Random laser illumination: an ideal source for biomedical polarization imaging?

Carvalho, Mariana; Lotay, Amrit; Kenny, Fiona; Girkin, John M.; Gomes, Anderson S. L.

doi:10.1117/12.2209623

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…Speckle-free imaging with low spatial coherence light source is also an attractive area in imaging applications that can be used to further improve the imaging quality and break through the resolution limit. Random lasers (RLs) generated from lasing process in disordered medium have been demonstrated to intrinsically possess low spatial coherence which is suitable for speckle-free imaging [12][13][14][15]. However, the applications of RLs are limited by its poor emission directionality and low output power.…”

Section: Introductionmentioning

confidence: 99%

High-power low spatial coherence random fiber laser

Ma¹,

Li²,

Guo³

et al. 2019

Opt. Express

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A high-power multi-transverse modes random fiber laser (RFL) is investigated by combining a master oscillator power-amplifier (MOPA) configuration with a segment of extra-large mode area step-index multimode fiber (MMF). Spatial coherence of the highpower multi-transverse modes RFL has been analyzed, which shows that speckle contrast is reduced dramatically with the output power increasing. In this way, considerably low speckle contrast of ~0.01 is achieved under high laser power of ~56 W, which are the records for multi-transverse modes RFLs in both spatial coherence and output power. This work paves a way to develop high-power RFLs with very low spatial coherence for wide-range speckle-free imaging and free-space communication applications.

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Section: Introductionmentioning

confidence: 99%

High-power low spatial coherence random fiber laser

Ma¹,

Li²,

Guo³

et al. 2019

Opt. Express

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“…Moreover, the disordered gain medium can be fabricated at low cost and painted on arbitrarily shaped substrates . Injection of the small gain medium to a particular biological tissue can distinguish themselves with distinct emission properties, e.g., spectrum and lifetime, which leads to utilization for bioimaging and diagnosis . The limitations of laser modes and frequency due to the 2π-phase mirror rebounding in regular lasers have been broken in random ones.…”

mentioning

confidence: 99%

“…2 Injection of the small gain medium to a particular biological tissue can distinguish themselves with distinct emission properties, e.g., spectrum and lifetime, which leads to utilization for bioimaging and diagnosis. 3 The limitations of laser modes and frequency due to the 2π-phase mirror rebounding in regular lasers have been broken in random ones. In this scenario, the light experiences multiple scattering in the systems that enable spectrum blank filling, 4 a white laser source, 4−6 and speckle-free imaging.…”

mentioning

confidence: 99%

Graphdiyne Nanosheets for Multicolor Random Lasers

Jiang

Zhao

Bao

et al. 2020

ACS Appl. Nano Mater.

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By breaking the restriction of mirrors, random lasers from a disordered medium have found unique applications spanning from displays to spectroscopy to biomedical treatments to light fidelity. Gain media in two dimensions with distinct physical and chemical properties may lead to the next generation of random lasers. Graphdiyne (GDY), a two-dimensional graphene allotrope with intrigued carbon hybridization, atomic lattice, and optoelectronic properties, has attracted increasing attention recently. Herein, the photoemission characteristics and photocarrier dynamics in GDY are systematically studied, and multicolor random lasers have been unprecedently realized using GDY nanosheets as the gain. Considering the well biocompatibility of GDY, these results may look ahead to a plethora of potential applications in the nanotechnology platform based on GDY.

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“…The feedback is provided by a scattering medium [21][22][23][24][25], apart from advantages in RL, RFL has the qualities of quasi one-dimension and high output power, flexible lasing wavelength, and robust structure. The RFL is demonstrated to be suitable for high power low-coherence full-field real-time speckle free imaging [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Dental Imaging With Near-Infrared Transillumination Using Random Fiber Laser

et al. 2020

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Contrary to the conventional detection method like radiography, the near infrared light source has been demonstrated to be suitable for dental imaging due to different reflectivity among enamel, dentin, and caries lesion. In this paper, three light sources with different bandwidths based on a transillumination method are compared. The contrast among enamel, dentin, and caries lesion is calculated in different situations. The experimental results show that the random fiber laser has the best comprehensive quality in dental imaging due to its high spectral density, low coherence, and deep penetration. This work provides a guidance for light source selection in dental imaging.

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Random laser illumination: an ideal source for biomedical polarization imaging?

Cited by 11 publications

References 11 publications

High-power low spatial coherence random fiber laser

High-power low spatial coherence random fiber laser

Graphdiyne Nanosheets for Multicolor Random Lasers

Dental Imaging With Near-Infrared Transillumination Using Random Fiber Laser

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