Manifestation of the rotational Doppler effect by use of an off-axis optical vortex beam

Basistiy, I. V.; Slyusar, V. V.; Soskin, M. S.; Vasnetsov, M. V.; Bekshaev, A. Ya.

doi:10.1364/ol.28.001185

Cited by 63 publications

(36 citation statements)

References 9 publications

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“…However, the perfect rotation of a beam is not so straightforward, and it is difficult to isolate the effects of rotation from those arising from slight misalignment [149]. In fact it is easier to use a static approach in which Dove prisms are introduced into each arm of an interferometer.…”

Section: Measuring Oam By Interferometrymentioning

confidence: 99%

Orbital angular momentum: origins, behavior and applications

Yao

Padgett²

2011

Adv. Opt. Photon.

2,660

1,573

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As they travel through space, some light beams rotate. Such light beams have angular momentum. There are two particularly important ways in which a light beam can rotate: if every polarization vector rotates, the light has spin; if the phase structure rotates, the light has orbital angular momentum (OAM), which can be many times greater than the spin. Only in the past 20 years has it been realized that beams carrying OAM, which have an optical vortex along the axis, can be easily made in the laboratory. These light beams are able to spin microscopic objects, give rise to rotational frequency shifts, create new forms of imaging systems, and behave within nonlinear material to give new insights into quantum optics

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Section: Measuring Oam By Interferometrymentioning

confidence: 99%

Orbital angular momentum: origins, behavior and applications

Yao

Padgett²

2011

Adv. Opt. Photon.

2,660

1,573

View full text Add to dashboard Cite

show abstract

“…In order to generate pure LG beams, it was necessary to control both the intensity and the phase of the incident light. This was achieved by adjusting the local contrast on the SLM to shape the intensity of the light beam accordingly [13,14]. Figure 1(b) shows an example of such a computer-generated hologram.…”

Section: Generation Of Helically Phased Beams and The Shack Hartmann mentioning

confidence: 99%

Direct measurement of the skew angle of the Poynting vector in a helically phased beam

Leach¹,

Keen²,

Padgett³

et al. 2006

Opt. Express

131

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Abstract:We measure the local skew angle of the Poynting vector within a helically-phased, exp ilφ ( ) , beam using a Shack Hartmann wavefront sensor.It is the skew angle of the Poynting vector with respect to the beam axis that gives rise to the orbital angular momentum of a light beam. We confirm that this skew angle is l kr , corresponding to an orbital angular momentum of l per photon. Measurement of orbital angular momentum in this way is an alternative to interferometric techniques giving a non-ambiguous result to both the magnitude and sign of l from a single measurement, without any restriction on the optical bandwidth.

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“…Optical angular momentum can also be quantified by measuring the rotational Doppler shift introduced by rotating optical elements in the beam path [21]. The orbital component has been determined by measuring the frequency shift between two beams with different azimuthal indices [22]. In this experiment one of the beams is rotated using a 90 • prism.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the total optical angular momentum transfer in optical tweezers

et al. 2006

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We describe a way to determine the total angular momentum, both spin and orbital, transferred to a particle trapped in optical tweezers. As an example an LG 02 mode of a laser beam with varying degrees of circular polarisation is used to trap and rotate an elongated particle with a well defined geometry. The method successfully estimates the total optical torque applied to the particle. For this technique, there is no need to measure the viscous drag on the particle, as it is an optical measurement. Therefore, knowledge of the particle's size and shape, as well as the fluid's viscosity, is not required.

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Manifestation of the rotational Doppler effect by use of an off-axis optical vortex beam

Cited by 63 publications

References 9 publications

Orbital angular momentum: origins, behavior and applications

Orbital angular momentum: origins, behavior and applications

Direct measurement of the skew angle of the Poynting vector in a helically phased beam

Measurement of the total optical angular momentum transfer in optical tweezers

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