Laser structuring of metallic mold inserts by using μs, ns, and ps-laser ablation

2012 ◽  
Author(s):  
Steffen G. Scholz ◽  
Alexander Kolew ◽  
Christian Griffiths
Keyword(s):  
Laser Ablation ◽  
Metallic Mold ◽  
Laser Structuring

Rapid Manufacturing of Microwave Circuits on Low-Cost Substrates Using Laser Machining

2013 ◽  
Vol 371 ◽  
pp. 200-204 ◽  
Author(s):  
Mehdi Ghulam ◽  
An Yong Hu ◽  
Jun Gang Miao ◽  
Lorelei Gherman
Keyword(s):  
Laser Ablation ◽  
Low Cost ◽  
Microwave Circuits ◽  
Laser Machining ◽  
Ablation Process ◽  
Promising Alternative ◽  
Laser Ablation Process ◽  
Planar Structures ◽  
Laser Structuring ◽  
Manufacturing Tolerances

Microwave and millimeter wave (MMW) planar structures are sensitive to printed circuit manufacturing tolerances. A promising alternative to the conventional photolithographic fabrication technique is laser structuring. This paper presents the study and the experiments conducted to investigate the possibility of employing low-cost commercially available substrates for microwave and MMW circuits using laser ablation process. At least two of such materials (a) glass reinforced ceramic filled teflon (PTFE) and (b) glass reinforced hydrocarbon have been used to design and fabricate microwave and MMW passive structures such as edge-coupled bandpass filter (BPF) using laser machining. The experimental results exhibit the suitability of glass reinforced hydrocarbon materials for microwave circuits employing laser ablation process. However, it is deduced that the laser ablation process alters the complex permittivity characteristics of the ceramic filled PTFE materials. The measured results of laser ablated passive structures on both materials are presented along with the simulation results.

High Resolution LTCC Laser Processing in the Green and Fired State for Future Technologies

2016 ◽  
Vol 2016 (CICMT) ◽  
pp. 000103-000106 ◽  
Author(s):  
Nam Gutzeit ◽  
Tilo Welker ◽  
Karl-Heinz Drüe ◽  
Jens Müller
Keyword(s):  
Laser Ablation ◽  
High Resolution ◽  
Laser Processing ◽  
Laser Scanning ◽  
Statistical Evaluation ◽  
Laser Scanning Microscopy ◽  
Process Chain ◽  
Uv Laser ◽  
Laser Structuring ◽  
Future Technologies

Abstract In this publication the results of laser structuring processes of LTCC substrates, screen printed and laser structured gold thick film lines and the processing procedures are presented. To investigate the compatibility of the laser processes into the conventional LTCC process chain the laser structuring was done in green as well as in fired state. Typical easy electrical patterns like miniaturized interdigital structures and meanders serve as examples of the reached resolution and geometrical borders of the laser structuring techniques at the Center of Micro- and Nanotechnologies of the TU Ilmenau (IMN Macro Nano®). The lateral precision and the topological shape are determined by laser scanning microscopy. The aimed structures have lines and spaces of 30 μm. A statistical evaluation is done to show the possibilities and the limits of the new laser structuring processes with picosecond UV laser ablation systems.

Observations on the growth of YBa2Cu3O7-δ thin films on MgO by pulsed-laser ablation

1991 ◽  
Vol 49 ◽  
pp. 1068-1069
Author(s):  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Ablation ◽  
Substrate Surface ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Laser Ablation Process ◽  
Deposition Parameters

Pulsed-laser ablation has been widely used to produce high-quality thin films of YBa2Cu3O7-δ on a range of substrate materials. The nonequilibrium nature of the process allows congruent deposition of oxides with complex stoichiometrics. In the high power density regime produced by the UV excimer lasers the ablated species includes a mixture of neutral atoms, molecules and ions. All these species play an important role in thin-film deposition. However, changes in the deposition parameters have been shown to affect the microstructure of thin YBa2Cu3O7-δ films. The formation of metastable configurations is possible because at the low substrate temperatures used, only shortrange rearrangement on the substrate surface can occur. The parameters associated directly with the laser ablation process, those determining the nature of the process, e g. thermal or nonthermal volatilization, have been classified as ‘primary parameters'. Other parameters may also affect the microstructure of the thin film. In this paper, the effects of these ‘secondary parameters' on the microstructure of YBa2Cu3O7-δ films will be discussed. Examples of 'secondary parameters' include the substrate temperature and the oxygen partial pressure during deposition.

153: Successful Gold Nanoshell Assisted Laser Ablation of Prostate Carcinoma in Vitro

2007 ◽  
Vol 177 (4S) ◽  
pp. 52-52
Author(s):  
Joshua M. Stem ◽  
Jer-Tsang Hsieh ◽  
Sangtae Park ◽  
Yair Lotan ◽  
Jeffrey A. Cadeddu
Keyword(s):  
Laser Ablation ◽  
Prostate Carcinoma ◽  
Gold Nanoshell
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