Highly efficient superluminescent diodes and SLD-based combined light sources of red spectral range for applications in biomedical imaging

Андреева, Е. В.; Anikeev, A. S.; Il'chenko, S. N.; Chamorovskiy, A.; Shidlovski, Vladimir R.; Yakubovich, S D

doi:10.1117/12.2288246

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Given the wide range of applications in which they are needed, various types of SLDs have been developed. This includes near-ultraviolet and short-wavelength visible light based on GaN [52][53][54][55][56][57][58][59][60][61][62][63] , to red and NIR wavelengths based on GaAs and InP 24,50,[64][65][66][67][68][69][70][71] , to short-wavelength infrared (SWIR) based on InP and GaSb [72][73][74][75] .…”

Section: Low-coherence Semiconductor Light Sourcesmentioning

confidence: 99%

Low-coherence semiconductor light sources: devices and applications

Lu,

Alkhazragi,

Wang

et al. 2024

npj Nanophoton.

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Since the invention of the laser, there have been countless applications that were made possible or improved through exploiting its multitude of unique advantages. Most of these advantages are mainly due to the high degree of coherence of the laser light, which makes it directional and spectrally pure. Nevertheless, many fields require a moderate degree of temporal or spatial coherence, making conventional lasers unsuitable for these applications. This has brought about a great interest in partially coherent light sources, especially those based on semiconductor devices, given their efficiency, compactness, and high-speed operation. Here, we review the development of low-coherence semiconductor light sources, including superluminescent diodes, highly multimode lasers, and random lasers, and the wide range of applications in which they have been deployed. We highlight how each of these applications benefsits from a lower degree of coherence in space and/or time. We then discuss future potential applications that can be enabled using new types of low-coherence light.

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Section: Low-coherence Semiconductor Light Sourcesmentioning

confidence: 99%

Low-coherence semiconductor light sources: devices and applications

Lu,

Alkhazragi,

Wang

et al. 2024

npj Nanophoton.

View full text Add to dashboard Cite

show abstract

Chaotic-cavity surface-emitting lasers for optical wireless communication and low-speckle illumination

et al. 2023

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Though necessary and advantageous in many fields, the high coherence of lasers is detrimental to their performance in certain applications, including illumination, imaging, and projection. This is due to the formation of coherence artifacts, commonly known as speckles, resulting from the interference of randomly scattering spatially coherent photons. It is possible to resolve this issue by increasing the number of mutually incoherent modes emitted from the laser. In vertical-cavity surface-emitting lasers (VCSELs), this can be performed by designing them to have chaotic cavities. This paves the way toward their use in simultaneous illumination and communication scenarios. Herein, we show that chaotic-cavity broad-area VCSELs can achieve significantly broader modulation bandwidths (up to 5 GHz) and higher data rates (up to 12.6 GB/s) compared to other low-coherence light sources, with a lower speckle contrast. We further report a novel technique for lowering the speckle contrast by carefully designing the AC signal used for communication. We show that the apparent spatial coherence is dramatically decreased by inserting a short chirp signal between symbols. Using this method with a chaotic-cavity VCSEL, the number of apparent modes can be up to 450, compared to 88 modes measured from a conventional broad-area VCSEL (a fivefold increase). In light of the recent advances in visible-light VCSELs, this work shows the potential of low-coherence surface-emitting lasers (LCSELs) in simultaneous illumination and optical wireless communication systems since they combine the high speed of lasers with the excellent illumination properties of light-emitting diodes.

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Modifying the coherence of vertical-cavity surface-emitting lasers using chaotic cavities

Alkhazragi¹,

Dong²,

Chen³

et al. 2023

Optica

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Vertical-cavity surface-emitting lasers (VCSELs) have been widely adopted in a variety of applications in recent years, with even more applications currently under research and development as a result of the emergence of visible-light VCSELs. Most of these applications make use of the ease of fabrication of large two-dimensional arrays of lasers, a feature unique to VCSELs that makes them scalable and versatile. However, applications that rely on the uniformity of the emitted beam in the transverse plane, such as illumination, projection, holography, and displays, suffer from the coherence artifacts (speckles) that reduce the quality of the formed images when coherent lasers are used. In this work, we show that, by using a chaotic-cavity D-shaped mesa, the coherence of broad-area VCSELs can be substantially reduced (the number of mutually incoherent modes is almost doubled, and the spectral full width at half-maximum is increased from ∼ 1.1 n m to ∼ 4.5 n m ), and the maximum achievable optical power is increased by up to 60%. The simplicity of implementing the reported design, which requires no additional fabrication steps, makes it a promising solution for applications that would benefit from the lower speckle density of the emitted light as well as those that rely on lower temporal coherence, such as time-domain optical coherence tomography and fiber-optic gyroscopes.

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Highly efficient superluminescent diodes and SLD-based combined light sources of red spectral range for applications in biomedical imaging

Cited by 3 publications

References 6 publications

Low-coherence semiconductor light sources: devices and applications

Low-coherence semiconductor light sources: devices and applications

Chaotic-cavity surface-emitting lasers for optical wireless communication and low-speckle illumination

Modifying the coherence of vertical-cavity surface-emitting lasers using chaotic cavities

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