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Adaptive optical waveguide system for large-area and overheating-preventing phototherapy in deep tissue. [PDF]
Nat CommunWang Z +5 more
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Closed-loop tactile-visual interactivity via chip-free luminescent fibers enabled by capacitive coupling. [PDF]
Sci AdvWu XE +12 more
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Laser optical feedback tomography
Biomedical Optics, 1999We describe a new method for imaging in three-dimensional turbid media, laser optical feedback tomography. This technique is based on the resonant sensitivity of a short-cavity laser to frequency-shifted optical feedback from ballistic photons retrodiffused from the medium.
E, Lacot, R, Day, F, Stoeckel
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Laser optical feedback imaging insensitive to parasitic optical feedback
Applied Optics, 2007We present an optical architecture for the laser optical feedback imaging (LOFI) technique that makes it possible to avoid the effect of the optical parasitic reflections introduced by the optical components located between the laser source and the studied object. These reflections damage phase and amplitude information contained in the images.
Olivier, Jacquin +3 more
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Intracavity feedback optical trapping
Il Nuovo Cimento C, 2022Several research groups have integrated feedback control with optical trapping to improve performance, e.g., for force or position control. Among the different proposed approaches, using the feedback when trapping inside a laser cavity stands out for several reasons, namely, trapping can occur at lower optical intensities, reducing photodamage, and ...
Ciarlo, Antonio +5 more
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Digital feedback optical vibrometer
2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2016Self-mixing interferometer allows to realize different kind of measuring systems, especially vibrometers. This work describes the design and implementation of a digital feedback-loop, acting on the laser pump current, able to lock the interferometer to half-fringe, and to measure the target vibration by estimating the feedback error signal. The digital
NORGIA, MICHELE +4 more
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Optical Trapping and Optical Micromanipulation XV, 2018
Feedback traps can manipulate particles arbitrarily. In a feedback trap, a position detector detects the particle’s position, a computer calculates the necessary force to be applied based on the position in the “virtual potential,” which is applied to the particle. The process is repeated with as fast a loop rate as practical.
Kumar, Avinash, Bechhoefer, John
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Feedback traps can manipulate particles arbitrarily. In a feedback trap, a position detector detects the particle’s position, a computer calculates the necessary force to be applied based on the position in the “virtual potential,” which is applied to the particle. The process is repeated with as fast a loop rate as practical.
Kumar, Avinash, Bechhoefer, John
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Optical Feedback Buffering Strategies
2005This paper considers the performance of fixed and incremental feedback buffers in an optical switch, and compares this with the performance of a feedback buffer configuration implementing switchable delay lines. It is shown that for a medium sized switch the switchable delay line implementation outperforms the other configurations, although for a large
Geldenhuys, Ronelle +3 more
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Bistable optical spatial device using direct optical feedback
Optics Letters, 1978Analysis and implementation of a set of optically controlled optical flip-flops on the surface of a liquid-crystal spatial- light modulator (SLM) are presented. The elementary system consists of a pair of image elements on the SLM whose input and output are coupled to each other by purely optical means.
U K, Sengupta +2 more
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