Ultrashort-pulsed truncated polychromatic Bessel-Gauss beams

Grünwald, R.; Böck, Martin; Kebbel, Volker; Huferath, S.; Neumann, Uwe; Steinmeyer, G.; Stibenz, Gero; Neron, Jean-Luc; Piché, Michel

doi:10.1364/oe.16.001077

Cited by 34 publications

(29 citation statements)

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“…The method of statistical moments can also be applied to intensity distributions as detected in the case of fringe-free BAC signals obtained with needle beams. If the conical angle is small enough, only the central maximum of a Bessel-like beam appears which was referred to as a "needle beam" [24][25][26]. Beside the needle shape, such particular nondiffracting beams are characterized by the very advantageous property to keep their spectral and temporal parameters during the propagation over an extended focal zone (in contrast to, e.g., a Gaussian beam focus).…”

Section: Proposal Of a Fringeless Bessel Autocorrelatormentioning

confidence: 99%

Adaptive Bessel-autocorrelation of ultrashort pulses with phase-only spatial light modulators

Luepke

Böck

Grünwald

2009

Modeling Aspects in Optical Metrology II

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Recently, we proposed a new approach of a noncollinear correlation technique for ultrashort-pulsed coherent optical signals which was referred to as Bessel-autocorrelator (BAC). The BAC-principle combines the advantages of Bessellike nondiffracting beams like stable propagation, angular robustness and self-reconstruction with the principle of temporal autocorrelation. In comparison to other phase-sensitive measuring techniques, autocorrelation is most straightforward and time-effective because of non-iterative data processing. The analysis of nonlinearly converted fringe patterns of pulsed Bessel-like beams reveals their temporal signature from details of fringe envelopes. By splitting the beams with axicon arrays into multiple sub-beams, transversal resolution is approximated. Here we report on adaptive implementations of BACs with improved phase resolution realized by phase-only liquid-crystal-on-silicon spatial light modulators (LCoS-SLMs). Programming microaxicon phase functions in gray value maps enables for a flexible variation of phase and geometry. Experiments on the diagnostics of few-cycle pulses emitted by a mode-locked Ti:sapphire laser oscillator at wavelengths around 800 nm with 2D-BAC and angular tuned BAC were performed. All-optical phase shift BAC and fringe free BAC approaches are discussed.

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Section: Proposal Of a Fringeless Bessel Autocorrelatormentioning

confidence: 99%

Adaptive Bessel-autocorrelation of ultrashort pulses with phase-only spatial light modulators

Luepke

Böck

Grünwald

2009

Modeling Aspects in Optical Metrology II

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“…In case of Bessel beams, this can be circumvented in two ways: (A) by downstream spatial filtering in a self-apodizing truncation setup, i.e., matching a diaphragm to the first zero of the intensity distribution so that the central lobe passes without diffraction (but wasting the energy of the fringes) [17,43], or (B) in aperture-less setup by optimizing the parameters (conical angle, waist radius of the input profile) to only generate this central lobe exactly to the first zero (fulfilling a self-apodizing condition [43,44]). Because of the distinct needle-shape, this particular type of paraxial single-maximum Bessel-like beams was referred to by us as "needle beams" [17,43,44]. To illustrate that, Figures 2b show the intensity distribution functions of a Bessel beam and a needle beam in a transversal plane, respectively.…”

Section: Pulsed Needle Beams and Highly Localized Wavepacketsmentioning

confidence: 99%

Adaptive Generation and Diagnostics of Linear Few-Cycle Light Bullets

Böck¹,

Grünwald²

2013

Applied Sciences

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Abstract:Recently we introduced the class of highly localized wavepackets (HLWs) as a generalization of optical Bessel-like needle beams. Here we report on the progress in this field. In contrast to pulsed Bessel beams and Airy beams, ultrashort-pulsed HLWs propagate with high stability in both spatial and temporal domain, are nearly paraxial (supercollimated), have fringe-less spatial profiles and thus represent the best possible approximation to linear "light bullets". Like Bessel beams and Airy beams, HLWs show self-reconstructing behavior. Adaptive HLWs can be shaped by ultraflat three-dimensional phase profiles (generalized axicons) which are programmed via calibrated grayscale maps of liquid-crystal-on-silicon spatial light modulators (LCoS-SLMs). Light bullets of even higher complexity can either be freely formed from quasi-continuous phase maps or discretely composed from addressable arrays of identical nondiffracting beams. The characterization of few-cycle light bullets requires spatially resolved measuring techniques. In our experiments, wavefront, pulse and phase were detected with a Shack-Hartmann wavefront sensor, 2D-autocorrelation and spectral phase interferometry for direct electric-field reconstruction (SPIDER). The combination of the unique propagation properties of light bullets with the flexibility of adaptive optics opens new prospects for applications of structured light like optical tweezers, microscopy, data transfer and storage, laser fusion, plasmon control or nonlinear spectroscopy. OPEN ACCESSAppl. Sci. 2013, 3 140

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“…To numerically simulate the generation of femtosecond Bessel patterns, a computer program based on a decomposition in an angular spectrum of monochromatic plane waves was developed [27,32,33]. The diffraction integral has to be solved for each spectral contribution.…”

Section: Bessel Autocorrelation With Simulated Fringe Patternsmentioning

confidence: 99%

Noncollinear autocorrelation with radially symmetric nondiffracting beams

Luepke

Kebbel²,

Böck

et al. 2008

SPIE Proceedings

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Fringe-resolved noncollinear autocorrelation extracts information about the pulse duration of ultrashort optical signals from analyzing the intensity envelope of fringes. By detecting nonlinear autocorrelation functions after frequency conversion, even an evaluation of temporal asymmetry and frequency chirp are enabled. Here we report on a modified approach based on replacing crossed plane waves by Bessel-like beams. In comparison to the conventional method, appropriate mathematical transforms have to be applied. The method is simple and single-shot capable and takes advantage of specific advantages of pseudo-nondiffracting beams. First proof-of-principle experiments with fewfemtosecond pulse durations were performed and compared to simulations. In multishot operation regime, the implementation of phase-shifting procedures by spatial light modulators promises considerable improvements of the time resolution analogous to the known principle of phase-shift interferometry.

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Ultrashort-pulsed truncated polychromatic Bessel-Gauss beams

Cited by 34 publications

References 0 publications

Adaptive Bessel-autocorrelation of ultrashort pulses with phase-only spatial light modulators

Adaptive Bessel-autocorrelation of ultrashort pulses with phase-only spatial light modulators

Adaptive Generation and Diagnostics of Linear Few-Cycle Light Bullets

Noncollinear autocorrelation with radially symmetric nondiffracting beams

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