Slit beam shaping method for femtosecond laser direct-write fabrication of symmetric waveguides in bulk glasses

Ams, Martin; Marshall, Graham D.; Spence, David J.; Withford, Michael J.

doi:10.1364/opex.13.005676

Cited by 288 publications

(176 citation statements)

References 10 publications

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“…The astigmatic beam shaping can be easily obtained by a cylindrical telescope before the focusing objective. The same effect of focal volume shaping in order to decrease the confocal parameter can also be obtained by the use of a slit, oriented parallel to the laser scanning direction, before the focusing lens [60]. This arrangement also creates waveguides with symmetric cross section, but has the disadvantage of wasting most of the laser power impinging on the slit.…”

Section: Laser and Photonics Reviewsmentioning

confidence: 96%

Femtosecond laser microstructuring: an enabling tool for optofluidic lab‐on‐chips

Osellame

Hoekstra

Cerullo

et al. 2011

Laser & Photonics Reviews

281

226

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This paper provides an overview of the rather new field concerning the applications of femtosecond laser microstructuring of glass to optofluidics. Femtosecond lasers have recently emerged as a powerful microfabrication tool due to their unique characteristics. On the one hand, they enable to induce a permanent refractive index increase, in a micrometer-sized volume of the material, allowing single-step, three-dimensional fabrication of optical waveguides. On the other hand, femtosecond-laser irradiation of fused silica followed by chemical etching enables the manufacturing of directly buried microfluidic channels. This opens the intriguing possibility of using a single laser system for the fabrication and three-dimensional integration of optofluidic devices. This paper will review the state of the art of femtosecond laser fabrication of optical waveguides and microfluidic channels, as well as their integration for high sensitivity detection of biomolecules and for cell manipulation.

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Section: Laser and Photonics Reviewsmentioning

confidence: 96%

Femtosecond laser microstructuring: an enabling tool for optofluidic lab‐on‐chips

Osellame

Hoekstra

Cerullo

et al. 2011

Laser & Photonics Reviews

281

226

View full text Add to dashboard Cite

show abstract

“…This is due image of a fourth-order WBG structure in the same sample using an adaptive-optical (AO) microscope [32]. The typical triangular crosssection of an index structure created using the slit method [33] is evident.…”

Section: Bragg Conditionmentioning

confidence: 95%

“…We employ the slit method to finely control WBG cross-sections [33]. The resulting index profiles are typically triangular in shape ( Figure 5) and guide circularly symmetric modes [32,54,55].…”

Section: Wbg Cross-sectionmentioning

confidence: 99%

Fabricating waveguide Bragg gratings (WBGs) in bulk materials using ultrashort laser pulses

et al. 2017

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Optical waveguide Bragg gratings (WBGs) can be created in transparent materials using femtosecond laser pulses. The technique is conducted without the need for lithography, ion-beam fabrication methods, or clean room facilities. This paper reviews the field of ultrafast laser-inscribed WBGs since its inception, with a particular focus on fabrication techniques, WBG characteristics, WBG types, and WBG applications.

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“…Although it appears to be the optimized condition for producing symmetric structures, the longitudinal micromachining is usually avoided, once the waveguide length is limited by the working distance of the objective lens (ordinary close to 1 mm). In order to address this issue, the transversal writing has been used along with a cylindrical lens or slit that induces astigmatism in a proper direction to correct the asymmetry [102][103][104].…”

Section: Optical Waveguides In Glassesmentioning

confidence: 99%

Ultrafast Laser Pulses for Structuring Materials at Micro/Nano Scale: From Waveguides to Superhydrophobic Surfaces

Corrêa

Almeida

et al. 2017

Photonics

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Abstract:The current demand for fabricating optical and photonic devices displaying high performance, using low-cost and time-saving methods, prompts femtosecond (fs)-laser processing as a promising methodology. High and low repetition femtosecond lasers enable surface and/or bulk modification of distinct materials, which can be used for applications ranging from optical waveguides to superhydrophobic surfaces. Herein, some fundamental aspects of fs-laser processing of materials, as well as the basics of their most common experimental apparatuses, are introduced. A survey of results on polymer fs-laser processing, resulting in 3D waveguides, electroluminescent structures and active hybrid-microstructures for luminescence or biological microenvironments is presented. Similarly, results of fs-laser processing on glasses, gold and silicon to produce waveguides containing metallic nanoparticles, analytical chemical sensors and surface with modified features, respectively, are also described. The complexity of fs-laser micromachining involves precise control of material properties, pushing ultrafast laser processing as an advanced technique for micro/nano devices.

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Slit beam shaping method for femtosecond laser direct-write fabrication of symmetric waveguides in bulk glasses

Cited by 288 publications

References 10 publications

Femtosecond laser microstructuring: an enabling tool for optofluidic lab‐on‐chips

Femtosecond laser microstructuring: an enabling tool for optofluidic lab‐on‐chips

Fabricating waveguide Bragg gratings (WBGs) in bulk materials using ultrashort laser pulses

Ultrafast Laser Pulses for Structuring Materials at Micro/Nano Scale: From Waveguides to Superhydrophobic Surfaces

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