Superluminescent Diode Light Sources for OCT

Shidlovski, Vladimir R.

doi:10.1007/978-3-540-77550-8_9

Cited by 12 publications

(12 citation statements)

References 39 publications

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“…This depends on the tissue type as well as an increase in the longer wavelength and optical power [6]. The axial resolution can be 1 μm to 10 μm depending on the light source spectral shape [7][8]; decreasing in the value with the bandwidth and increasing in the value with the central wavelength [3].…”

Section: Oct Methodsmentioning

confidence: 99%

“…This development led to their use in other sensing systems including Faraday-effect electric current sensors and distributed Bragg-grating sensor systems [7]. This was soon followed in the 1990s with their application to the testing of telecommunications wavelength division multiplexing systems [17] and various low coherence interferometry systems including OCT due to their small size, ease of use, low cost, and ten-fold improvement (10 mW) in the output power at that time [7].…”

Section: Super Luminescent Diodementioning

confidence: 99%

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Modeling of low coherence interferometry using broadband multi-Gaussian light sources

et al. 2012

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Using a low coherence interferometry (LCI) model, a comparison of broadband single-Gaussian and multi-Gaussian light sources has been undertaken. For single-Gaussian sources, the axial resolution improves with the source bandwidth, confirming the coherence length relation that the resolution for single Gaussian sources improves with increasing spectral bandwidth. However, narrow bandwidth light sources result in interferograms with overlapping strata peaks and the loss of individual strata information. For multiple-Gaussian sources with the same bandwidth, spectral side lobes increase, reducing A-scan reliability to show accurate layer information without eliminating the side lobes. The simulations show the conditions needed for the resolution of strata information for broadband light sources using both single and multiple Gaussian models. The potential to use the model to study optical coherence tomography (OCT) light sources including super luminescent diodes (SLDs), as reviewed in this paper, as well as optical delay lines and sample structures could better characterize these LCI and OCT elements. Forecasting misinformation in the interferogram may allow preliminary corrections. With improvement to the LCI-OCT model, more applications are envisaged.

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Section: Oct Methodsmentioning

confidence: 99%

Section: Super Luminescent Diodementioning

confidence: 99%

Modeling of low coherence interferometry using broadband multi-Gaussian light sources

et al. 2012

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“…First, the optical gain of these SLDs is broadened by their higher density of states, compared to bulk SLDs. Secondly, transition from different sub-bands in quantum-well active layers, can be used to broaden the SLD spectrum [3]. This broadening is dependent on drive current, however as broadening increases the spectrum can become bi-lobed [10], resulting in expected spurious side lobes appearing in the interferogram, as mentioned previously.…”

Section: Introductionmentioning

confidence: 94%

“…In LCI and OCT a low coherent/broadband near infrared source is used to generate a reflection intensity map of a material's (LCI) or tissue's (OCT) cross section, having 1 -3 mm penetration depth [1] depending on tissue type and wavelength, and 1 -10 μm axial resolution depending on the bandwidth, central wavelength [2] and the light source spectral shape [3].…”

Section: Introductionmentioning

confidence: 99%

“…Their optical spectrum width varied from 15 -20 nm for 800 nm AlGaAs emitters to 30 -40 nm for 1300 -1550 nm InGaAsP SLDs. Broadening the spectrum was attempted for these bulk active layer SLDs by including a "stacked-layer-SLD" with two active layers of different material [3]. The most significant progress in spectral broadening was made with the demonstration of quantum-well SLDs.…”

Section: Introductionmentioning

confidence: 99%

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Low coherence interferometry modelling using combined broadband Gaussian light sources

et al. 2012

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Using a Low Coherence Interferometry (LCI) model, a comparison of broadband single-Gaussian and multi-Gaussian light sources has been undertaken. For single-Gaussian sources, the axial resolution improved with source bandwidth, confirming the coherence length relation that resolution for single Gaussian sources improves with increasing spectral bandwidth. However, narrow bandwidth light sources resulted in interferograms with overlapping strata peaks and the loss of individual strata information. For multiple-Gaussian sources with the same bandwidth, spectral side lobes increased, reducing A-scan reliability to show accurate layer information without eliminating the side lobes. The simulations show the conditions needed for resolution of strata information for broadband light sources using both single and multiple Gaussian models. The potential to use the model to study LCI and OCT light sources, optical delays and sample structures can better characterise these LCI and OCT elements. Forecasting misinformation in the interferogram, may allow preliminary corrections. With improvements to the LCI-OCT model, more applications are envisaged.

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