Two-photon imaging through a multimode fiber

Morales-Delgado, Edgar E.; Psaltis, Demetri; Moser, Christophe

doi:10.1364/oe.23.032158

Cited by 109 publications

(64 citation statements)

References 39 publications

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“…When we compare with the spatiotemporal dissipative soliton lasers, the self-similar spatiotemporal laser produces a better beam quality. We believe a possible explanation is that the phase of each of the multiple fiber modes are such that their interference produces a near-Gaussian beam similarly to what was demonstrated for single-pass beamshaping with multimode fibers [28,29]. This particular phase condition may automatically be selected by the laser cavity to produce a beam which has smaller loss after passing through the spatial filter and coupled to the 10 m core fiber.…”

mentioning

confidence: 71%

Spatiotemporal self-similar fiber laser

Teğin

Kakkava

Rahmani

et al. 2019

Optica

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116

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In this Letter, we demonstrate, to the best of our knowledge, the first spatiotemporally mode-locked fiber laser with self-similar pulse evolution. The multimode fiber oscillator generates parabolic amplifier similaritons at 1030 nm with 90 mW average power, 2.3 ps duration, and 37.9 MHz repetition rate. Remarkably, we observe experimentally a near-Gaussian beam quality (M 2 <1.4) at the output of the highly multimode fiber. The output pulses are compressed to 192 fs via an external grating compressor. Numerical simulations are performed to investigate the cavity dynamics which confirm experimental observations of selfsimilar pulse propagation. The reported results open a new direction to investigate new types of pulse besides beam shaping and nonlinear dynamics in spatiotemporal mode-locked fiber lasers.

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mentioning

confidence: 71%

Spatiotemporal self-similar fiber laser

Teğin

Kakkava

Rahmani

et al. 2019

Optica

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116

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“…Full a priori knowledge of the input image and fibre * Daniele.Faccio@glasgow.ac.uk, Roderick.Murray-Smith@glasgow.ac.uk details could allow to numerically model the optical propagation [6], reconstruct the transmission matrix and then unscramble the output data, but in practice this can be extremely hard. Methods have been developed that allow to shape the input beam profile so as to focus the output field into a single spot that can then be scanned [7][8][9][10][11] with an emphasis on endoscopy [12][13][14][15]. Notwithstanding this notable progress, the development of a viable method that allows to unscramble the speckle patterns and thus retrieve high resolution, general image information in real time is an open challenge.…”

Section: Introductionmentioning

confidence: 99%

Transmission of natural scene images through a multimode fibre

et al. 2019

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The optical transport of images through a multimode fibre remains an outstanding challenge with applications ranging from optical communications to neuro-imaging. State of the art approaches either involve measurement and control of the full complex field transmitted through the fibre or, more recently, training of artificial neural networks that however, are typically limited to image classes belong to the same class as the training data set. Here we implement a method that statistically reconstructs the inverse transformation matrix for the fibre. We demonstrate imaging at high frame rates, high resolutions and in full colour of natural scenes, thus demonstrating general-purpose imaging capability. Real-time imaging over long fibre lengths opens alternative routes to exploitation for example for secure communication systems, novel remote imaging devices, quantum state control processing and endoscopy.

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“…In parallel to the progress of photo-polymerization, several techniques have been developed to focus and scan light patterns [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] and optical pulses [40][41][42][43][44] through scattering media and multimode optical fibers. Different than a lens, the multimode fiber itself does not directly allow the transmission of images or focused optical pulses.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional microfabrication through a multimode optical fiber

Morales-Delgado¹,

Urio²,

Conkey³

et al. 2017

Opt. Express

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Additive manufacturing, also known as 3D printing, is an advanced manufacturing technique that allows the fabrication of arbitrary macroscopic and microscopic objects. All 3D printing systems require large optical elements or nozzles in proximity to the built structure. This prevents their use in applications in which there is no direct access to the area where the objects have to be printed. Here, we demonstrate three-dimensional microfabrication based on two-photon polymerization (TPP) with sub diffraction-limited resolution through an ultra-thin, 50 mm long printing nozzle of 560 µm in diameter. Using wavefront shaping, femtosecond infrared pulses are focused and scanned through a multimode optical fiber (MMF) inside a photoresist that polymerizes via two-photon absorption. We show the construction of arbitrary 3D structures of 500 nm resolution on the other side of the fiber. To our knowledge, this is the first demonstration of microfabrication through a multimode optical fiber. Our work represents a new area which we refer to as endofabrication.

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Two-photon imaging through a multimode fiber

Cited by 109 publications

References 39 publications

Spatiotemporal self-similar fiber laser

Spatiotemporal self-similar fiber laser

Transmission of natural scene images through a multimode fibre

Three-dimensional microfabrication through a multimode optical fiber

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