Navigation Links
Research could improve laser-manufacturing technique
Date:12/19/2011

WEST LAFAYETTE, Ind. ╨ Engineers have discovered details about the behavior of ultrafast laser pulses that may lead to new applications in manufacturing, diagnostics and other research.

Ultrafast laser pulses are used to create features and surface textures in metals, ceramics and other materials for applications including the manufacture of solar cells and biosensors. The lasers pulse at durations of 100 femtoseconds, or quadrillionths of a second, and cause electrons to reach temperatures greater than 60,000 degrees Celsius during the pulse duration. The pulses create precise patterns in a process called "cold ablation," which turns material into a plasma of charged particles.

Images taken with a high-speed camera show tiny mushroom clouds eerily similar in appearance to those created in a nuclear explosion. The clouds expand outward at speeds of 100 to 1,000 times the speed of sound within less than one nanosecond. However, new findings reveal that an earlier cloud forms immediately before the mushroom cloud, and this early plasma interferes with the laser pulses, hindering performance, said Yung Shin, a professor of mechanical engineering and director of Purdue University's Center for Laser-Based Manufacturing.

Finding a way to eliminate the interference caused by the early plasma could open up new applications in manufacturing, materials and chemical processing, machining and advanced sensors to monitor composition, and chemical and atomic reactions on an unprecedented scale, he said.

Researchers used experiments and simulations to study the phenomenon. Research papers about the work were published online Dec. 6 in Applied Physics Letters and in September in the journal Physics of Plasmas. The papers were written by doctoral student Wenqian Hu, Shin and mechanical engineering professor Galen King.

"We found the formation of early plasma has very significant bearing on the use of ultrashort pulse lasers because it partially blocks the laser beam," Shin said. "The early plasma changes the optical properties of air, but the mechanism is still largely unknown."

The researchers studied the early plasma by tracking the movement of millions of individual atoms in the plasma; observing how the laser beam travels in space and interacts with plasma; and using a "laser pump probe shadowgraph," a technique in which one laser ablates a material, producing the early plasma, and a second laser fired perpendicular to the first is used to study the cloud. A series of optical elements and mirrors is used in the shadowgraph technique.


'/>"/>

Contact: Emil Venere
venere@purdjue.edu
765-494-4709
Purdue University
Source:Eurekalert

Related biology technology :

1. NIH Funds $1M Research at Quest Product Development and University of Colorado for New Digitally-Controlled Endoscopes
2. Canopus Biopharma and Leading Chinese Researcher Team Up to Treat Avian Influenza, to Prevent Possible Pandemic
3. Association of Clinical Research Organizations (ACRO) Welcomes Clinilabs and RPS as New Members
4. Melior Enters Research Collaboration with AstraZeneca
5. UC Riverside researcher develops novel method to grow human embryonic stem cells
6. Crystal Research Associates, LLC Issues Executive Informational Overview(R) (EIO(R)) on Generex Biotechnology Corporation
7. Cryo-Cell International and EndGenitor Technologies Announce Research Collaboration
8. US Oncology Appoints Stephen Smith Vice President/General Manager Research and Personalized Science Services
9. Cyntellect to Collaborate With the Burnham Institute for Medical Research
10. Memory Pharmaceuticals Closes Final Tranche of Equity Financing with The Stanley Medical Research Institute
11. MD Anderson Becomes a GeneGo Center of Excellence Using MetaCore for Oncology Research
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/17/2017)... ... August 17, 2017 , ... CNA Finance ... had provided a research update on Aytu Bioscience and cited promising increases in ... to Soulstring, prescription rates for Natesto® have more than doubled since March of ...
(Date:8/16/2017)... ... August 16, 2017 , ... Tunnell Consulting announced today ... the ISPE Annual Meeting and Expo , to be held October 29 through ... theme is “Driving innovation to advance patient therapies.” , The ISPE Annual Meeting and ...
(Date:8/16/2017)... ... August 16, 2017 , ... Recent studies show that ... treatments for specific cancers, such as breast, prostate, or lung, target vital pathways ... therapy for advanced prostate cancer. , This therapy limits the production and ...
(Date:8/16/2017)... ... August 16, 2017 , ... Today, ... it has secured $2M in funding from an impressive group of investors, including ... SVG Thrive Fund. With this investment, 3Bar is broadening availability of its groundbreaking ...
Breaking Biology Technology:
(Date:4/5/2017)... 5, 2017  The Allen Institute for Cell Science ... a one-of-a-kind portal and dynamic digital window into the ... the first application of deep learning to create predictive ... lines and a growing suite of powerful tools. The ... and future publicly available resources created and shared by ...
(Date:3/30/2017)... LOS ANGELES , March 30, 2017  On ... Hack the Genome hackathon at ... This exciting two-day competition will focus on developing health ... experience. Hack the Genome is ... has been tremendous. The world,s largest companies in the ...
(Date:3/27/2017)... March 27, 2017  Catholic Health Services (CHS) ... Systems Society (HIMSS) Analytics for achieving Stage 6 ... sm . In addition, CHS previously earned a ... using an electronic medical record (EMR). ... level of EMR usage in an outpatient setting.  ...
Breaking Biology News(10 mins):