Notable advances in photonics: the JOPT Highlights of 2016

McKenna, J.

doi:10.1088/2040-8986/aa62bc

Cited by 5 publications

(4 citation statements)

References 48 publications

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“…f-θ lenses are commonly used in many applications involving the displacement of a laser beam for scanning, engraving [ 28 ], optical coherence tomography (OCT) [ 29 ], and material processing applications. Unlike the common spherical lens, which has a curved focal plane, an f-θ lens provides a flat focal plane with low field curvature, a large field of view, and homogenous beam characteristics in the image plane throughout the entire scan field.…”

Section: Methodsmentioning

confidence: 99%

“…f-θ lenses are commonly used in many applications involving the displacement of a laser beam for scanning, engraving [28], optical coherence tomography (OCT) [29], and The scanning mirror moves 𝜃 4.5°, deflecting the beam onto the f-θ lens with 2𝜃 9°. The displacement of the probing beam from the optical axis is proportional to the incident angle 𝜃:…”

Section: Design Of the F-θ Opticsmentioning

confidence: 99%

See 1 more Smart Citation

Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics

May,

Mohammadzadeh,

Keil

et al. 2024

Sensors

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Terahertz tomography is a promising method among non-destructive inspection techniques to detect faults and defects in dielectric samples. Recently, image quality was improved significantly through the incorporation of a priori information and off-axis data. However, this improvement has come at the cost of increased measurement time. To aim toward industrial applications, it is therefore necessary to speed up the measurement by parallelizing the data acquisition employing multi-channel setups. In this work, we present two tomographic frequency-modulated continuous wave (FMCW) systems working at a bandwidth of 230–320 GHz, equipped with an eight-channel detector array, and we compare their imaging results with those of a single-pixel setup. While in the first system the additional channels are used exclusively to detect radiation refracted by the sample, the second system features an f-θ lens, focusing the beam at different positions on its flat focal plane, and thus utilizing the whole detector array directly. The usage of the f-θ lens in combination with a scanning mirror eliminates the necessity of the formerly used slow translation of a single-pixel transmitter. This opens up the potential for a significant increase in acquisition speed, in our case by a factor of four to five, respectively.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Design Of the F-θ Opticsmentioning

confidence: 99%

Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics

May,

Mohammadzadeh,

Keil

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…f-θ lenses are commonly used in many applications involving the displacement of a laser beam for scanning, engraving [20], optical coherence tomography (OCT) [21], or material processing applications. Unlike the common spherical lens, which has a curved focal plane, an f-θ lens provides a flat focal plane with low field curvature, a large field of view, and homogenous beam characteristics in the image plane throughout the entire scan field.…”

Section: Design Of the F-θ Opticsmentioning

confidence: 99%

Coherent Off-Axis Terahertz Tomography Addressing a Multi-Channel Array with F-theta Optics

May,

Mohammadzadeh,

Keil

et al. 2023

Preprint

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Terahertz tomography is a promising method among non-destructive inspection techniques to detect faults and defects in dielectric samples. Image quality recently significantly improved through the incorporation of a priori information and off-axis data. However, this improvement has come at the cost of increased measurement time. To aim toward industrial applications, it is therefore necessary to speed up the measurement by parallelizing the data acquisition employing multi-channel setups. In this work, we present two tomographic frequency-modulated continuous wave (FMCW) systems working at a bandwidth of 230-320 GHz, equipped with an eight-channel detector array, and compare their imaging results with a single-pixel setup. While in the first system, the additional channels are used exclusively to detect radiation refracted by the sample, the second system features an f-θ lens, focusing the beam at different positions on its flat focal plane, and thus utilizing the whole detector array directly. The usage of the f-θ lens in combination with a scanning mirror eliminates the necessity of the formerly used slow translation of a single-pixel transmitter. As a result acquisition time decreases by a factor of four to five, respectively, in comparison to the single-pixel setup.

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“…Key and well‐established glass‐related markets include consumer glass and electronics, containers, insulation, composites, windows, automotive glass, lighting, communications, optics, and so on. In recent decades, there has been also a marked increase in the use of glass in fiber optics and photonics, various glass‐containing composites and the vitrification (immobilization) of liquid high‐level radioactive wastes . In particular, photonics is an extremely fast‐growing sector; it has a global market of around € 350 billion, which is projected to reach over € 600 billion by 2020, with major growth expected in lighting, medical technologies and life sciences, laser‐based manufacturing, and optical communications …”

Section: The Unique Properties and Importance Of Glass And Opticsmentioning

confidence: 99%

White paper on the future of plasma science for optics and glass

Šimek

Černák

Kylián

et al. 2018

Plasma Processes & Polymers

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This paper reflects on the future of low-temperature plasma science in relation to the manufacturing and novel uses of glass. The text summarizes the current state of the art on the major topics discussed, such as glass processing, optics and photonics, healthcare issues, building and fenestration applications. It also identifies several challenges that are driven by applications, and which are compatible with roadmaps for their respective industries. The frontiers of plasma science are discussed, for example, in relation to the use of plasmas as an active optical element in fast-response adaptive optics systems, optical metamaterials, and the development of next-generation nanolithography. Future demand for the successful implementation of plasma-based technologies in the glass, optics, and photonic industries will depend on further progress in plasma science. Hence, some needs and recommendations concerning both fundamental and applied plasma research are summarized.

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Notable advances in photonics: the JOPT Highlights of 2016

Cited by 5 publications

References 48 publications

Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics

Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics

Coherent Off-Axis Terahertz Tomography Addressing a Multi-Channel Array with F-theta Optics

White paper on the future of plasma science for optics and glass

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