Precise shaping of laser light by an acousto-optic deflector

Trypogeorgos, D.; Harte, Tiffany; Bonnin, Alexis; Foot, C. J.

doi:10.1364/oe.21.024837

Cited by 52 publications

(38 citation statements)

References 30 publications

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“…Experiments have been performed with discrete arrays of optical dipole traps, loaded with either thermal atoms [4,5] or quantum degenerate atomic gases [3,6,7], in which individual trapping sites can be moved, addressed and manipulated. Important too are continuous trapping geometries: the primary subject of the present work are extended (as opposed to diffractionlimited) power-law potentials, proposed both as a static supplement to a trapping potential to cancel unwanted external potentials [8], and in a dynamic sequence as a tool for the efficient production of Bose-Einstein condensates [9]. Other interesting continuous potentials include engineered waveguides with dynamic bright regions, shown to be suitable for studies of BEC superfluidity [10].…”

Section: Introductionmentioning

confidence: 99%

“…Technologies employed so far in the realisation of these arbitrary optical trapping patterns include acousto-optic deflection of a laser beam to produce either a composite static intensity distribution [8] or a rapidly-scanned profile [3,7,11], digital micro-mirror devices (DMDs) [4], and computer-generated holograms implemented with phase-only spatial light modulators (SLMs) [5,6,9,10,[12][13][14][15]. The high phase-resolution available in phase-only SLMs offers significant advantages for versatility of the accessible trapping patterns, though at the cost of lower switching speed between frames if compared to acousto-optic modulators and digital mirror devices.…”

Section: Introductionmentioning

confidence: 99%

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Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Harte¹,

Bruce²,

Keeling³

et al. 2014

Opt. Express

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Direct minimisation of a cost function can in principle provide a versatile and highly controllable route to computational hologram generation. However, to date iterative Fourier transform algorithms have been predominantly used. Here we show that the careful design of cost functions, combined with numerically efficient conjugate gradient minimisation, establishes a practical method for the generation of holograms for a wide range of target light distributions. This results in a guided optimisation process, with a crucial advantage illustrated by the ability to circumvent optical vortex formation during hologram calculation. We demonstrate the implementation of the conjugate gradient method for both discrete and continuous intensity distributions and discuss its applicability to optical trapping of ultracold atoms. References and links1. I. Bloch, J. Dalibard, and S. Nascimbene, "Quantum simulations with ultracold quantum gases," Nat Phys 8, 267-276 (2012). 2. A. D. Cronin, J. Schmiedmayer, and D. E. Pritchard, "Optics and interferometry with atoms and molecules," Rev.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Harte¹,

Bruce²,

Keeling³

et al. 2014

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, the mass range for LA-MS is limited between masses similar to the coolant ion-as low as 2 Da for LA-MS[Be + ] [41]-up to ∼ 10 3 Da. This includes volatile organic compounds, the amino acids, explosive agents, and some peptides; modifications may extend the mass range to include heavier biomolecules such as nucleic acids [38,42].…”

Section: Discussionmentioning

confidence: 99%

Laser-Cooling-Assisted Mass Spectrometry

et al. 2014

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Mass spectrometry is used in a wide range of scientific disciplines including proteomics, pharmaceutics, forensics, and fundamental physics and chemistry. Given this ubiquity, there is a worldwide effort to improve the efficiency and resolution of mass spectrometers. However, the performance of all techniques is ultimately limited by the initial phase-space distribution of the molecules being analyzed. Here, we dramatically reduce the width of this initial phase-space distribution by sympathetically cooling the input molecules with laser-cooled, co-trapped atomic ions, improving both the mass resolution and detection efficiency of a time-of-flight mass spectrometer by over an order of magnitude. Detailed molecular dynamics simulations verify the technique and aid with evaluating its effectiveness. Our technique appears to be applicable to other types of mass spectrometers.

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“…LCoS-SLM is based on the individual manipulation of the refractive index of pixels of a liquid crystal display, while acousto-optic beam shaping (AOS) is based on a fast variation of an acoustic wave enabling a spatially dependent phase variation of laser beams. The AOS technology enables wavefront shaping [11] particularly for 3D nonlinear microscopy [12] and intensity profile shaping [13].…”

Section: Introductionmentioning

confidence: 99%

Tailored laser beam shaping for efficient and accurate microstructuring

et al. 2018

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Large-area processing with high material removal rates by ultrashort pulsed (USP) lasers is coming into focus by the development of high-power USP laser systems. However, currently the bottleneck for high-rate production is given by slow and inefficient beam manipulation. On the one hand, slow beam deflection with regard to high pulse repetition rates leads to heat accumulation and shielding effects, on the other hand, a conventional focus cannot provide the optimum fluence due to the Gaussian intensity profile. In this paper, we emphasize on two approaches of dynamic laser beam shaping with liquid crystal on silicon spatial light modulation and acousto-optic beam shaping. Advantages and limitations of dynamic laser beam shaping with regard to USP laser material processing and methods for reducing the influence of speckle are discussed. Additionally, the influence of optics induced aberrations on speckle characteristics is evaluated. Laser material processing results are presented correlating the achieved structure quality with the simulated and measured beam quality. Experimental and analytical investigations show a certain fluence dependence of the necessary number of alternative holograms to realize homogeneous microstructures.

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Precise shaping of laser light by an acousto-optic deflector

Cited by 52 publications

References 30 publications

Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Laser-Cooling-Assisted Mass Spectrometry

Tailored laser beam shaping for efficient and accurate microstructuring

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