laser impulse
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Author(s):  
W.-S. Chung ◽  
F. Nagel ◽  
A. Olowinsky ◽  
A. Gillner

AbstractThe laser impulse metal bonding (LIMBO) process opens a new possibility to join a thick interconnector on a thin metal layer which lays on a sensitive substrate such as epoxy resin (FR4) material. Since the FR4 tolerates only limited amount of the thermal load during the joining process, the LIMBO process applies a novel approach to separate the melting and joining phase. Hence, the thermal load on the underlying substrate during the joining phase is minimized and therefore allows a welding approach even for electric as well as electronic components. However, the substrate is thermally affected due to the heat conduction which is induced during the joining phase. In this paper, the thermal cycle induced to the sensitive substrate during the LIMBO process and the overlap welding process for enlarging the weld joint area will be investigated. To evaluate the maximal amount of thermal load on the sensitive substrate below a thin copper layer by given setting, the thermal destruction threshold of substrate is exceeded on purpose. For the understanding of the heat distribution during the joining stage, the experimental results are validated with simulation results.


2020 ◽  
Vol 312 ◽  
pp. 281-287
Author(s):  
Yuriy Shevchenko ◽  
Roman Volotovskiy ◽  
Egor Vasiliev ◽  
Alexander Perzhu ◽  
Dmitrii Kapitan ◽  
...  

We utilize the Metropolis algorithm to obtain statistical averages of the domain wall length in a FePt granular structure after remagnetization is performed by an ultrashort polarized laser impulse. We propose and check the cluster-size-based order parameter, which along with magnetization, shows the domain wall length, and as a consequence, the average cluster size in the system. We treat the inverse Faraday effect as an external directed magnetic field and show impulse time- and laser power- dependent estimates within the Heisenberg model.


scholarly journals Semiconductor Physics, Quantum Electronics & Optoelectronics, 23 (1), P. 71-74 (2020). DOI: https://doi.org/10.15407/spqeo23.01.071 Pyroelectric USB-joulemeters of pulsed laser radiation V.B. Samoylov, L.V. Levash, O.A. Rosnovskiy, M.Yu. Vedula, V.S. Rad'ko Institute of Physics, NAS of Ukraine, 46, prospect Nauky, 03680 Kyiv, Ukraine E-mail: [email protected] Abstract. The general arrangement, principle of operation and basic parameters of pyroelectric USB-meters of energy of pulsed laser radiation have been described. A smart head of the meter converts the signal from the pyroelectric sensor and immediately transfers it to PC using a high-speed USB 2.0 connection. The device consists of two circuit panels located in the common package. The pyroelectric sensitive element and preamplifier are mounted on the sensor panel. Output of the preamplifier is connected with input of the preliminary digital processing panel. The meter is connected with host computer that performs further processing, storage and monitoring of data. Sensor panel can be produced in two modifications, dependently on the pulse energy. Sensitive elements on the base of LiNbO3 or LiTaO3 with absorbing coatings are used for measuring the low-energy pulses, whereas the transparent sensitive elements with a small intrinsic absorption is used for measurements of high-energy radiation pulses. The pulse rate and pulse energy can vary from single pulses up to 2 kHz and from 0.1 μJ up to 0.5 J, respectively. Keywords: laser, impulse radiation, joulemeter, detector, pyroelectric. Full Text (PDF) Back to Volume 23 N1 Creative Commons License This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

2020 ◽  
Vol 23 (1) ◽  
pp. 71-74
Author(s):  
V.B. Samoylov ◽  
◽  
L.V. Levash ◽  
O.A. Rosnovskiy ◽  
M.Yu. Vedula ◽  
...  

Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 753-757
Author(s):  
Woo-Sik Chung ◽  
Justin Reska ◽  
Alexander Olowinsky ◽  
Arnold Gillner

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