Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Nishizawa, Y. Takeda, S. Obara, M. |
| Copyright Year | 2005 |
| Description | Author affiliation: Dept. of Electron. & Electr. Eng., Keio Univ., Yokohama, Japan (Nishizawa, Y.; Takeda, S.; Obara, M.) |
| Abstract | Interest in femtosecond (fs) laser applications in medical fields has been increasing. Many studies which focused on the fs laser ablation processing of biomedical tissues have been reported. The advantages are due to the precise material processing without heat affected zone, and without changing chemical properties of the ablated area. Technical issues of fs laser delivery prevent fs laser processing from endoscopic medical applications. In this paper, a high quality beam delivery using a flexible small-core hollow fiber and the ablation processing of hydroxyapatite (HAp) and collagen with fs laser double pulses through a bend hollow fiber is demonstrated. HAp is a main component of bones and teeth. Two new methods were adopted: one is the use of a hollow fiber with a 320-/spl mu/m core diameter in order to improve the output beam intensity profile by eliminating the high order modes; the other one is an fs double pulse laser transmission scheme with a tailored ps-order delay time, in which the second pulse comes earlier than the ablation onset. Since the optical damage threshold of the hollow fiber depends on the peak intensity of the incident laser pulse, the double pulse transmission enabled the delivery of higher pulse energies than the single pulse even by keeping the fs laser ablation characteristics. By adopting these two new methods, high energy enough to ablate HAp and collagen was delivered. The delivery of a near Gaussian output beam profile and high ablation rates was demonstrated. |
| Starting Page | 110 |
| Ending Page | 111 |
| File Size | 304530 |
| Page Count | 2 |
| File Format | |
| ISBN | 0780392175 |
| DOI | 10.1109/LEOS.2005.1547894 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2005-10-22 |
| Publisher Place | Australia |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Biomedical materials Fiber lasers Laser ablation Optical pulses Chemical lasers Ultrafast optics Laser beams Laser modes Laser applications Materials processing |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|