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dc.contributor.authorSokolovskii, G. S.
dc.contributor.authorDudelev, V. V.
dc.contributor.authorMelissinaki, V.
dc.contributor.authorLosev, S. N.
dc.contributor.authorSobolev, K. K.
dc.contributor.authorDeryagin, A. G.
dc.contributor.authorKuchinskii, V. I.
dc.contributor.authorFarsari, M.
dc.contributor.authorSibbett, W.
dc.contributor.authorRafailov, E. U.
dc.contributor.editorKudryashov, AV
dc.contributor.editorPaxton, AH
dc.contributor.editorIlchenko, VS
dc.contributor.editorAschke, L
dc.contributor.editorWashio, K
dc.identifier.citationSokolovskii , G S , Dudelev , V V , Melissinaki , V , Losev , S N , Sobolev , K K , Deryagin , A G , Kuchinskii , V I , Farsari , M , Sibbett , W & Rafailov , E U 2015 , Optical trapping with superfocused high-M 2 laser diode beam . in AV Kudryashov , AH Paxton , VS Ilchenko , L Aschke & K Washio (eds) , Laser Resonators, Microresonators, and Beam Control XVII . Proceedings of SPIE , vol. 9343 , SPIE , Bellingham , Conference on Laser Resonators, Microresonators, and Beam Control XVII , Canada , 9/02/15 .
dc.identifier.otherPURE: 190820177
dc.identifier.otherPURE UUID: 14ef4b4f-60bd-4ff1-9fd9-2bf35b90f941
dc.identifier.otherWOS: 000353695900012
dc.identifier.otherScopus: 84931367645
dc.identifier.otherWOS: 000353695900012
dc.description.abstractMany applications of high-power laser diodes demand tight focusing. This is often not possible due to the multimode nature of semiconductor laser radiation possessing beam propagation parameter M2 values in double-digits. We propose a method of 'interference' superfocusing of high-M2 diode laser beams with a technique developed for the generation of Bessel beams based on the employment of an axicon fabricated on the tip of a 100 μm diameter optical fiber with highprecision direct laser writing. Using axicons with apex angle 1400 and rounded tip area as small as similar to 10 μm diameter, we demonstrate 2-4 μm diameter focused laser ` needle' beams with approximately 20 mu m propagation length generated from multimode diode laser with beam propagation parameter M2= 18 and emission wavelength of 960 nm. This is a few-fold reduction compared to the minimal focal spot size of ∼11 μm that could be achieved if focused by an 'ideal' lens of unity numerical aperture. The same technique using a 1600 axicon allowed us to demonstrate few-μm-wide laser 'needle' beams with nearly 100 μm propagation length with which to demonstrate optical trapping of 5-6μm rat blood red cells in a water-heparin solution. Our results indicate the good potential of superfocused diode laser beams for applications relating to optical trapping and manipulation of microscopic objects including living biological objects with aspirations towards subsequent novel lab-on-chip configurations.
dc.relation.ispartofLaser Resonators, Microresonators, and Beam Control XVIIen
dc.relation.ispartofseriesProceedings of SPIEen
dc.rightsSokolovskii, G. S., Dudelev, V. V., Melissinaki, V., Losev, S. N., Sobolev, K. K., Deryagin, A. G., Kuchinskii, V. I., Farsari, M., Sibbett, W., & Rafailov, E. U., "Optical trapping with superfocused high-M2 laser diode beam," Laser Resonators, Microresonators, and Beam Control XVII, Kudryashov, A. V., Paxton, A. H., Ilchenko, V. S., Aschke, L., & Washio, K. (Eds.), Proceedings of SPIE 9343 (2015) Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
dc.subjectBessel beamsen
dc.subjectLaser diodesen
dc.subjectOptical manipulationen
dc.subjectSemiconductor light-sourcecsen
dc.subjectQC Physicsen
dc.titleOptical trapping with superfocused high-M2 laser diode beamen
dc.typeConference itemen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen

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