases. In addition, the micropatterns act as relief diffraction gratings, which split incident light into diffraction modes. The process parameters were optimized to produce high-quality textures with super-hydrophilic properties and diffraction efficiencies above 30%.

scholarly journals Formation of microcrystals under the influence of femtosecond laser radiation on carbon samples in liquid nitrogen

2019 ◽  
Vol 220 ◽  
pp. 02005
Author(s):  
Kirill Khorkov ◽  
Dmitry Kochuev ◽  
Anton Chernikov ◽  
Valery Prokoshev ◽  
Sergey Arakelian
Keyword(s):  
Experimental Study ◽  
Laser Radiation ◽  
Liquid Nitrogen ◽  
Subsurface Layer ◽  
Laser Action ◽  
Target Surface ◽  
Femtosecond Laser Radiation ◽  
Carbon Target ◽  
Direct Laser ◽  
Temperature And Pressure

In this paper, we present the results of an experimental study of the carbon microcrystals formation by direct laser action on the carbon target surface at temperature of liquid nitrogen. It is demonstrated that the formation of microcrystals occurs in the subsurface layer and is caused by the achievement of critical temperature and pressure.

Investigations on Integrated Optical Interference Couplers in PMMA for Visible and Infrared Range Fabricated by “Direct Writing” Excimer Laser Radiation

2019 ◽  
Vol 40 (2) ◽  
pp. 149-160
Author(s):  
Humza Mirza ◽  
Bin Wu ◽  
Sabine Tiedeken ◽  
Volker Braun ◽  
Hans Josef Brückner ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Excimer Laser ◽  
Optical Waveguides ◽  
Near Field ◽  
Single Mode ◽  
Structure Design ◽  
Infrared Range ◽  
Direct Writing ◽  
Direct Laser ◽  
Excimer Laser Radiation

Abstract Optical waveguides were generated in Polymethylmethacrylate using “direct” laser and contact mask structuring. Excimer laser radiation (248 nm) produced a local refractive index increase thereby achieving light guiding in waveguides with widths from 2 to 15 $\mu$m. The near field output images were analyzed using visible and infrared laser light. The mode fields of single mode structures were evaluated to elaborate numerically the parameters of the index profile. An index increase up to 0.01 could be achieved using laser pulses at fluences below $0.15$ ${\textrm{J/cm}^{2}}$. Thus it was possible to design interference couplers of 5 $\mu$m waveguides width for the visible (635 nm to 670 nm) as well as for the infrared range at 1550 nm. The coupling properties as a function of the waveguide separation and the wavelength is investigated and found compatible with numerical simulations for the structure design. The presented approach allows for designing and fabricating single mode couplers in an efficient and simple manner.

Direct Laser Deposition with Transversal Oscillating of Laser Radiation

2018 ◽  
Author(s):  
G.A. Turichin ◽  
E.V. Zemlyakov ◽  
M.V. Kuznetsov ◽  
K.D. Babkin ◽  
A.I. Kurakin ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Laser Deposition ◽  
Direct Laser Deposition ◽  
Direct Laser

scholarly journals Influence of Laser Radiation Transversal Oscillation on a Quality Formation at the Direct Laser Deposition

2018 ◽  
Vol 1109 ◽  
pp. 012052
Author(s):  
A. Kurakin ◽  
V. Murzin ◽  
V. Karpov ◽  
M. Kuznetsov ◽  
E. Zemlyakov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Laser Deposition ◽  
Direct Laser Deposition ◽  
Direct Laser ◽  
Quality Formation

scholarly journals Design and development of laser eye protection filter

2013 ◽  
Vol 439 ◽  
pp. 012023
Author(s):  
K Ahmed ◽  
A N Khan ◽  
A Rauf ◽  
A Gul ◽  
M Aslam
Keyword(s):  
Design And Development ◽  
Eye Protection ◽  
Protection Filter

scholarly journals Automation of Dosimetric Control for Laser Radiation

2018 ◽  
pp. 28-35
Author(s):  
P. Neyezhmakov ◽  
E. Tymofeiev ◽  
О. Lyashenko
Keyword(s):  
Laser Radiation ◽  
Optical System ◽  
Optical Glass ◽  
Rapid Determination ◽  
Laser System ◽  
Processing Unit ◽  
Automated Method ◽  
Direct Laser ◽  
Angular Coordinates

The wide application of laser systems and the increase in the values of their energy characteristics, which may hazard to the health of staff and other people in the area of direct and reflected laser radia­tion, necessitates a permanent dosimetric monito­ring in these areas. However, the methods of mea­suring the parameters of laser radiation at a given point in space to determine the degree of radiation safety for the human body, established in the stan­dard DSTU EN 60825-1: 2016, are difficult to implement when using obsolete monitoring equipment. Therefore, the development of an automated method for determining the characteristics of a laser system and the rapid detection and determination of the direction and coordinates of laser radiation is relevant. The proposed method for automated determination of the laser system characteristics differs by applying an additional measurement channel with a photodetector, as in the main channel, and a compensated filter to ensure the difference of the rea­dings in the channels, so that each difference of measured channel values corresponds to the one wavelength value. For the formation of a compensation filter with a constant spectral characteristic in the most demanded wavelength range from 0.4 microns to 1.1 microns are used by known methods of calculation and manufacturing. A combination of optical glass NSNU 13 and SZS-9 with varying thickness as a compensation filter is permitting measure of laser irradia­tion doze for radiation in this range with an error that does not exceed 15%. It is necessary to perform the tasks of quickly finding and estimating the angular coordinates of the laser sources for monitoring the parameters of laser radiation in the working area. Improving the design of the device for detecting and determining the angular coordinates of laser radiation is made by using an optical system that directs laser radiation to a photodetector of radiation and an information processing unit, in front of which a volume matted screen is installed so that the distance from the middle of the optical system to the nearest point of the screen is greater distance of the optical system. The photodetector matrix installed in the optical system focus is used as a photodetector of laser radiation. The application of spherical screens for direct laser radiation and cones for diffused and diffused reflec­ted radiation is proposed for the effective and rapid determination of radiation corners in the working zone. Dosimeters with automated wavelength monitoring and detection and determination of the angular coordinates of laser radiation will facilitate and reduce the cost of conducting dosimetry monitoring.

scholarly journals Numerical Estimation of the Geometry of the Deposited Layers during Direct Laser Deposition of Multi-Pass Walls

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1972
Author(s):  
Ilya Udin ◽  
Ekaterina Valdaytseva ◽  
Nikita Kislov
Keyword(s):  
Laser Radiation ◽  
Mechanical Engineering ◽  
Complex Geometry ◽  
Calculated Data ◽  
Laser Deposition ◽  
Laser Radiation Intensity ◽  
Calculation Algorithm ◽  
Direct Laser Deposition ◽  
Bead Formation ◽  
Direct Laser

Direct laser deposition (DLD) is a promising additive technology that allows for the rapid and cheap production of metal parts of complex geometry in various sectors of mechanical engineering. Thick-walled metal structures occupy a significant part in mechanical engineering. The purpose of this study was to develop and test an algorithm for predicting the geometry of deposited multi-pass walls. To achieve this goal, the main interrelated processes involved in the formation of a multi-pass wall were described—the process of laser radiation propagation, the process of heat transfer and the process of bead formation. To construct the calculation algorithm, five characteristic types of beads are identified. For these five types, the features of the bead formation and the features of the laser radiation intensity distribution are described. The calculated data were verified. A good match of the calculated data with the geometry of the deposited walls from AISI321 steel, Inconel718 and Ti-6Al-4V alloys was obtained.

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