Dynamic laser beam shaping for material processing using hybrid holograms

Liu, Dun; Wang, Yutao; Zhai, Zhongsheng; Fang, Zheng; Qing, Tao; Perrie, Walter; Edwarson, Stuart P.; Dearden, Geoff

doi:10.1016/j.optlastec.2017.12.022

Cited by 40 publications

(20 citation statements)

References 18 publications

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“…Starting from a conventional field-mapping concept for shaping a rectangular flattop distribution 96 (for alternatives, see Refs. [97][98][99][100][101], the SLM displays the required phase modulation at a well-defined subsection-in the present case the SLM's right-hand side, see Fig. 14.…”

Section: Laser Surface Structuring and Percussion Drillingmentioning

confidence: 60%

Structured light for ultrafast laser micro- and nanoprocessing

et al. 2021

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The industrial maturity of ultrashort pulsed lasers has triggered the development of a plethora of material processing strategies. Recently, the combination of these remarkable temporal pulse properties with advanced structured light concepts has led to breakthroughs in the development of laser application methods, which will now gradually reach industrial environments. We review the efficient generation of customized focus distributions from the near-infrared down to the deep ultraviolet, e.g., based on nondiffracting beams and threedimensional-beam splitters, and demonstrate their impact for micro-and nanomachining of a wide range of materials. In the beam shaping concepts presented, special attention was paid to suitability for both high energies and high powers.

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Section: Laser Surface Structuring and Percussion Drillingmentioning

confidence: 60%

Structured light for ultrafast laser micro- and nanoprocessing

et al. 2021

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“…The manipulation of the properties of optical beams such as spatial profile, [139][140][141] irradiance, phase, velocity, [142] and propagation range [143,144] has been a center of a lot of scientific interest for long time. Beam shaping find applications in light-sheet fluorescence microscopy, [145][146][147] lithography, [148,149] material processing, [150,151] optical communications, [152][153][154] optical computing, [155] and many others. The quest for shaping optical beams with compact, integrated devices has led to many innovative ways for manipulating light beams, including, for example, plasmonics [156,157] and metasurfaces.…”

Section: Bics For Beam Shapingmentioning

confidence: 99%

Photonic Bound States in the Continuum: From Basics to Applications

Azzam

Kildishev

2020

Advanced Optical Materials

332

141

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In theory, BICs are dark states with infinite radiative lifetime and generally require at least one dimension of the structure extending to infinity. [6] Similar conditions can also be obtained in localized systems of finite extent when the permittivity approaches zero. [5,11] However, in practice, due to the finite extent of structures, material absorption, and other external perturbations, BICs collapse to a Fano resonance with a limited radiative Q factor. Such resonances are known as quasi-BIC and they have been used to obtain very high Q resonances in numerous photonic systems to date. [6,8,12] Even though practical implementations of BICs are limited to quasi-BIC, in the literature, as well as in this review, quasi-BIC are commonly referred to as BICs. Another type of high-Q resonances called near-BIC is obtained in the vicinity of the BIC through detuning the system from the BIC regime. [9,13,14] Near-BICs can be explained by the Theory of Resonance Reactions by Fonda [13,14] as a bound state can exist in the continuum at an energy where some channels are open even when the open and closed channels are strongly coupled. If the Hamiltonian of the system differs slightly from the one that can produce such a bound state, a sharp resonance appears in all scattering and reaction cross-sections. Near-BIC resonances can be obtained over an interval of values of a specific parameter of the system, unlike BICs that are generally achieved at a single value of the parameter. [9,15] This is of importance for practical systems as it provides stability to fabrication errors and other imperfections. [12] It is also worth mentioning that the total Q factor (Q t) realizable through BICs is generally limited by the material loss. While the radiative Q-factor (Q r) at BICs can diverge, the non-radiative Q-factor (Q nr) is limited by material absorption and its inhomogeneous broadening, scattering from the structural disorder, and in-plane lateral leakage. It is therefore, important to have an accurate distinction between Q r and Q nr and account for non-radiative processes as generally the main contributors to the total Q." 1.2. BIC Types and Formation Mechanisms Since the time of initial prediction of BICs in photonics, they have been realized in numerous geometrical systems, including gratings, waveguides, metasurfaces, and photonic crystals. [4,7,9,16-24] Such a broad diversity of photonic systems supports different types of BICs that originate from various physical mechanisms. We will briefly highlight the different The introduction of bound states in the continuum (BICs) to photonics has revolutionized the way cavity design and light-matter interactions are thought about in general. BICs can have very high quality factors, even in open structures where access to radiation is permissible. Now, BICs found applications in a large class of areas, including nonlinear enhancement, coherent light generation, sensors, filters, integrated circuits, and many others. In this review, the different types of BICs in photonic systems,...

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“…In addition to the well-known diffractively generated beams, simple shapes characterized by an extended area wherein the intensity is ideally uniform easily lend themselves to a wide variety of practical applications. For example, simple disks or square patterns have straightforward applications in biophotonics, like for selective tissue stimulation [14,15] or counter-propagating optical traps [16][17][18] or in materials processing to get more uniform ablation profiles [19][20][21]. The following sections thus outline how we derive a phase function that allows an input Gaussian beam to be transformed into simple geometric shapes such as disks and rectangles.…”

Section: Mapping Beams Into Simple and Practical Geometrical Formsmentioning

confidence: 99%

Point spread function shaping using geometric analysis

Bañas

Separa²,

Engay

et al. 2018

Optics Communications

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We present a method for shaping point spread functions (PSF) into simple geometric shapes that are free of noise or speckles. The derived phase distributions are intended for typical 2f setups used for reading out computer generated holograms (CGH). Used in conjunction with existing CGH techniques for spot distributions the shaped PSFs can similarly be distributed on a 3D working volume. The PSF's contiguous intensity and phase make them beneficial in many applications such as photo-stimulation, optical manipulation, multi-photon excitation and laser materials processing. This manuscript presents the derivations of the phase functions and their experimental demonstration.

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Dynamic laser beam shaping for material processing using hybrid holograms

Cited by 40 publications

References 18 publications

Structured light for ultrafast laser micro- and nanoprocessing

Structured light for ultrafast laser micro- and nanoprocessing

Photonic Bound States in the Continuum: From Basics to Applications

Point spread function shaping using geometric analysis

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