Design and Implementation of Absorption and Scattering Chamber Test of a High-Power Fiber Laser Beam by Gases and Solids in the Far-Field

2021 ◽  
Author(s):  
Abdalrhman Adel Mohamed ◽  
Moustafa Ahmed ◽  
Hesham F. A. Hamed ◽  
Mohamed Shehata ◽  
Ahmed R. Elsawi ◽  
...  
Keyword(s):  
Laser Beam ◽  
Fiber Laser ◽  
High Power ◽  
Far Field ◽  
Design And Implementation ◽  
Scattering Chamber

Detection of Weld Seam Position Based on Infrared Image during High Power Fiber Laser Welding

2012 ◽  
Vol 549 ◽  
pp. 1007-1011
Author(s):  
Yu Quan Chen ◽  
Xiang Dong Gao ◽  
Jian Yuan Huang ◽  
Qian Wen
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Fiber Laser ◽  
Least Squares ◽  
High Power ◽  
Least Squares Method ◽  
Infrared Image ◽  
Seam Tracking ◽  
Fiber Laser Welding ◽  
Welding Seam

Seam tracking is significant to obtain good welding quality. Aiming at establishing a model to detect and calculate the seam tracking offset during high-power fiber laser welding of Type 304 austenitic stainless steel plate butt joint welding, an infrared sensitive high-speed camera arranged off-axis orientation of laser beam was applied to capture the dynamic thermal images of molten pool. Through analyzing the infrared image, the actual position of the workpiece gap in the image was obtained. Least squares method was used to determine the precise position of the actual workpiece gap. A model that calculated the deviations between the workpiece gap and the laser beam was deduced. Also, the least squares method was used to fit the workpiece gap curve equation. The coordinate transformation technology was used and the welding seam equation was established. A linear model was obtained to detect the deviations between the workpiece gap and the welding seam. The welding experiments confirmed that the proposed welding seam equation was effective.

Domain refinement of grain oriented electrical steel with high power laser beam sources

2014 ◽  
Vol 28 (12) ◽  
pp. 1442003 ◽  
Author(s):  
P. Rauscher ◽  
J. Hauptmann ◽  
A. Wetzig ◽  
E. Beyer
Keyword(s):  
Magnetic Properties ◽  
Laser Beam ◽  
Fiber Laser ◽  
High Power ◽  
Electrical Steel ◽  
Laser Energy ◽  
Core Loss ◽  
Core Material ◽  
Beam Source ◽  
Laser Scribing

Laser magnetic domain refinement (LMDR) is applied to reduce the power losses of grain oriented electrical steel, which is used as core material in power or distribution transformers, by generating thermal stress due to the absorbed laser energy. The most widely used laser beam source for the industrial utilization is the CO 2 laser beam source with typical core loss improvements of about 10%. In this paper the dependency of treatment parameters with respect to the magnetic properties of the steel sheets are investigated for the laser scribing process using a high power fiber laser beam source. Especially the treatment properties, which are influenced by the laser beam source, such as focusability, wavelength and absorption behavior, are addressed in this paper. Therefore, single sheets 300 mm × 30 mm × 0.27 mm (high-permeability, comparable to M103-27P) are measured before and after the laser scribing process to evaluate the magnetic properties, as well as the loss components. The analysis has shown that the core loss can be improved by approximately 13% using the fiber laser by scribing invisible lines on the sheet surface.

scholarly journals Fabrication of 2 kW-Level Chirped and Tilted Fiber Bragg Gratings and Mitigating Stimulated Raman Scattering in Long-Distance Delivery of High-Power Fiber Laser

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 369
Author(s):  
Xiaofan Zhao ◽  
Xin Tian ◽  
Meng Wang ◽  
Binyu Rao ◽  
Hongye Li ◽  
...  
Keyword(s):  
Laser Beam ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Fiber Bragg Gratings ◽  
Long Distance ◽  
Laser Beam Quality ◽  
Distance Delivery

Chirped and tilted fiber Bragg gratings (CTFBGs) have attracted a lot of attention in stimulated Raman scattering (SRS) suppression of high-power fiber lasers. However, the laser power handling capacity seriously limits their applications. In this paper, by optimizing the inscription parameters and post-processing strategy, we fabricate a large-mode-area double-cladding CTFBG with a thermal slope of ~0.015 °C/W due to the low insertion loss of about 0.15 dB, which make it possible for direct kilowatt-level application. A 2 kW-level fiber laser oscillator is employed to test the CTFBG, and a series of experiments have been carried out to compare the effect of SRS mitigation in high-power fiber laser long-distance delivery. In addition, the influence of CTFBGs on laser beam quality is studied for the first time. Experimental results indicated that the CTFBG could effectively mitigate SRS and has no obvious influence on laser beam quality. This work opens a new opportunity for further power scaling and the delivery of high-power fiber lasers over longer distances.

scholarly journals Interaction between Laser Beam and Plasma/Plume Induced in Welding of Stainless Steel with Ultra-High Power Density Fiber Laser

2007 ◽  
Vol 25 (3) ◽  
pp. 461-467 ◽  
Author(s):  
Yousuke KAWAHITO ◽  
Keisuke KINOSHITA ◽  
Naoyuki MATSUMOTO ◽  
Masami MIZUTANI ◽  
Seiji KATAYAMA
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Fiber Laser ◽  
Power Density ◽  
High Power ◽  
Plasma Plume ◽  
High Power Density

scholarly journals Investigation of the spatial structure of a high-power fiber laser beam

2015 ◽  
Vol 584 ◽  
pp. 012006 ◽  
Author(s):  
Pavel A Nosov ◽  
Alexander F Shirankov ◽  
Alexander G Grigoryants ◽  
Roman S Tret'yakov
Keyword(s):  
Spatial Structure ◽  
Laser Beam ◽  
Fiber Laser ◽  
High Power

Seam Tracking Monitoring Based on Keyhole Features during High-Power Fiber Laser Welding

2011 ◽  
Vol 314-316 ◽  
pp. 932-936
Author(s):  
Xiang Dong Gao ◽  
Ling Mo ◽  
Seiji Katayama
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
High Speed ◽  
Continuous Wave ◽  
Welding Process ◽  
Seam Tracking ◽  
Fiber Laser Welding ◽  
Welding Seam

Seam tracking is an important field to obtain good welding quality. During the high-power fiber laser welding, the laser beam focus must be controlled to track the welding seam accurately. A method of detecting the offset between the laser beam focus and the welding seam based on analyzing the keyhole features was researched during high-power fiber laser butt-joint welding of Type 304 austenitic stainless steel plates at a continuous wave fiber laser power of 10 kW. The joint gap width was less than 0.1mm. An infrared sensitive high speed camera was used to capture the thermal images of a molten pool in welding process. Two parameters called the keyhole centroid and keyhole shape were defined as the eigenvalues of seam tracking offset to determine the offset between the laser beam focus and the desired welding seam. The welding experiments confirmed that the offset between the laser beam focus and the welding seam could be monitored and estimated by the keyhole centroid and keyhole shape parameters effectively.

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