Fabrication of grating structures by simultaneous multi-spot fs laser writing

Winfield, Richard Dien; Bhuian, B.; O’Brien, S.; Crean, G.M.

doi:10.1016/j.apsusc.2007.02.100

Cited by 21 publications

(10 citation statements)

References 14 publications

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“…Fortunately, there are several advanced techniques that may be employed to reduce the inscription time. These include using shaped wavefronts such as Bessel beams to modify large surface areas in fewer laser passes [52,53], multispot arrays to write multiple components simultaneously [21,54], and high-speed laser writing with galvo scanning mirrors [55]. Improving the manufacturability remains an active area of interest that we aim to investigate in future research.…”

Section: Demonstration Of Raman Spectra Acquisition Of Tissuementioning

confidence: 99%

A Miniature Fibre-Optic Raman Probe Fabricated by Ultrafast Laser-Assisted Etching

et al. 2020

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Optical biopsy describes a range of medical procedures in which light is used to investigate disease in the body, often in hard-to-reach regions via optical fibres. Optical biopsies can reveal a multitude of diagnostic information to aid therapeutic diagnosis and treatment with higher specificity and shorter delay than traditional surgical techniques. One specific type of optical biopsy relies on Raman spectroscopy to differentiate tissue types at the molecular level and has been used successfully to stage cancer. However, complex micro-optical systems are usually needed at the distal end to optimise the signal-to-noise properties of the Raman signal collected. Manufacturing these devices, particularly in a way suitable for large scale adoption, remains a critical challenge. In this paper, we describe a novel fibre-fed micro-optic system designed for efficient signal delivery and collection during a Raman spectroscopy-based optical biopsy. Crucially, we fabricate the device using a direct-laser-writing technique known as ultrafast laser-assisted etching which is scalable and allows components to be aligned passively. The Raman probe has a sub-millimetre diameter and offers confocal signal collection with 71.3% ± 1.5% collection efficiency over a 0.8 numerical aperture. Proof of concept spectral measurements were performed on mouse intestinal tissue and compared with results obtained using a commercial Raman microscope.

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Section: Demonstration Of Raman Spectra Acquisition Of Tissuementioning

confidence: 99%

A Miniature Fibre-Optic Raman Probe Fabricated by Ultrafast Laser-Assisted Etching

et al. 2020

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show abstract

“…Fortunately, there are several advanced techniques that may be employed to reduce the inscription time. These include using shaped wavefronts such as Bessel beams to modify large surface areas in fewer laser passes [50,51], multispot arrays to write multiple components simultaneously [18,52] and high-speed laser writing with galvo scanning mirrors [53]. Improving the manufacturability remains an active area of interest which we aim to investigate in future research.…”

Section: Demonstration Of Raman Spectra Acquisition Of Tissuementioning

confidence: 99%

A Miniature Fibre-optic Raman Probe Fabricated by Ultrafast Laser Assisted Etching

Ross¹,

MacLachlan²,

Smith³

et al. 2020

Preprint

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Optical biopsy describes a range of medical procedures in which light is used to investigate disease in the body, often in hard-to-reach regions via optical fibres. Optical biopsies can reveal a multitude of diagnostic information to aid therapeutic diagnosis and treatment with higher specificity and shorter delay than traditional surgical techniques. One specific type of optical biopsy relies on Raman spectroscopy to differentiate tissue types at the molecular level and has been used successfully to stage cancer. However, complex micro-optical systems are usually needed at the distal-end to optimise the signal-to-noise properties of the Raman signal collected. Manufacturing these devices remains a critical challenge, particularly in a way suitable for large scale adoption. In this paper, we describe a novel fibre-fed micro-optic system designed for efficient signal delivery and collection during a Raman spectroscopy based optical biopsy. Crucially, we fabricate the device using a direct-laser-writing technique known as ultrafast laser assisted etching which is scalable and allows components to be aligned passively. The Raman probe has a sub-millimetre diameter and offers confocal signal collection with 71.3 ± 1.5% collection efficiency over a 0.8 numerical aperture. Proof of concept spectral measurements were performed on mouse intestinal tissue and compared with results obtained using a commercial Raman microscope.

show abstract

“…Direct three-dimensional (3D) printing of micro-optical and nano-optical components by femtosecond direct laser writing has recently revolutionized the field of micro-optics. While the first publications covered single optical components, such as microlenses ( 1 ), diffraction gratings ( 2 ), waveguides ( 3 ), free-form surfaces ( 4 , 5 ), phase masks ( 6 ), or photonic crystals ( 7 ), the field has considerably developed in terms of complexity. Hybrid refractive-diffractive components ( 8 ), hybrid free-form lenses that are directly printed onto optical fibers ( 9 ), or even multicomponent optical systems ( 10 , 11 ) exhibit a huge potential for many fields of application.…”

Section: Introductionmentioning

confidence: 99%