Vortices in femtosecond laser fields

Bezuhanov, K.; Dreischuh, A.; Paulus, G. G.; Schaetzel, M. G.; Walther, H.

doi:10.1117/12.563108

Cited by 20 publications

(29 citation statements)

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“…The first group is established by the optical elements for temporal [6] and spatial pulse shaping [7,8]. They must preserve the complete spectrum and operate as dispersive elements in order to adjust the spectral phase for pulse envelope control.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Hernández‐Garay¹,

Martínez-Matos²,

Izquierdo³

et al. 2011

Opt. Express

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Abstract:The majority of the applications of ultrashort laser pulses require a control of its spectral bandwidth. In this paper we show the capability of volume phase holographic gratings recorded in photopolymerizable glasses for spectral pulse reshaping of ultrashort laser pulses originated in an Amplified Ti: Sapphire laser system and its second harmonic. Gratings with high laser induce damage threshold (LIDT) allowing wide spectral bandwidth operability satisfy these demands. We have performed LIDT testing in the photopolymerizable glass showing that the sample remains unaltered after more than 10 million pulses with 0,75 TW/cm 2 at 1 KHz repetition rate. Furthermore, it has been developed a theoretical model, as an extension of the Kogelnik's theory, providing key gratings design for bandwidth operability. The main features of the diffracted beams are in agreement with the model, showing that non-linear effects are negligible in this material up to the fluence threshold for laser induced damage. The high versatility of the grating design along with the excellent LIDT indicates that this material is a promising candidate for ultrashort laser pulses manipulations.

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Section: Introductionmentioning

confidence: 99%

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Hernández‐Garay¹,

Martínez-Matos²,

Izquierdo³

et al. 2011

Opt. Express

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“…The angular dispersion on G is then reverted and the system images the input field at the grating in the SLM, avoiding spatial chirp due to light propagation between the planes. The imaging optical systems proposed in the literature are a 4f setup [13], a 2f-2f setup [14] and a double pass grating compressor, which is not exactly an imaging system [15]. Other configurations such as a lens-less setup with grating and SLM assembled [16,17] and modifications based on the scheme in Fig.…”

Section: Optical Setupmentioning

confidence: 99%

Femtosecond spatial pulse shaping at the focal plane

Martínez-Matos¹,

Vaveliuk²,

Izquierdo³

et al. 2013

Opt. Express

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Abstract:Spatial shaping of ultrashort laser beams at the focal plane is theoretically analyzed. The description of the pulse is performed by its expansion in terms of Laguerre-Gaussian orthonormal modes. This procedure gives both a comprehensive interpretation of the propagation dynamics and the required signal to encode onto a spatial light modulator for spatial shaping, without using iterative algorithms. As an example, pulses with top-hat and annular spatial profiles are designed and their dynamics analyzed. The interference of top-hat pulses is also investigated finding potential applications in high precision pump-probe experiments (without using delay lines) and for the creation of subwavelength ablation patterns. In addition, a novel class of ultrashort pulses possessing non-stationary orbital angular momentum is also proposed. These exotic pulses provide additional degrees of freedom that open up new perspectives in fields such as laser-matter interaction and micro-machining.

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“…10a-10c show nonzero intensity at their centers. This is due to angular dispersion resulting from the diffraction of broadband ͑ϳ20 nm͒ radiation [18]. To compensate this angular dispersion we used a folded version of our 2f-2f setup [15,16].…”

Section: Performance Of the Laser-etched Gratingsmentioning

confidence: 99%

“…Upon illuminating either of these elements with monochromatic light having a Gaussian intensity profile we obtain OVs that are generally a superposition of pure LG states [5,6]. The contributing LG modes have the same azimuthal mode number m but different radial mode numbers p. The two elements differ in that SPPs are near 100% power efficient [18], while gratings are typically less efficient [13,16,19].…”

Section: Introductionmentioning

confidence: 99%

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Ultrashort intense-field optical vortices produced with laser-etched mirrors

2007

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We introduce a simple and practical method to create ultrashort intense optical vortices for applications involving high-intensity lasers. Our method utilizes femtosecond laser pulses to laser etch grating lines into laser-quality gold mirrors. These grating lines holographically encode an optical vortex. We derive mathematical equations for each individual grating line to be etched, for any desired (integer) topological charge. We investigate the smoothness of the etched grooves. We show that they are smooth enough to produce optical vortices with an intensity that is only a few percent lower than in the ideal case. We demonstrate that the etched gratings can be used in a folded version of our 2f-2f setup [Opt. Express 19, 7599 (2005)] to compensate angular dispersion. Finally, we show that the etched gratings withstand intensities of up to 10 12 W͞cm 2 .

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Vortices in femtosecond laser fields

Cited by 20 publications

References 0 publications

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Femtosecond spatial pulse shaping at the focal plane

Ultrashort intense-field optical vortices produced with laser-etched mirrors

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