Coupling of stress of endoplasmatic reticule with oxidative stress in vascular cel...
Implementation and development of Laser Induced Breakdown Spectroscopy (LIBS)
Dr. Zuoqiang Hao visit: study of aerosol optical properties in the city of São Pau...
| Grant number: | 00/15135-9 |
| Support Opportunities: | Research Projects - Thematic Grants |
| Start date: | November 01, 2001 |
| End date: | June 30, 2007 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Condensed Matter Physics |
| Principal Investigator: | Nilson Dias Vieira Junior |
| Grantee: | Nilson Dias Vieira Junior |
| Host Institution: | Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil |
| Pesquisadores principais: | Laercio Gomes ; Sonia Licia Baldochi |
Abstract
The goal of this project is to construct and to use a laser system capable of producing optical pulses with less than 100 fs duration and minimum energy of 100 mJ, thus peak powers of TW, centered at 830 nm The system will be based on a modified commercial laser system that generates peak powers of 10 GW, at 800 nm The main advantage of this class of systems is that it can be contained on the top of an optical table, therefore taking the acronym of T3 systems (Table Top Terawatt systems). The commercial system will be specially modified by the manufacturer, according to our specifications, to operate at 830 nm, matching the maximum emission gain of the Cr:LiSrAIF6 (Cr:LiSAF) crystal. This family of colquerite crystals has been grown by the Center for Lasers and Applications (CLA) since 1995, and we are now ready to obtain large crystals with high optical and mechanical qualities, needed to support the high intensity levels of tens to hundreds of GW/cm2 , existing in this class of lasers. The basic commercial system contains the state-of-the-art of the Chirped Pulse Amplification (CPA) technology.A final amplifying stage will be developed with our home grown Cr:LiSAF crystal and will be added before the pulse temporal compression. For this purpose we count on more than 20 years of experience on the development of solid state lasers based on home grown fluoride crystals, as well as on our familiarity with short pulse systems. This system will become a platform for further developments in which the dimensions and quality of the Cr:LiSAF crystals are determinant for the evolution of this class of lasers. Due to the versatility and the high intensities available from this system, the application areas in which we are working, will benefit and expand with its use. Among these applications is the non thermal ablation of materials. In the processing of materials of technological interest without thermal effects, one of the highlights are the studies of micromachining processes, which preserve the physical properties of the bulk. The result of these studies will be transferred to high technology companies.The ablation of biological tissues with this class of lasers is done without thermal damage to the neighboring structure, what expands its potential uses for surgery. Application in ablation of hard organic tissue as enamel and dentine, or soft one like the skin, can be done with spatial selectivity, preserving the vital parts like the pulp or the epidermis, respectively... (AU)
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