Beam shape and intensity profile of a fiber-bundle prism-coupled waveguide

Golnabi, H.; Haghighatzadeh, Azadeh

doi:10.1016/j.optlaseng.2010.01.004

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…1. In general, the experimental arrangement with the exception of the power measurement system is similar to the one explained in our recent report [18]. It consists of a light source illuminating the fiber-bundle, a prism beam shaping duct, digital and CCD cameras, the interface card for the CCD camera, and a PC.…”

Section: Beam Shaping Designmentioning

confidence: 99%

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Flat-top beam profile generated using a fiber-bundle prism-coupled beam shaper

Haghighatzadeh¹,

Golnabi²

2011

Optics Communications

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Section: Beam Shaping Designmentioning

confidence: 99%

“…Considering the importance of the beam shaping in different areas, in previous works we presented a new system based on a plastic fiber- [17,18]. In the following efforts improvements are made in our experimental design and the aims of this research study are twofold.…”

Section: Introductionmentioning

confidence: 99%

Flat-top beam profile generated using a fiber-bundle prism-coupled beam shaper

Haghighatzadeh¹,

Golnabi²

2011

Optics Communications

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“…Golnabi and Haghighatzadeh have obtained re ection and image transmittance data of an optical beam shaping system based on a plastic ber-bundle prism-coupled waveguide by using a light emitting diode (LED) source for the illumination and performing image analysis with a charge coupled device (CCD) digital camera [24]. Moreover, complementary metal oxide semiconductor (CMOS) cameras have also been employed to perform laser beam pro le measurements [25].…”

Section: Introductionmentioning

confidence: 99%

A multi-method approach for beam characterization of microfading testers used in cultural heritage conservation science

Świt¹,

Gargano²,

Hoyo‐Meléndez³

2021

Preprint

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Microfading testers have become widely accepted by the conservation science community for establishing and recommending appropriate lighting conditions that minimize damage to collections. These devices offer the opportunity of measuring the photostability of cultural heritage objects due to their optical setup, which allows to conduct and quantify accelerated photoaging over a spot of approximately 0.5 mm. Also, by using a high sensitivity photodetector it is possible to measure spectrocolorimetric change before it is perceived by the human eye. Although a considerable amount of testing is currently performed with these instruments, there are still safety concerns in terms of possible damage to the objects due to the use of a high intensity spot during testing. Nevertheless microfadeometry is widely considered a nondestructive technique. The advantages and disadvantages of several methods used to determine the beam shape and intensity profiles are described with the aim of providing various options to microfading researchers interested in characterizing their irradiation spots. Conventional and imaging methods were employed and are compared in terms of their accuracy, cost, reliability, and technical features. It has been found that both methods provide beam width measurements in satisfactory agreement within experimental error.

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“…Other methods involve the use of digital cameras to acquire photographic images of the output beams. Golnabi and Haghighatzadeh have obtained reflection and image transmittance data of an optical beam shaping system based on a plastic fiber-bundle prism-coupled waveguide by using a light emitting diode (LED) source for the illumination and performing image analysis with a charge coupled device (CCD) digital camera [27]. Moreover, complementary metal oxide semiconductor (CMOS) cameras have also been employed to perform laser beam profile measurements [28].…”

Section: Introductionmentioning

confidence: 99%

Beam characterization of a microfading tester: evaluation of several methods

2021

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Microfading testing allows to evaluate the sensitivity to light of a specific artwork. Characterization of the illumination spot is important to determine its shape, dimensions, light distribution, and intensity in order to limit and account for possible damage. In this research the advantages and disadvantages of several methods used to determine the beam shape and intensity profiles are described with the aim of providing various options to microfading researchers interested in characterizing their irradiation spots. Conventional and imaging methods were employed and are compared in terms of their accuracy, cost, reliability, and technical features. Conventional methods consisted of an aperture technique using aluminium foil and four different materials namely stainless steel, silicon, muscovite, and Teflon used as sharp edges. The imaging methods consisted of digital photography of illumination spot, direct beam measurement using a CMOS camera, and direct beam measurement using a laser beam profiler. The results show that both conventional and imaging methods provide beam width measurements, which are in satisfactory agreement within experimental error. The two best methods were direct measurement of the beam using a CMOS camera and sharp-edge procedure. MFT illumination beam with a CMOS camera followed by a determination of the beam diameter using a direct method, more specifically one involving a sharp-edge technique.

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Beam shape and intensity profile of a fiber-bundle prism-coupled waveguide

Cited by 8 publications

References 22 publications

Flat-top beam profile generated using a fiber-bundle prism-coupled beam shaper

Flat-top beam profile generated using a fiber-bundle prism-coupled beam shaper

A multi-method approach for beam characterization of microfading testers used in cultural heritage conservation science

Beam characterization of a microfading tester: evaluation of several methods

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