Mach-Zehnder-based measurement of light emitting diodes temporal coherence

Torcal-Milla, Francisco José; Lobera, Julia; López, Ana M.; Palero, Virginia; Andrés, Nieves; Arroyo, M. P.

doi:10.1016/j.ijleo.2022.169722

Cited by 5 publications

(2 citation statements)

References 23 publications

(35 reference statements)

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“…The incoherent superposition does not generate distinct rings around the central maxima as expected of a Bessel distribution due to the lack of phase relations for light emitted from every point. The temporal coherence length for a Gaussian fit of LED emission spectra is given by L tc = 4 ln 2 π λ 2 0 ∆λ , where λ 0 is the central emission wavelength and ∆λ is its width or full width at half maximum (FWHM), and it coincides well with experimentally measured values L tc ≈ 2 µm using Mach-Zehnder interferometry [73].…”

Section: Theory: Fraxicon Illuminated By An Incoherent and Extended S...supporting

confidence: 81%

Fraxicon for Optical Applications with Aperture ∼1 mm: Characterisation Study

Mu,

Smith,

et al. 2024

Nanomaterials

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Emerging applications of optical technologies are driving the development of miniaturised light sources, which in turn require the fabrication of matching micro-optical elements with sub-1 mm cross-sections and high optical quality. This is particularly challenging for spatially constrained biomedical applications where reduced dimensionality is required, such as endoscopy, optogenetics, or optical implants. Planarisation of a lens by the Fresnel lens approach was adapted for a conical lens (axicon) and was made by direct femtosecond 780 nm/100 fs laser writing in the SZ2080™ polymer with a photo-initiator. Optical characterisation of the positive and negative fraxicons is presented. Numerical modelling of fraxicon optical performance under illumination by incoherent and spatially extended light sources is compared with the ideal case of plane-wave illumination. Considering the potential for rapid replication in soft polymers and resists, this approach holds great promise for the most demanding technological applications.

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Section: Theory: Fraxicon Illuminated By An Incoherent and Extended S...supporting

confidence: 81%

Fraxicon for Optical Applications with Aperture ∼1 mm: Characterisation Study

Mu,

Smith,

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…The temporal coherence length for a Gaussian fit of LED emission spectra is given by L tc = 4 ln 2 π λ 2 0 ∆λ , where λ 0 is the central emission wavelength and ∆λ is its width or Full-Width-at-Half-Maximum (FWHM), and it coincides well with experimentally measured values L tc ≈ 2 µm using Mach-Zehnder interferometry [13].…”

Section: Theory: Fraxicon Illuminated By An Incoherent and Extended S...supporting

confidence: 80%

Fraxicon for Optical Applications with Aperture ∼1 mm

Mu,

Smith,

et al. 2023

Preprint

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Emerging applications of optical technologies are driving the development of miniaturised light sources, which in turn require the fabrication of matching micro-optical elements with sub-1 mm cross sections and high optical quality. This is particularly challenging for spatially-constrained biomedical applications where reduced dimensionality is required, such as endoscopy, optogenetics, or optical implants. Planarisation of a lens by the Fresnel lens approach was adapted for a conical lens (axicon) and was made by direct femtosecond 780 nm/100 fs laser writing in SZ2080™polymer with photo-initiator. Optical characterisation of the positive and negative fraxicons is presented. Numerical modeling of fraxicon optical performance under illumination by incoherent and spatially extended light sources is compared with the ideal case of plane wave illumination. Considering the potential for rapid replication in soft polymers and resists, this approach holds great promise for the most demanding technological applications.

show abstract