Superluminescent Diode Light Sources for OCT

Shidlovski, Vladimir R.

doi:10.1007/978-3-319-06419-2_18

Cited by 7 publications

(8 citation statements)

References 48 publications

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“…2) were digitally generated from the spectra provided in Shidlovski. 11 Though the bulk SLD [ Fig. 2(a)] spectral shape is similar to the previously simulated spectra, 7 having no satellite peaks in its PSF, its Gaussian resolution limit from Eq.…”

Section: Bulk Sldsupporting

confidence: 74%

“…11,12 For a Gaussian spectral light source, the axial resolution (Δz) is the coherence length, L C , of the source: 3 Δz ¼ 2 ln 2λ 2 0 πΔλ ; (1) for which λ 0 is the source central wavelength and Δλ is the spectral bandwidth (FWHM) of the power spectrum. 11,12 For a Gaussian spectral light source, the axial resolution (Δz) is the coherence length, L C , of the source: 3 Δz ¼ 2 ln 2λ 2 0 πΔλ ; (1) for which λ 0 is the source central wavelength and Δλ is the spectral bandwidth (FWHM) of the power spectrum.…”

Section: Oct Light Source Characteristicsmentioning

confidence: 99%

“…2(a)] is shown for an AlGaAs Bulk SLD. 11 These spectra (Fig. 2) were digitally generated from the spectra provided in Shidlovski.…”

Section: Bulk Sldmentioning

confidence: 99%

“…13) and over-driven SLD (Fig. 11 Furthermore, to gain the SDRL benefit for this MQW SLD, the FSI needs to be subtracted from the subsurface A-scan. Furthermore, the average SDRL for all three drive current conditions for the A-scan only are not significantly different due to the large variation of the SDRLs between strata In summary, for QW SLDs, the resolution limit "sweet spot" is drive current dependent, while this is not the case for bulk SLDs.…”

Section: Multiple Qw Sld With Variable Drive Currentmentioning

confidence: 99%

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Characterizing the resolvability of real superluminescent diode sources for application to optical coherence tomography using a low coherence interferometry model

et al. 2014

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The axial resolution is a critical parameter in determining whether optical coherent tomography (OCT) can be used to resolve specific features in a sample image. Typically, measures of resolution have been attributed to the light source characteristics only, including the coherence length and the point spread function (PSF) width of the OCT light sources. The need to cost effectively visualize the generated PSF and OCT cross-correlated interferogram (A-scan) using many OCT light sources have led to the extrinsic evolution of the OCT simulation model presented. This research indicated that empirical resolution in vivo, as well as depending on the light source's spectral characteristics, is also strongly dependent on the optical characteristics of the tissue, including surface reflection. This research showed that this reflection could be digitally removed from the A-scan of an epithelial model, enhancing the stratum depth resolution limit (SDRL) of the subsurface tissue. Specifically, the A-scan portion above the surface, the front surface interferogram, could be digitally subtracted, rather than deconvolved, from the subsurface part of each A-scan. This front surface interferogram subtraction resulted in considerably reduced empirical SDRLs being much closer to the superluminescent diodes' resolution limits, compared to the untreated A-scan results.

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Section: Bulk Sldsupporting

confidence: 74%

Section: Oct Light Source Characteristicsmentioning

confidence: 99%

“…2(a)] is shown for an AlGaAs Bulk SLD. 11 These spectra (Fig. 2) were digitally generated from the spectra provided in Shidlovski.…”

Section: Bulk Sldmentioning

confidence: 99%

Section: Multiple Qw Sld With Variable Drive Currentmentioning

confidence: 99%

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Characterizing the resolvability of real superluminescent diode sources for application to optical coherence tomography using a low coherence interferometry model

et al. 2014

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“…This showed in vivo imaging of the human skin using OCT is possible at ~400 nm and ultraviolet light is able to propagate to the dermal layer [21]. However, these are complex systems, and it has already been identified that if broader bandwidths can be reached for GaN SLEDs, sub-cellular resolution is possible [22], with an enhancement in lateral resolution also likely. Although methods of cavity suppression have been proposed [13], [23], only limited research has been conducted on the use and role of absorbers in GaN SLEDs.…”

Section: Introductionmentioning

confidence: 99%

Gallium nitride light sources for optical coherence tomography

et al. 2017

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The advent of optical coherence tomography (OCT) has permitted high-resolution, non-invasive, in vivo imaging of the eye, skin and other biological tissue. The axial resolution is limited by source bandwidth and central wavelength. With the growing demand for short wavelength imaging, super-continuum sources and non-linear fibre-based light sources have been demonstrated in tissue imaging applications exploiting the near-UV and visible spectrum. Whilst the potential has been identified of using gallium nitride devices due to relative maturity of laser technology, there have been limited reports on using such low cost, robust devices in imaging systems.A GaN super-luminescent light emitting diode (SLED) was first reported in 2009, using tilted facets to suppress lasing, with the focus since on high power, low speckle and relatively low bandwidth applications. In this paper we discuss a method of producing a GaN based broadband source, including a passive absorber to suppress lasing. The merits of this passive absorber are then discussed with regards to broad-bandwidth applications, rather than power applications. For the first time in GaN devices, the performance of the light sources developed are assessed though the point spread function (PSF) (which describes an imaging systems response to a point source), calculated from the emission spectra. We show a sub-7µm resolution is possible without the use of special epitaxial techniques, ultimately outlining the suitability of these short wavelength, broadband, GaN devices for use in OCT applications.

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Broadband superluminescent diode light source at 1330 nm with 180 nm spectral bandwidth

Kostin

Chamorovskiy²,

Yakubovich

2015

Electron. lett.

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A broadband light source that is based on a combination of three spectrally matched superluminescent diodes is demonstrated. The mean wavelength of the source is 1330 nm. The 3 dB spectrum width exceeds 180 nm and the 10 dB spectrum width is 220 nm. The spectral flatness is better than 2 dB and the residual spectral modulation is <0.5 dB for the whole spectral bandwidth of the source. The optical power coupled in a single-mode fibre is 4 mW.

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Superluminescent Diode Light Sources for OCT

Cited by 7 publications

References 48 publications

Characterizing the resolvability of real superluminescent diode sources for application to optical coherence tomography using a low coherence interferometry model

Characterizing the resolvability of real superluminescent diode sources for application to optical coherence tomography using a low coherence interferometry model

Gallium nitride light sources for optical coherence tomography

Broadband superluminescent diode light source at 1330 nm with 180 nm spectral bandwidth

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