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Femtosecond Diffractometry

#1280


Femtosecond Photoelectronic Diffractometry Measurement Techniques

Tech Area / Field

  • INS-MEA/Measuring Instruments/Instrumentation
  • PHY-ANU/Atomic and Nuclear Physics/Physics
  • PHY-OTH/Other/Physics

Status
8 Project completed

Registration date
20.05.1998

Completion date
08.04.2003

Senior Project Manager
Horowicz L

Leading Institute
Institute of General Physics named after A.M. Prokhorov RAS, Russia, Moscow

Supporting institutes

  • NIIIT (Pulse Techniques), Russia, Moscow\nVNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Institut Franco-Allemand de Recherches de Saint-Lous, France, Saint-Louis\nCORDIN Co., USA, UT, Salt Lake City\nCalifornia Institute of Technology, USA, CA, Pasadena

Project summary

The submitted Project (Femtosecond Photoelectronic Diffractometry Measurement Techniques) is the extention of the ISTC #037-94 Project which was realized from 1st of December 1994 up to 28th of February 1998, and aimed to develop and manufacture an instrumentation technique which permits direct investigation both the materia physical-chemical properties on atomic-molecular level and the duration of transient events which does not exceed a trillionth of a second. Femtosecond photoelectronic gun (FPG) as the key component of the diffractometry installation was created during the #037-94 Project activity. Its temporal resolution is about 500 fs, and demonstration experiments on diffraction of femtoseconds 30 KeV-pulses on the Al target with 300 thickness in transmission mode were fulfilled with this instrument. All these results were presented during the 22nd International Congress on High-Speed Photography and Photonics (22nd of October, 1996 – 1st of November, 1996, Santa-Fe, N.M., USA), the 20th International Conference on Quantum Elelctronics, 14-19 July, 1996, Sydney, Australia, All-Russian Conference on High-Speed Photography and Photonics (26-27 November, 1997, Moscow) as well as the 3d Japanese Symposium on High-Speed Photography and Photonics (Tokyo, 16-18 December, 1997) and published in the Proceedings of these Symposia. The paper was submitted for Rev. Sci. Instr. (26th Dec 1997) and Optical Engineering (27th Feb 1998) and we applied for a Patent in December 1997.

The presented project aimed to continue our (General Physics Institute and other participating institutions and foreign collaborators) activities in the FPG parameters improvement. We intend to achieve the photoelectron gun temporal resolution at the level of 100 fs and to create an experimental prototype of the diffractometer in order to measure the FPG dynamic parameters. This permits to realize a seria of test experiments on time-resolved electron diffraction (TRED) with using not only solid-state targets, but also gaseus ones.

Among the primary tasks which have to be solved during this new Project implementation are the followings:


· computer modelling of the femtosecond photoelectron gun capable to provide 100 fs time resolution;
· technology problems handling for successful manufacturing of the sealed-off and continuosly-pumped FPG experimental prototypes;
· assembling of the femtosecond diffractometry installation for providing test experiments with solid-state and gas-phase targets;
· software development for diffractometric pictures reconstruction;
· designing of some components needed to realize a commercial prototype of the femtosecond diffractometer.

The final step of this Project has to include some approaches in manufacturing a commercial prototype of the fs-diffractometer ready to be deliverable to any of the user throught the world.

Among foreign collaborators for the Project is Prof. A.Zewail NSF Molecular Science Laboratory at California Institute of Technology. This Laboratory has accumulated a great potential in picosecond gas diffractometry, and now ready to employ femtosecond source of electrons which will be developed within the frame of the project. American Cordin Company will provide interface between Russian and US technologies taking into consideration various commercialization aspects.


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