NDLI: An in-vacuo optical levitation trap for high-intensity laser interaction experiments with isolated microtargets.

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An in-vacuo optical levitation trap for high-intensity laser interaction experiments with isolated microtargets.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Stuart, N. H. Parker, S. Smith, R. A. Lowe, H. F. Patankar, S. Price, C. J. Donnelly, T. D. Gumbrell, E. T. Giltrap, S. Drew, D.
Description	Country affiliation: United kingdom Author Affiliation: Price CJ ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.); Donnelly TD ( Department of Physics, Harvey Mudd College, Claremont, California 91711, USA.); Giltrap S ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.); Stuart NH ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.); Parker S ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.); Patankar S ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.); Lowe HF ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.); Drew D ( Radiation Physics, AWE, Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom.); Gumbrell ET ( Radiation Physics, AWE, Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom.); Smith RA ( Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom.)
Abstract	We report on the design, construction, and characterisation of a new class of in-vacuo optical levitation trap optimised for use in high-intensity, high-energy laser interaction experiments. The system uses a focused, vertically propagating continuous wave laser beam to capture and manipulate micro-targets by photon momentum transfer at much longer working distances than commonly used by optical tweezer systems. A high speed (10 kHz) optical imaging and signal acquisition system was implemented for tracking the levitated droplets position and dynamic behaviour under atmospheric and vacuum conditions, with ±5 µm spatial resolution. Optical trapping of 10 ± 4 µm oil droplets in vacuum was demonstrated, over timescales of >1 h at extended distances of â ¼40 mm from the final focusing optic. The stability of the levitated droplet was such that it would stay in alignment with a â ¼7 µm irradiating beam focal spot for up to 5 min without the need for re-adjustment. The performance of the trap was assessed in a series of high-intensity (10(17) W cm(-2)) laser experiments that measured the X-ray source size and inferred free-electron temperature of a single isolated droplet target, along with a measurement of the emitted radio-frequency pulse. These initial tests demonstrated the use of optically levitated microdroplets as a robust target platform for further high-intensity laser interaction and point source studies.
ISSN	00346748
Issue Number	3
Journal	Review of Scientific Instruments
Volume Number	86
e-ISSN	10897623
Language	English
Publisher	American Institute of Physics
Publisher Date	2015-03-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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
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