Spatial phase dislocations in femtosecond laser pulses

Bezuhanov, K.; Dreischuh, A.; Paulus, Gerhard G.; Schätzel, Michael G.; Walther, H.; Neshev, Dragomir N.; Królikowski, Wiesław; Kivshar, Yuri S.

doi:10.1364/josab.23.000026

Cited by 31 publications

(16 citation statements)

References 51 publications

(52 reference statements)

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“…High intensity ultrashort optical vortex pulses provide an opportunity to investigate the effects of the angular momentum on atomic or molecular systems and transient non-equilibrium states of matter [1,2]. Current methods of generating femtosecond optical vortices with spiral phase plates and holograms are inherently chromatic and therefore require the introduction of correcting elements in the attempt to compensate topological charge dispersion caused by the broad spectral bandwidth associated with ultrashort light pulses [3,4].…”

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Efficient beam converter for the generation of high-power femtosecond vortices

et al. 2010

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Abstract:We describe an optical beam converter for an efficient transformation of Gaussian femtosecond laser beams to single-or double-charge vortex beams showing no spatial or topological charge dispersion. The device achieves a conversion efficiency of 75% for single-and 50% for double-charge vortex beams and can operate with high energy broad bandwidth pulses. We also show that the topological charge of a femtosecond vortex beam can be determined by analyzing its intensity distribution in the focal area of a cylindrical lens.

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Efficient beam converter for the generation of high-power femtosecond vortices

et al. 2010

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“…1(a). Several modifications of these setups have been recently reported [6][7][8]. The first grating operates as a dispersive element, while the second grating is used to encode a specific spatial distribution.…”

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Generation of femtosecond paraxial beams with arbitrary spatial distribution

et al. 2010

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We present an approach to generate paraxial laser beams with arbitrary spatial distribution in the femtosecond time regime. The proposed technique is based upon a pair of volume phase holographic gratings working in parallel arrangement. It exploits the spatial coherence properties of the incoming laser beam in a compact and robust setup that mitigates angular and spatial chirp. The gratings were recorded in a photopolymerizable glass with a high optical damage threshold and a large optical throughput. Setup performance is studied and experimentally demonstrated by generating Laguerre-Gaussian femtosecond pulses.

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“…Known schemes for holographic creation of beam modes that compensate for angular chirp are the "dispersionless 4f" [12] and our "2f -2f" [13] setups. A proof-ofprinciple experiment using a pulse compression scheme was carried out as an example of incorporating the existing compressor of a chirped-pulseamplification (CPA) laser into the production of ultrashort LG beams [14]. Although this concept would allow for increased beam power, directly modifying the grating(s) in a CPA laser stretcher (or compressor) would be costly and inflexible.…”

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confidence: 99%