Generation of propagation-invariant light beams from semiconductor light sources

Sokolovskiĭ, G. S.; Dudelev, V. V.; Losev, S. N.; Zolotovskaya, Svetlana; Deryagin, A. G.; Kuchinskiĭ, V. I.; Rafailov, Edik U.; Sibbett, W.

doi:10.1134/s1063785008120262

Cited by 27 publications

(14 citation statements)

References 6 publications

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“…For a long time, it was believed that the main condition for generation of non-diffracting light fields is the coherence of light but recently it was shown that non-diffracting beams can be formed from low-coherent light sources 7 and that the spatial rather than the temporal coherence of the light source plays the crucial role in formation of Bessel beams 8 . This fact is illustrated in the fig.1 where the Bessel beam generated from the multimode vertical-cavity surface-emitting laser (VCSEL) is presented.…”

Section: Generation Of Bessel Beams From Semiconductor Lasersmentioning

confidence: 99%

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Non-diffracting beams from surface-emitting lasers

et al. 2012

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We present an overview of recent advances in generation of non-diffracting (Bessel) beams from surface-emitting lasers, such as electrically and optically pumped VECSELs, and discuss their applications in optical trapping/tweezing and manipulation of micromachines. Our experiments on VECSEL-generated watt power level Bessel beams with central lobe diameters of a few to tens micrometers suggest that the semiconductor surface-emitting lasers are the best candidates for replacement of gas and solid-state counterparts for power-demanding applications in optical manipulation.

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Section: Generation Of Bessel Beams From Semiconductor Lasersmentioning

confidence: 99%

“…Bessel beam generated from the vertical-cavity surface-emitting laser (VCSEL) with 170 0 axicon: a) transverse profile, b) VCSEL spectrum[8].…”

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confidence: 99%

Non-diffracting beams from surface-emitting lasers

et al. 2012

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“…Among these sources, light-emitting diodes (LEDs) require further attention because of their intermediate spatial and temporal coherence, and rapidly growing practical use. 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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“…Recently, the idea of 'superfocusing' for high-M 2 beams was proposed [11] and demonstrated experimentally [12]. Superfocusing relies on a technique developed for the generation of so-called Bessel beams from laser diodes using a cone-shaped lens (axicon) [13][14][15][16]. This type of non-diffracting beam (i.e.…”

Section: Superfocusing Of Beams With High Propagation Parameter Mmentioning

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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Generation of propagation-invariant light beams from semiconductor light sources

Cited by 27 publications

References 6 publications

Non-diffracting beams from surface-emitting lasers

Non-diffracting beams from surface-emitting lasers

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

Optical trapping with superfocused high-M²laser diode beam

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Generation of propagation-invariant light beams from semiconductor light sources

Cited by 27 publications

References 6 publications

Non-diffracting beams from surface-emitting lasers

Non-diffracting beams from surface-emitting lasers

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

Optical trapping with superfocused high-M2laser diode beam

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Product

Resources

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Optical trapping with superfocused high-M²laser diode beam