High-temperature diode laser pumps for low SWaP directed energy lasers (Conference Presentation)

2018 ◽  
Author(s):  
Manoj Kanskar ◽  
Ling Bao ◽  
Zhigang Chen ◽  
Mark DeVito ◽  
Mike Grimshaw ◽  
...  
Keyword(s):  
High Temperature ◽  
Diode Laser ◽  
Directed Energy

High-temperature diode laser pumps for directed energy fiber lasers (Conference Presentation)

2017 ◽  
Author(s):  
Manoj Kanskar ◽  
Ling Bao ◽  
Zhigang Chen ◽  
Mark DeVito ◽  
Weimin Dong ◽  
...  
Keyword(s):  
High Temperature ◽  
Diode Laser ◽  
Fiber Lasers ◽  
Directed Energy

scholarly journals Excellent superelasticity in a Co-Ni-Ga high-temperature shape memory alloy processed by directed energy deposition

2020 ◽  
Vol 8 (8) ◽  
pp. 314-320
Author(s):  
C. Lauhoff ◽  
N. Sommer ◽  
M. Vollmer ◽  
G. Mienert ◽  
P. Krooß ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Energy Deposition ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals The Reinforcement Mechanisms of Graphene Oxide in Laser Directed Energy Deposition Fabricated Metal and Ceramic Matrix Composites: A Comparison Study

2021 ◽  
Author(s):  
Yunze Li ◽  
Dongzhe Zhang ◽  
Zhipeng Ye ◽  
Gaihua Ye ◽  
Rui He ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
High Temperature ◽  
Metal Matrix ◽  
Energy Deposition ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Directed Energy ◽  
Carbon Based Nanomaterials

Abstract Carbon-based nanomaterials mainly including carbon nanotubes (CNTs), graphene, and graphene oxide (GO) have superior properties of low density, outstanding strength, and high hardness. Compared with ceramic reinforcements, a small amount of carbon-based nanomaterials can significantly improve the mechanical properties of metal matrix composites (MMCs) and ceramic matrix composites (CMCs). However, CNTs and graphite always aggregate or degrade during the fabrication with a high temperature, especially in MMCs. GO has the advantages of easier to be dispersed in other materials and better high-temperature stability. Laser directed energy deposition (DED), has been used to fabricate GO-MMCs and GO-CMCs due to the unique capabilities of coating, remanufacturing, and producing functionally graded materials. Laser DED, as a fusion manufacturing process, could fully melt the material powders, which could refine the microstructure and increase the density and mechanical properties. However, GO could react with matrix materials at high temperatures. The survival, degradation, and reactions of GO in laser DED fabricated GO-MMCs and GO-CMCs are still unknown. There is also no investigation on the reinforcement mechanisms of GO in metal matrix materials and ceramic matrix materials in the laser DED process. In this study, GO reinforced Ti (GO-Ti) and GO reinforced zirconia toughened alumina (GO-ZTA) parts were fabricated by laser DED process. Raman spectrum, XRD analysis, and EDS analysis have been applied to investigate the forms of GO in both DED fabricated GO-MMCs and GO-CMCs. The reinforcement mechanisms of GO on microhardness and compressive properties of MMCs and CMCs have been analyzed.

CO Concentration Measurement in the High Temperature Flame With Tunable Diode Laser Absorption Spectroscopy

2011 ◽  
Author(s):  
Ting Xu ◽  
Fei Wang ◽  
Zhishen Jiang ◽  
Jianhua Yan ◽  
Kefa Cen ◽  
...  
Keyword(s):  
High Temperature ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Equivalence Ratio ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Co Concentration ◽  
Diode Laser Absorption ◽  
Combustion Environment

CO concentration real-time monitoring in combustion process has great significance in improving combustion efficiency and controlling combustion emissions. No CO-spectroscopy solid state sensors are available at the high temperature of 1600K–2000K in the flames. Gas sensing based on tunable diode laser absorption spectroscopy (TDLAS) with the advantages of high sensitivity, high selectivity, quick response and non-intrusiveness offers the possibility for on-line measurement in combustion environment. CO absorption line located at 2302.12nm is selected for measurement by direct absorption method in premixed C3H8/Air flat flame. Experiment results show that, when equivalence ratio is larger than one, the concentration of CO in the flame is increased with the increase of equivalence ratio. It proves that this method can be used on combustion environment.

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