Imaging of spectral-domain optical coherence tomography using a superluminescent diode based on InAs quantum dots emitting broadband spectrum with Gaussian-like shape

Shibata, Hiroshi; Ozaki, Nobuhiko; Yasuda, Tatsuya; Ohkouchi, Shunsuke; Ikeda, Naoki; Ohsato, Hirotaka; Watanabe, Eiichiro; Sugimoto, Yoshimasa; Furuki, Kenji; Miyaji, Kunio; Hogg, R. A.

doi:10.7567/jjap.54.04dg07

Cited by 18 publications

(33 citation statements)

References 33 publications

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“…In our previous work, 21,22 the emission wavelength was extended to approximately $1100 nm from a chip with single contact under a current density of 400 A/cm 2 . By introducing the segmented contacts, it was possible to increase the current density up to 3000 A/cm 2 in a single segment, which is approximately 8 times higher than that for the previous device, and emission from the higher energy state (ES2) emerged.…”

Section: Resultsmentioning

confidence: 99%

“…The axial resolution of the OCT image was thus determined to be approximately 4 lm, which is half of that of our previous result using a QD-SLD with a single contact. 22 This improvement of the axial resolution results from the modification of the prepared contacts; the segmented contacts enable an increase of J and extension of the emission wavelength range. Based on the above results, we conclude that the QD-SLD with segmented contacts is a promising light source for high-resolution OCT imaging.…”

Section: Oct Imagingmentioning

confidence: 99%

“…22 However, the bandwidth of the electroluminescence (EL) was limited because the emission was limited to that from GS and ES1 due to a limited injection current density (J) through the use of a single contact electrode.…”

Section: Introductionmentioning

confidence: 99%

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Superluminescent diode with a broadband gain based on self-assembled InAs quantum dots and segmented contacts for an optical coherence tomography light source

Ozaki

Childs

Sarma

et al. 2016

Journal of Applied Physics

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Articles you may be interested inBroadband InGaAs tapered diode laser sources for optical coherence radar and coherence tomography Appl. Phys. Lett. 86, 191101 (2005) We report a broadband-gain superluminescent diode (SLD) based on self-assembled InAs quantum dots (QDs) for application in a high-resolution optical coherence tomography (OCT) light source. Four InAs QD layers, with sequentially shifted emission wavelengths achieved by varying the thickness of the In 0.2 Ga 0.8 As strain-reducing capping layers, were embedded in a conventional p-n heterojunction comprising GaAs and AlGaAs layers. A ridge-type waveguide with segmented contacts was formed on the grown wafer, and an as-cleaved 4-mm-long chip (QD-SLD) was prepared. The segmented contacts were effective in applying a high injection current density to the QDs and obtaining emission from excited states of the QDs, resulting in an extension of the bandwidth of the electroluminescence spectrum. In addition, gain spectra deduced with the segmented contacts indicated a broadband smooth positive gain region spanning 160 nm. Furthermore, OCT imaging with the fabricated QD-SLD was performed, and OCT images with an axial resolution of $4 lm in air were obtained. These results demonstrate the effectiveness of the QD-SLD with segmented contacts as a highresolution OCT light source. V C 2016 AIP Publishing LLC.[http://dx

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Section: Resultsmentioning

confidence: 99%

Section: Oct Imagingmentioning

confidence: 99%

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Superluminescent diode with a broadband gain based on self-assembled InAs quantum dots and segmented contacts for an optical coherence tomography light source

Ozaki

Childs

Sarma

et al. 2016

Journal of Applied Physics

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“…The most important characteristics of SS-OCT are dependence of difference in optical path length as different depth positions. This dependency is estimated to measure point spread function (PSF) [13] [14] as various positions with respect to the difference of length between reference mirror and sample mirror. The PSF means profile of optical axis in OCT system.…”

Section: Point Spread Function In Oct Systemmentioning

confidence: 99%

Development of Optical Coherence Tomography Using KTN Optical Probe

Choi¹,

Ohmi²,

Komatsu³

et al. 2017

OPJ

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We have developed optical coherence tomography system with KTN optical probe for a diagnosis in the orthopedic surgery fields. The present system demonstrates that biological image was measured by using KTN optical scanner for having degree of freedom in sample arm as optical coherence tomography. In addition, the developed optical coherence tomography (OCT) system has shown feasibility for imaging biological tissue in orthopedics. The system was shown to have a resolution 14.2 μm for biological tissue in few mm depths. The sensitivity to be measured is 92.3 dB.

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“…OCT makes use of the coherent properties of light to conduct high-resolution, non-invasive, in vivo imaging of biological tissue, most notably of the eye and skin. Since OCT was first reported in 1991 by Huang et al, [17] axial resolution and imaging speed have both been increased, with the former limited by the device central wavelength and bandwidth [18]. In lieu of broad bandwidth GaN SLEDs and in an attempt to access shorter wavelengths, super-continuum lasers [19] and non-linear fibre-based light sources [20] have been demonstrated.…”

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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Imaging of spectral-domain optical coherence tomography using a superluminescent diode based on InAs quantum dots emitting broadband spectrum with Gaussian-like shape

Cited by 18 publications

References 33 publications

Superluminescent diode with a broadband gain based on self-assembled InAs quantum dots and segmented contacts for an optical coherence tomography light source

Superluminescent diode with a broadband gain based on self-assembled InAs quantum dots and segmented contacts for an optical coherence tomography light source

Development of Optical Coherence Tomography Using KTN Optical Probe

Gallium nitride light sources for optical coherence tomography

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