Generation of femtosecond paraxial beams with arbitrary spatial distribution

Martínez-Matos, Óscar; Rodrigo, José A.; Hernández‐Garay, M. P.; Izquierdo, J. G.; Weigand, Rudolf; Calvo, M. L.; Cheben, Pavel; Vaveliuk, Pablo; Bañares, Luis

doi:10.1364/ol.35.000652

Cited by 21 publications

(21 citation statements)

References 14 publications

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“…In the following section we will use Eqs. (8) and (9) to fit and interpret the experimental results.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Fitting for both spectra (red lines) has been performed using Eq. (8). Grating parameters are displayed on Table 1.…”

Section: Gratings For Pulse Spectral Conservationmentioning

confidence: 99%

“…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%

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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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“…In the following section we will use Eqs. (8) and (9) to fit and interpret the experimental results.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Fitting for both spectra (red lines) has been performed using Eq. (8). Grating parameters are displayed on Table 1.…”

Section: Gratings For Pulse Spectral Conservationmentioning

confidence: 99%

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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 analysis is based on the photopolymerizable glass [5][6][7][8][9] because the transmission gratings on this type of material have been implemented to spatial 10 and spectral 11 pulse shaping in a femtosecond laser system. We start with the grating characterization.…”

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confidence: 99%

Femtosecond laser induced damage characterization of transmission volume phase gratings

Martínez-Matos

Hernández‐Garay

Izquierdo

et al. 2014

Applied Physics Letters

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Thermal poling induced second-order nonlinearity in femtosecond-laser-modified fused silica Appl. Phys. Lett. 93, 061115 (2008) A procedure to characterize the induced damage and the incubation effects in volume transmission gratings under femtosecond laser pulse train illumination is presented. It was also developed a formalism that explains the damage processes. Our proposal was employed on glass gratings to show the effectiveness of the method and its potential to design transmission gratings with enhanced laser induced damage threshold. This procedure is able to be extended to any transmission grating composed by chemically non-uniform material, opening up new perspectives to femtosecond laser pulse shaping. V C 2014 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4892010] Diffraction gratings are essential parts of femtosecond laser systems. They are used as dispersive elements in compressors and stretchers as well as for temporal, spatial, and spectral pulse shaping, to name a few. A laser induceddamage threshold (LIDT) characterization of gratings, i.e., the highest fluence value for which no damage is produced, is a main task to determine its applicability range. In the last years, LIDT in reflection multilayer dielectric gratings [1][2][3] and in mixed metal dielectric gratings 4 has been investigated by varying the material composition of the multilayer and by proving different grating profiles. The damage dynamics were established for a wide class of gratings, but only in the reflection geometry. No research on LIDT has been reported in the transmission geometry at the present time. In this Letter, we propose a procedure to characterize the induced damage and the incubation effects, i.e., permanent material changes produced by multiple pulse accumulation mechanisms, in volume transmission gratings when implemented in a femtosecond laser system. Besides, we develop a formalism to explain the damage processes. Our approach is tested on a photopolymerizable glass grating, showing the validity of the method to design transmission gratings with enhanced LIDT.The analysis is based on the photopolymerizable glass 5-9 because the transmission gratings on this type of material have been implemented to spatial 10 and spectral 11 pulse shaping in a femtosecond laser system. We start with the grating characterization. The grating is formed by a permanent spatial modulation of the refractive index, nðxÞ ¼ n b þ n 1 ðxÞ; within the bulk of the glass. Parameter n b is the background refractive index of the insulating binder (the glass) and

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“…The optical system composed by the two holograms emulates the spectral response of the etalon and constitutes the HFPS proposed in this work. Dispersion analysis of parallel gratings can be found in [5].…”

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confidence: 99%

Holographic Fabry–Perot spectrometer

Martínez-Matos

Rodrigo²,

Vaveliuk

et al. 2011

Opt. Lett.

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We propose a spectrum analyzer based on the properties of a hologram recorded with the field transmitted by a Fabry-Perot etalon. The spectral response of this holographic Fabry-Perot spectrometer (HFPS) is analytically investigated in the paraxial approximation and compared with a conventional Fabry-Perot etalon of similar characteristics. We demonstrate that the resolving power is twice increased and the free spectral range (FSR) is reduced to one-half. The proposed spectrometer could improve the operational performance of the etalon because it can exhibit high efficiency and it would be insensible to environmental conditions such as temperature and vibrations. Our analysis also extends to another variant of the HFPS based on holographic multiplexing of the transmitted field of a Fabry-Perot etalon. This device increases the FSR, keeping the same HFPS performance.

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Generation of femtosecond paraxial beams with arbitrary spatial distribution

Cited by 21 publications

References 14 publications

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Femtosecond spectral pulse shaping with holographic gratings recorded in photopolymerizable glasses

Femtosecond laser induced damage characterization of transmission volume phase gratings

Holographic Fabry–Perot spectrometer

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