Speckle-free laser imaging using random laser illumination
TLDR
Exploiting the low spatial coherence of specifically designed random lasers, researchers demonstrate speckle-free full-field imaging in the regime of intense optical scattering.Abstract:
Exploiting the low spatial coherence of specifically designed random lasers, researchers demonstrate speckle-free full-field imaging in the regime of intense optical scattering. Their results show that the quality of images generated from random-laser illumination is superior to those generated from spatially coherent illumination.read more
Citations
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Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites
Sergii Yakunin,Sergii Yakunin,Loredana Protesescu,Loredana Protesescu,Franziska Krieg,Franziska Krieg,Maryna I. Bodnarchuk,Maryna I. Bodnarchuk,Georgian Nedelcu,Georgian Nedelcu,Markus Humer,Gabriele De Luca,Manfred Fiebig,Wolfgang Heiss,Maksym V. Kovalenko,Maksym V. Kovalenko +15 more
TL;DR: Low-threshold amplified spontaneous emission and lasing from ∼10 nm monodisperse colloidal nanocrystals of caesium lead halide perovskites CsPbX3 are reported.
Journal ArticleDOI
Organic Lasers: Recent Developments on Materials, Device Geometries, and Fabrication Techniques
TL;DR: A comprehensive review of the developments in the field over the past decade is provided, discussing recent advances in organic gain materials, which are today often based on solid-state organic semiconductors, as well as optical feedback structures, and device fabrication.
Journal ArticleDOI
Random distributed feedback fibre lasers
Sergei K. Turitsyn,Sergei K. Turitsyn,Sergey A. Babin,Dmitry V. Churkin,Dmitry V. Churkin,Ilya D. Vatnik,Maxim Nikulin,Evgenii Podivilov +7 more
TL;DR: In this paper, the authors present a review of the current state of the art in the field of random distributed feedback feedback laser (RDFL) generation, and discuss existing and future applications of random fiber laser, including telecommunication and distributed long reach sensor systems.
Journal ArticleDOI
Speckle-scale focusing in the diffusive regime with time reversal of variance-encoded light (TROVE)
Benjamin Judkewitz,Benjamin Judkewitz,Ying Min Wang,Roarke Horstmeyer,Alexandre Mathy,Changhuei Yang +5 more
TL;DR: This work introduces a new approach, time reversal of variance-encoded light (TROVE), which demixes these spatial modes by variance- Encoded light to break the resolution barrier imposed by the ultrasound, and enables optical focusing and imaging with diffuse light at unprecedented, speckle-scale lateral resolution.
Journal ArticleDOI
Lasing in nanocomposite random media
Feng Luan,Bobo Gu,Bobo Gu,Anderson S. L. Gomes,Ken-Tye Yong,Shuangchun Wen,Shuangchun Wen,Paras N. Prasad,Paras N. Prasad +8 more
TL;DR: In this article, the authors describe the physics that explains the optical properties of disordered nanostructures and scattering used to develop the random lasers, particularly discussing the role of modes in random lasers.
References
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Journal ArticleDOI
Optical coherence tomography
David Huang,Eric A. Swanson,Charles P. Lin,Joel S. Schuman,William G. Stinson,Warren Chang,Michael R. Hee,Thomas J. Flotte,Kenton W. Gregory,Carmen A. Puliafito,James G. Fujimoto +10 more
TL;DR: OCT as discussed by the authors uses low-coherence interferometry to produce a two-dimensional image of optical scattering from internal tissue microstructures in a way analogous to ultrasonic pulse-echo imaging.
Book
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Leonard Mandel,Emil Wolf +1 more
TL;DR: In this article, the authors present a systematic account of optical coherence theory within the framework of classical optics, as applied to such topics as radiation from sources of different states of coherence, foundations of radiometry, effects of source coherence on the spectra of radiated fields, and scattering of partially coherent light by random media.
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Optical Coherence Tomography
TL;DR: The optical coherence tomograph is a new, noninvasive technical device that can obtain cross-sectional, high-resolution images-optical coherencetomographs (OCT)-of the retina that permits an accurate evaluation of various macular and chorioretinal pathologies and the early detection of glaucomatous damage.
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Some fundamental properties of speckle
TL;DR: In this paper, the distribution of scale sizes in a speckle pattern (i.e., the Wiener spectrum) is investigated from a physical point of view, and it is shown that adding M uncorrelated speckles on an intensity basis can reduce the contrast by 1/√M.
Journal ArticleDOI
Random laser action in semiconductor powder
TL;DR: In this paper, the first observation of random laser action with coherent feedback in semiconductor powder was reported and the dependence of the lasing threshold intensity on the excitation volume agrees with the random laser theory.