The production of multiringed Laguerre-Gaussian modes by computer-generated holograms

Arlt, Jochen; Dholakia, Kishan; Allen, L.; Padgett, Miles J.

doi:10.1080/095003498151357

Cited by 75 publications

(84 citation statements)

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“…This was soon followed by the demonstration of a spiral phase plate (SPP) operating at optical wavelength [12] and at milimeter range [13] for creating helical-wavefront to directly transform Gaussian beam to OAM beams. At the same time, computer-generated holograms with pitchfork structures were applied using a spatial light modulator (SLM) to convert Gaussian beams into LG beams [3,14]. Different from the astigmatic mode converter, both SPP and SLM are not pure mode converters.…”

Section: Introductionmentioning

confidence: 99%

Position measurement of non-integer OAM beams with structurally invariant propagation

2012

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We present a design to generate structurally propagation invariant light beams carrying non-integer orbital angular momentum (OAM) using Hermite-Laguerre-Gaussian (HLG) modes. Different from previous techniques, the symmetry axes of our beams are fixed when varying the OAM; this simplifies the calibration technique for beam positional measurement using a quadrant detector. We have also demonstrated analytically and experimentally that both the OAM value and the HLG mode orientation play an important role in the quadrant detector response. The assumption that a quadrant detector is most sensitive at the beam center does not always hold for anisotropic beam profiles, such as HLG beams.

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Section: Introductionmentioning

confidence: 99%

Position measurement of non-integer OAM beams with structurally invariant propagation

2012

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“…Many techniques are presently available to generate a higher-order LG p mode from a laser emitting an LG 0 0 beam. Cylindrical mode converters [19] can transform higher-order Hermite-Gauss beams [9] into higher-order LG p beams, using astigmatic lenses; spiral phase plates [20] are optics whose varying thickness induce the typical LG p spiralling phase pattern into the input beam; diffractive optics, which include computer generated holograms [21], spatial light modulators [22] and etched-glass diffractive optics [23] can modulate the amplitude and the phase of the incoming beam to obtain a higher-order LG p mode.…”

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confidence: 99%

Higher-Order Laguerre-Gauss Mode Generation and Interferometry for Gravitational Wave Detectors

et al. 2010

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We report on the first experimental demonstration of higher-order Laguerre-Gauss (LG(p)(ℓ)) mode generation and interferometry using a method scalable to the requirements of gravitational wave (GW) detection. GW detectors which use higher-order LG(p)(ℓ) modes will be less susceptible to mirror thermal noise, which is expected to limit the sensitivity of all currently planned terrestrial detectors. We used a diffractive optic and a mode-cleaner cavity to convert a fundamental LG(0)(0) Gaussian beam into an LG(3)(3) mode with a purity of 98%. The ratio between the power of the LG(0)(0) mode of our laser and the power of the LG(3)(3) transmitted by the cavity was 36%. By measuring the transmission of our setup using the LG(0)(0), we inferred that the conversion efficiency specific to the LG(3)(3) mode was 49%. We illuminated a Michelson interferometer with the LG(3)(3) beam and achieved a visibility of 97%.

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“…The simplest way to generate a Laguerre-Gaussian donut mode (i.e., LG l p=0 ) is to apply an additional phase wrap to the hologram Φ LG = mφ , where φ is the polar angle on the SLM and m = ±l is an integer denoting the azimuthal index 19,20 . This approach, however, does not produce a pure LG donut mode, rather it generates a superposition of higher-order radial p modes for a given azimuthal mode l. The result is a series of concentric, annular rings, albeit with the majority of the power in the p = 0 mode.…”

Section: Wavefront Engineeringmentioning

confidence: 99%

Pinhole Optical Tweezers: Extending the Photobleaching Lifetime in the Presence of an Optical Trap by Wavefront Engineering

Zhang

Milstein

2019

Preprint

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We present a new method for combining optical tweezers with single-molecule fluorescence in an engineered geometry we have coined a 'pinhole' optical trap. By utilizing an appropriately constructed Laguerre-Gaussian (LG) or 'donut' beam, and applying force along the axis of the trapping laser, one can maintain a low-intensity region of near-infrared (IR) light directly below the optical trap in which a biomolecule may be probed by both force spectroscopy and fluorescence. We show that within this region of low IR light intensity, the photobleaching lifetime of Alexa-647, an organic dye that is particularly sensitive to the high intensity trap light, can be significantly extended. This approach enables us to spatially separate the trap light from the fluorescence illumination without the need to physically separate, by many micrometers, the optical trap from the biological sample. A D C B E

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The production of multiringed Laguerre-Gaussian modes by computer-generated holograms

Cited by 75 publications

References 0 publications

Position measurement of non-integer OAM beams with structurally invariant propagation

Position measurement of non-integer OAM beams with structurally invariant propagation

Higher-Order Laguerre-Gauss Mode Generation and Interferometry for Gravitational Wave Detectors

Pinhole Optical Tweezers: Extending the Photobleaching Lifetime in the Presence of an Optical Trap by Wavefront Engineering

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