scholarly journals High power ytterbium-doped fiber lasers — fundamentals and applications

2014 ◽  
Vol 28 (12) ◽  
pp. 1442009 ◽  
Author(s):  
Michalis N. Zervas
Keyword(s):  
Material Processing ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Industrial Applications ◽  
Optical Damage ◽  
Fiber Nonlinearities ◽  
Fundamental Properties ◽  
Power Evolution

In this paper, we summarize the fundamental properties and review the latest developments in high power ytterbium-doped fiber (YDF) lasers. The review is focused primarily on the main fiber laser configurations and the related cladding pumping issues. Special attention is placed on pump combination techniques and the parameters that affect the brightness enhancements observed in high power fiber lasers. The review also includes the major limitations imposed by fiber nonlinearities and other parasitic effects, such as optical damage, modal instabilities and photodarkening. The paper summarizes the power evolution in continuous-wave (CW) and pulsed YDF lasers and their impact on material processing and other industrial applications.

scholarly journals Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

2021 ◽  
Author(s):  
Hossein Fathi ◽  
Mikko Närhi ◽  
Regina Gumenyuk
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Beam Quality ◽  
Coherent Beam ◽  
Laser Source ◽  
Coherent Beam Combining ◽  
Beam Combining ◽  
Wide Range

Fiber laser technology has been demonstrated as a versatile and reliable approach for laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges are discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

scholarly journals Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 566
Author(s):  
Hossein Fathi ◽  
Mikko Närhi ◽  
Regina Gumenyuk
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Beam Quality ◽  
Coherent Beam ◽  
Laser Source ◽  
Coherent Beam Combining ◽  
Beam Combining ◽  
Wide Range

Fiber laser technology has been demonstrated as a versatile and reliable approach to laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single-fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high-power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges is discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

scholarly journals Development of fiber laser optic system for laser polishing of parts

2016 ◽  
Vol 1 (9) ◽  
pp. 16-23 ◽  
Author(s):  
Александр Савкин ◽  
Aleksandr Savkin ◽  
Владислав Фунтиков ◽  
Vladislav Funtikov ◽  
Александр Григорьянц ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Lasers ◽  
Sample Surface ◽  
Optic System ◽  
Laser Polishing ◽  
Approximate Description ◽  
Laser Head ◽  
Laser Optic

The possibility of an approximate description of a multimode beam of a fiber laser in the Zemax modeling system for the development of an optic system of a laser head is shown. There are developed and manufactured optic units of a laser head taking into account characteristic peculiarities of radiation of high-power fiber lasers. The possibilities are shown the developed optic system in the technology of laser polishing by the remelting of a sample surface made of stainless steel of type 1540-00.

Four-wave mixing effect on high-power continuous-wave all-fiber lasers

2018 ◽  
Vol 32 (23) ◽  
pp. 1850275
Author(s):  
Jinkun Zheng ◽  
Wei Zhao ◽  
Baoyin Zhao ◽  
Zhe Li ◽  
Gang Li ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Beam Quality ◽  
Matching Condition ◽  
Four Wave Mixing ◽  
Theoretical Description ◽  
Phase Matching ◽  
Wave Mixing ◽  
Mixing Effect

A four-wave mixing effect on high-power continuous-wave fiber lasers has been demonstrated theoretically and experimentally. Detailed theoretical description of phase matching is presented and we found that the phase matching condition is satisfied at the frequency shift of 5.16 THz. While the intensity in fiber core region is more than about 394 MW/cm2, the four-wave mixing products of 1100 nm and 1060 nm were also observed in high-power all-fiber laser. The comparison shows that the experiment result is in good agreement with the simulation result. In addition, the beam quality deterioration for the laser is caused by the four-wave mixing effect and the mode instability. The [Formula: see text] factor measured at maximal intensity of 478 MW/cm2 is 2.80.

Free-running and imposed-wavelength cavities for high power continuous-wave Tm3+, Ho3+ codoped single-oscillator fiber laser

2021 ◽  
Author(s):  
Arnaud Motard ◽  
Christophe Louot ◽  
Thierry Robin ◽  
Benoit Cadier ◽  
Nicolas Dalloz ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Continuous Wave ◽  
Single Oscillator ◽  
Free Running

Single-frequency, high-power, continuous-wave fiber-laser-pumped Ti:sapphire laser

2011 ◽  
Vol 51 (1) ◽  
pp. 15 ◽  
Author(s):  
Suddapalli Chaitanya Kumar ◽  
Goutam Kumar Samanta ◽  
Kavita Devi ◽  
Stefano Sanguinetti ◽  
Majid Ebrahim-Zadeh
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Continuous Wave ◽  
Single Frequency ◽  
Ti:Sapphire Laser

High-power continuous-wave cladding-pumped Raman fiber laser

2006 ◽  
Vol 31 (15) ◽  
pp. 2290 ◽  
Author(s):  
C. A. Codemard ◽  
P. Dupriez ◽  
Y. Jeong ◽  
J. K. Sahu ◽  
M. Ibsen ◽  
...  
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Continuous Wave ◽  
Raman Fiber Laser

Elucidation of Welding Stability Based on Keyhole Configuration during High-Power Fiber Laser Welding

2011 ◽  
Vol 314-316 ◽  
pp. 941-944 ◽  
Author(s):  
Xiang Dong Gao ◽  
Qian Wen ◽  
Seiji Katayama
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Continuous Wave ◽  
High Energy ◽  
High Energy Density ◽  
Deep Penetration ◽  
Characteristic Parameters ◽  
Fiber Laser Welding ◽  
Welding Stability

During deep penetration laser welding, a keyhole is formed in the molten pool due to the intense recoil pressure of evaporation. The formation of the keyhole leads to a deep penetration weld with a high aspect ratio and this is the most advantageous feature of welding by high-energy-density beams. The configuration and characteristics of a keyhole are related to the welding stability. In a fiber laser butt-joint welding of Type 304 austenitic stainless steel plate with a high power 10 kW continuous wave fiber laser, an infrared sensitive high-speed video camera was used to capture the dynamic images of the molten pools. The configurations of a keyhole were analyzed through image processing techniques such as median filtering, wiener filtering and gray level threshold segmentation to obtain the edge of a keyhole. The width and the area of a keyhole were defined as the keyhole characteristic parameters, and the deviation between the laser beam and weld center as a parameter reflecting the welding stability. By analyzing the change of the keyhole characteristic parameters during welding process, it was found that these parameters were related to the welding stability. Welding experimental results and analysis of the keyhole characteristic parameters confirmed that the welding stability could be monitored and distinguished by a keyhole configuration during high-power fiber laser welding.

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