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The Influence of the Laser Beam Fluence on Change in Microstructure, Microhardness and Phase Composition of Feb-Fe2B Surface Layers Produced on Vanadis-6 Steel

A. Bartkowska P. Jurči M. Hudáková D. Bartkowski M. Kusý D. Przestacki
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 2 | DOI: 10.24425/122405
Keywords diode laser boronizing aser modification microstructure Vanadis steel
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Abstract

The paper presents the study results of laser modification of Vanadis-6 steel after diffusion boronized. The influence of laser beam fluence on selected properties was investigated. Diffusion boronizing lead to formation the FeB and Fe2B iron borides. After laser modification the layers were consisted of: remelted zone, heat affected zone and substrate. It was found that increase of laser beam fluence have influence on increase in dimensions of laser tracks. In the thicker remelting zone, the primary dendrites and boron eutectics were detected. In the thinner remelting zone the primary carbo-borides and eutectics were observed. In obtained layers the FeB, Fe2B, Fe3B0.7C0.3 and Cr2B phases were detected. Laser remelting process caused obtained the mild microhardness gradient from the surface to the substrate. In the remelted zone was in the range from 1800 HV0.1 to 1000 HV0.1. It was found that the laser beam fluence equal to 12.7 J/mm2 was most favorable. Using this value, microhardness was relatively high and homogeneous.
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Authors and Affiliations

A. Bartkowska
P. Jurči
M. Hudáková
D. Bartkowski
M. Kusý
D. Przestacki

Laser diode distance measuring interferometer - metrological properties

Marek Dobosz
Metrology and Measurement Systems | 2012 | No 3 | 553-564 | DOI: 10.2478/v10178-012-0048-1
Keywords diode laser wavelength stabilization interferometer interferometer distance measurement.
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Abstract

A novel laser diode based length measuring interferometer for scientific and industrial metrology is presented. Wavelength the stabilization system applied in the interferometer is based on the optical wedge interferometer. Main components of the interferometer such as: laser diode stabilization assembly, photodetection system, measuring software, air parameters compensator and base optical assemblies are described. Metrological properties of the device such as resolution, measuring range, repeatability and accuracy are characterized.

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Authors and Affiliations

Marek Dobosz

Thermal analysis of a two-dimensional array with surface light emission based on nitride EEL lasers

Dominika Dąbrówka Robert P. Sarzała Michał Wasiak Anna Kafar Piotr Perlin Kiran Saba
Opto-Electronics Review | 2022 | 30 | 4 | e144115 | DOI: 10.24425/opelre.2022.144115
Keywords GaN diode laser array with surface light emission thermal analysis
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Abstract

This paper presents the results of a thermal computational analysis of a two-dimensional laser array emitting from a surface. The array consisted of eight equispaced ridge-waveguide edge-emitting nitride diode lasers. Surface emission of light was obtained using mirrors inclined at 45°. The authors investigate how the geometrical dimensions of the array emitters and their pitch in the array affect the increase and distribution of temperature in the device. They also examine the influence on the temperature increase and distribution of the thickness of the insulating SiO2, the thickness of the gold layer forming the top contact of the laser, and the thickness of the GaN substrate, as well as the influence of the ridge-waveguide width.
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Bibliography

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Authors and Affiliations

Dominika Dąbrówka
1
ORCID: ORCID
Robert P. Sarzała
1
ORCID: ORCID
Michał Wasiak
1
ORCID: ORCID
Anna Kafar
2
ORCID: ORCID
Piotr Perlin
2
ORCID: ORCID
Kiran Saba
2
ORCID: ORCID
  1. Institute of Physics, Lodz University of Technology, 217/221 Wólczańska St., 93-005 Łódź, Poland
  2. Institute of High Pressure Physics, Polish Academy of Sciences, 29/37 Sokołowska St., 01-142 Warsaw, Poland

Simple three-stage frequency-stabilized diode laser system using injection-locking and tapered amplifier

Jerzy Szonert Małgorzata Głódź Krzysztof Kowalski
Opto-Electronics Review | 2022 | 30 | 1 | e140146 | DOI: 10.24425/opelre.2022.140146
Keywords diode laser optical injection-locking master oscillator power amplifier optical limiting amplifier tapered amplifier
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Abstract

We developed a three-stage, amplifying, tunable diode laser system that comprises a master laser in a Littrow configuration, frequency-stabilized by dichroic atomic vapour laser lock, acousto-optic frequency shifter, injection-locked slave laser, and tapered amplifier. The slave amplifies the injected frequency-shifted master beam while suppressing (within 0.5  %) the strong dependence of its intensity on the acousto-optic frequency shifter carrier frequency, thus acting as a strongly saturated optical limiting amplifier with constant output power. The resulting beam is then amplified in a tapered amplifier. The system provides an output power above 700 mW at a wavelength of 780 nm, with a time-averaged linewidth of 0.6 MHz, and a frequency drift below 2 MHz/h. Dichroic atomic vapour laser lock enables frequency stabilization in the range of 400 MHz around D2 lines of rubidium. The mode-hop-free tuning range amounts to 2 GHz. Determined by the acousto-optic frequency shifter model used, the fine-tuning range (precision of few tens kHz) spans 70 MHz. A description of the system was presented and its performance was tested. The basic components have been designed in our laboratory.
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Authors and Affiliations

Jerzy Szonert
1
ORCID: ORCID
Małgorzata Głódź
1
ORCID: ORCID
Krzysztof Kowalski
1
  1. Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

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