Bessel beams from semiconductor light sources

Sokolovskiĭ, G. S.; Dudelev, V. V.; Losev, S. N.; Soboleva, K.K.; Deryagin, A. G.; Fedorova, Ksenia A.; Kuchinskiĭ, V. I.; Sibbett, W.; Rafailov, Edik U.

doi:10.1016/j.pquantelec.2014.07.001

Cited by 20 publications

(14 citation statements)

References 43 publications

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“…In our earlier experiments we demonstrated optical trapping with Bessel beams generated from semiconductors lasers [20][21][22]. In this work we utilize a superfocused high-M 2 laser diode beam for optical trapping and manipulation of microscopic biological objects.…”

Section: Methodsmentioning

confidence: 99%

Optical trapping with superfocused high-M²laser diode beam

Sokolovskiĭ¹,

Dudelev²,

Melissinaki

et al. 2015

SPIE Proceedings

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Many 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 M 2 values in double-digits. We propose a method of 'interference' superfocusing of high-M 2 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 140 0 and rounded tip area as small as ~10 μm diameter, we demonstrate 2-4 μm diameter focused laser 'needle' beams with approximately 20 μm propagation length generated from multimode diode laser with beam propagation parameter M 2 =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 160 0 axicon allowed us to demonstrate few-μm-wide laser 'needle' beams with nearly 100 μm propagation length with which to demonstrate optical trapping of 5-6 μm 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.

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Section: Methodsmentioning

confidence: 99%

Optical trapping with superfocused high-M²laser diode beam

Sokolovskiĭ¹,

Dudelev²,

Melissinaki

et al. 2015

SPIE Proceedings

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“…We used three different positive lenses with focal lengths of 15.4, 50, and 100 mm; we set the distance between the pinhole and collimation lens according to these focal lengths. Increasing the focal length of the collimation lens provides beams with larger diameters and longer Bessel zones, as well as larger coherence areas [11].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Various types of LEDs are shown to be capable of forming Bessel beams [10], the depth of the nondiffracting zone being strongly dependent on the emitter profile. In a more extensive work, performances of LEDs and laser-type semiconductor sources (lasers diodes or LDs) are compared [11].…”

Section: Introductionmentioning

confidence: 99%

Propagation characteristics of Bessel beams generated by continuous, incoherent light sources

2015

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We investigate the propagation behavior of Bessel beams generated by incoherent, continuous light sources. We perform experiments with narrowband and broadband light emitting diodes, and, for comparison, with a laser diode. We observe that the formation of Bessel beams is affected minimally by temporal coherence, while spatial coherence determines the longitudinal evolution of the beam profile. With spatially incoherent beams, the fringe contrast is comparable to the coherent case at the beginning of the Bessel zone, while it completely fades away by propagation, turning into a cylindrical light pipe. Our results show that beam shaping methods can be extended to cases of limited spatial coherence, paving the way for potential new uses and applications of such sources.

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“…5. One can observe that the large angle leads to forwardpropagated laser light; moreover, such pointed needle could provide some kind of a Bessel beam of a first order with its benefits of low-diffraction caustic; [55][56][57] in turn the small angle might lead to the extreme light confinement and, thus, to a specific localization of tissue exposure. It is interesting that the needle with l ¼ 2.0 mm combines diffused and forward components simultaneously.…”

Section: Study Of Radiation Patterns Formed By Sapphire Needlesmentioning

confidence: 99%

Optimization of sapphire capillary needles for interstitial and percutaneous laser medicine

et al. 2019

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Sapphire capillary needles fabricated by edge-defined film-fed growth (EFG) technique hold strong potential in laser thermotherapy and photodynamic therapy, thanks to the advanced physical properties of sapphire. These needles feature an as-grown optical quality, their length is tens of centimeters, and they contain internal capillary channels, with open or closed ends. They can serve as optically transparent bearing elements with optical fibers introduced into their capillary channels in order to deliver laser radiation to biological tissues for therapeutic and, in some cases, diagnostic purposes. A potential advantage of the EFG-grown sapphire needles is associated with an ability to form the tip of a needle with complex geometry, either as-grown or mechanically treated, aimed at controlling the output radiation pattern. In order to examine a potential of the radiation pattern shaping, we present a set of fabricated sapphire needles with different tips. We studied the radiation patterns formed at the output of these needles using a He-Ne laser as a light source, and used intralipid-based tissue phantoms to proof the concept experimentally and the Monte-Carlo modeling to proof it numerically. The observed results demonstrate a good agreement between the numerical and experimental data and reveal an ability to control within wide limits the direction of tissue exposure to light and the amount of exposed tissue by managing the sapphire needle tip geometry.

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Bessel beams from semiconductor light sources

Cited by 20 publications

References 43 publications

Optical trapping with superfocused high-M²laser diode beam

Optical trapping with superfocused high-M²laser diode beam

Propagation characteristics of Bessel beams generated by continuous, incoherent light sources

Optimization of sapphire capillary needles for interstitial and percutaneous laser medicine

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Bessel beams from semiconductor light sources

Cited by 20 publications

References 43 publications

Optical trapping with superfocused high-M2laser diode beam

Optical trapping with superfocused high-M2laser diode beam

Propagation characteristics of Bessel beams generated by continuous, incoherent light sources

Optimization of sapphire capillary needles for interstitial and percutaneous laser medicine

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Product

Resources

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Optical trapping with superfocused high-M²laser diode beam

Optical trapping with superfocused high-M²laser diode beam