Destruction Of Optical Fibers Used In High Power Continuous Wave And Repetitive Pulsed Laser Systems Due To Defects And Surface Absorption

1990 ◽  
Author(s):  
J. R. Palmer
Keyword(s):  
Optical Fibers ◽  
High Power ◽  
Continuous Wave ◽  
Pulsed Laser ◽  
Surface Absorption ◽  
Laser Systems

scholarly journals Thermal imaging of high power ultrashort pulse laser ablation of alumina towards temperature optimized micro machining strategies

2021 ◽  
Vol 1135 (1) ◽  
pp. 012027
Author(s):  
Stefan Rung ◽  
Niklas Häcker ◽  
Ralf Hellmann
Keyword(s):  
Laser Ablation ◽  
High Power ◽  
Thermal Imaging ◽  
Laser Processing ◽  
Removal Rate ◽  
Average Power ◽  
Pulsed Laser ◽  
Ir Camera ◽  
Laser Systems ◽  
Material Temperature

Abstract The application of pulsed laser systems with pulse durations in the pico- and femtosecond regime for material processing is commonly associated with a cold ablation. Due to the minimized interaction-time between the ultrashort laser pulses and the material, this statement is almost valid as long as no heat accumulation effect appears. With the increasing demand of high productivity processes, the average power of ultrashort pulsed laser systems increases above 100 W, which leads, however, to increased thermal effects during laser processing. This is especially important for laser processing of technical ceramics like alumina. Large temperatures gradients, which locally occur during laser processing using high average power could lead to thermal modifications and cracks in the material. In this study, we present a process-optimization method for high power laser ablation of alumina based on thermal imaging. The use of a 2D IR camera enables the estimation of the temperature distribution during the laser processing. We investigate the influence of laser power up to 80 W, pulse duration between 900 fs and 10 ps and processing duration on the resulting material temperature. Beside the material temperature we evaluate the material removal rate and the resulting surface quality.

High power continuous and quasi-continuous wave InGaAsP/InP broad-waveguide separate confinement-heterostructure multiquantum well diode lasers

1997 ◽  
Vol 33 (19) ◽  
pp. 1635 ◽  
Author(s):  
D.Z. Garbuzov ◽  
R.J. Menna ◽  
R.U. Martinelli ◽  
J.H. Abeles ◽  
J.C. Connolly
Keyword(s):  
High Power ◽  
Continuous Wave ◽  
Diode Lasers ◽  
Multiquantum Well

scholarly journals Optimized Growth and Laser Application of Yb:LuAG Single-Crystal Fibers by Micro-Pulling-Down Technique

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 78
Author(s):  
Anye Wang ◽  
Jian Zhang ◽  
Shuai Ye ◽  
Xiaofei Ma ◽  
Baiyi Wu ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Power ◽  
Slope Efficiency ◽  
Continuous Wave ◽  
Beam Quality ◽  
Axial Direction ◽  
Optical Quality ◽  
Central Wavelength ◽  
High Power Lasers ◽  
Crystal Fibers

Single-crystal fibers (SCFs) have a great application potential in high-power lasers due to their excellent performance. In this work, high-quality and crack-free Yb3+:Lu3Al5O12 (Yb:LuAG) SCFs were successfully fabricated by the micro-pulling-down (μ-PD) technology. Based on the laser micrometer and the X-ray Laue diffraction results, these Yb:LuAG SCFs have a less than 5% diameter fluctuation and good crystallinity along the axial direction. More importantly, the distribution of Yb ions is proved to be uniform by electron probe microanalysis (EPMA) and the scanning electron microscope (SEM). In the laser experiment, the continuous-wave (CW) output power using a 1 mm diameter Yb:LuAG single-crystal fiber is determined to be 1.96 W, at the central wavelength of 1047 nm, corresponding to a slope efficiency of 13.55%. Meanwhile, by applying a 3 mm diameter Yb:LuAG SCF, we obtain a 4.7 W CW laser output at 1049 nm with the slope efficiency of 22.17%. The beam quality factor M2 is less than 1.1 in both conditions, indicating a good optical quality of the grown fiber. Our results show that the Yb:LuAG SCF is a potential solid-state laser gain medium for 1 μm high-power lasers.

Large Mode Area Solid-Core Photonic Bandgap Yb-doped Fiber with Hetero-Structured Cladding for Compact High-Power Laser Systems

2021 ◽  
pp. 1-1
Author(s):  
Olivier Vanvincq ◽  
Andy Cassez ◽  
Remi Habert ◽  
Hicham El Hamzaoui ◽  
Karen Baudelle ◽  
...  
Keyword(s):  
High Power ◽  
Photonic Bandgap ◽  
Solid Core ◽  
High Power Laser ◽  
Power Laser ◽  
Large Mode Area ◽  
Laser Systems ◽  
Mode Area
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