Single beam test (SBT) as a criterion for the resolution of holographic recording

2015 ◽  
Vol 3 (22) ◽  
pp. 5616-5620 ◽  
Author(s):  
Anna Sobolewska ◽  
Stanislaw Bartkiewicz
Keyword(s):  
Laser Beam ◽  
Holographic Recording ◽  
Beam Test ◽  
Single Beam ◽  
Single Laser

Formation of the willow structure resulting from irradiation of a single laser beam limits the resolution of holographic recording.

A Comparison of Characteristics of Periodic Surface Micro/Nano Structures Generated Via Single Laser Beam Direct Writing and Particle Lens Array Parallel Beam Processing

2021 ◽  
Author(s):  
Fatema Rajab ◽  
Anmar K. Al-Jumaily ◽  
Tayf Tariq A.S ◽  
Sorin Laurentiu Stanescu ◽  
Ahmad W. AlShaer ◽  
...  
Keyword(s):  
Laser Beam ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Periodic Surface ◽  
Lens Array ◽  
Single Beam ◽  
Beam Laser ◽  
Nano Structures ◽  
Single Laser ◽  
Surface Patterns

Abstract Changing material surface micro/nano structures using laser beam texturing is a valuable approach in wide applications such as control of cell/bacterial adhesion and proliferation, solar cells and optical metamaterials. Here we report a comparison of the characteristics of surface micro/nano structures produced using single beam laser direct writing and particle lens array parallel laser beam patterning. A Nd:YVO4 nanosecond pulsed laser at 532 nm wavelength was used in the laser direct writing method to texture the stainless steel surface submerged in water and in air with different scanning patterns. Changes in surface morphology, wettability, surface chemistry and optical reflectivity were analyzed. In the particle lens array method, an excimer nanosecond laser at 248 nm wavelength was adopted to produce surface patterns on GeSbTe (GST) film coated on a polycarbonate substrate by splitting and focusing a single laser beam into millions of parallel breams. Single beam laser direct writing shows that the surface of high roughness and oxygen percentage content presented high wettability and low reflectivity characteristics. However, the controllability of the type of surface micro/nano patterns is limited. The parallel laser beam processing using particle lens array allows rapid production of user designed periodic surface patterns at nano-scale overcoming the optical diffraction limit with a high degree of controllability. Controlling the uniformity of the particle lens array is a challenge.

scholarly journals Characterization of dissimilar aluminum-copper material joining by controlled dual laser beam

2021 ◽  
Author(s):  
Joon Ho Cha ◽  
Hae Woon Choi
Keyword(s):  
Laser Beam ◽  
Power Distribution ◽  
Near Infrared ◽  
Weld Zone ◽  
Tensile Tests ◽  
Bead Width ◽  
Single Beam ◽  
The Core ◽  
Beam Laser ◽  
Dual Laser

Abstract Laser technology has many advantages in welding for the manufacture of EV battery packs. Aluminum (Al) and copper (Cu) are welded using a dual laser beam, suggesting the optimum power distribution for the core and ring beams. Due to the very high reflectance of Cu and Al exposed to near-infrared lasers, the material absorbs a very small amount of energy. Compared to single beam laser welding, dual beam welding has significantly improved surface quality by controlling surface solidification. The study focused on the quality of weld surface beads, weld properties and tensile strength by varying the output ratio of the core beam to the ring beam. Optimal conditions of Al6061 were a 700 W core beam, a 500 W ring beam and 200 mm/s of weld speed. For the C1020P, the optimum conditions were a center beam of 2500 W, a ring beam of 3000 W and a welding speed of 200 mm/s. In laser lap welding of Al-Al and Al-Cu, the bead width and the interfacial bead width of the joint increased as the output increased. The penetration depth did not change significantly, but small pores were formed at the interface of the junction. Tensile tests were performed to demonstrate the reliability of the weld zone, and computer simulations provided analysis of the heat distribution for optimal heat input conditions.

Single laser beam based passive optical sorter

2013 ◽  
Author(s):  
O. Brzobohatý ◽  
V. Karasek ◽  
M. Šiler ◽  
L. Chvatal ◽  
T. Cizmar ◽  
...  
Keyword(s):  
Laser Beam ◽  
Single Laser

scholarly journals Laser cooling with a single laser beam and a planar diffractor

2010 ◽  
Vol 35 (20) ◽  
pp. 3453 ◽  
Author(s):  
Matthieu Vangeleyn ◽  
Paul F. Griffin ◽  
Erling Riis ◽  
Aidan S. Arnold
Keyword(s):  
Laser Beam ◽  
Laser Cooling ◽  
Single Laser
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