The Experts below are selected from a list of 3180 Experts worldwide ranked by ideXlab platform
Paul Campbell - One of the best experts on this subject based on the ideXlab platform.
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jitter reduction using native fiducials in Rotating Mirror ultra fast microphotography
Optics Express, 2014Co-Authors: B H T Goh, B C Khoo, W H I Mclean, Paul CampbellAbstract:Rotating Mirror cameras represent a workhorse technology for high speed imaging in the MHz framing regime. The technique requires that the target image be swept across a series of juxtaposed CCD sensors, via reflection from a rapidly Rotating Mirror. Employing multiple sensors in this fashion can lead to spatial jitter in the resultant video file, due to component misalignments along the individual optical paths to each CCD. Here, we highlight that static and dynamic fiducials can be exploited as an effective software-borne countermeasure to jitter, suppressing the standard deviation of the corrected file relative to the raw data by up to 88.5% maximally, and 66.5% on average over the available range of framing rates. Direct comparison with industry-standard algorithms demonstrated that our fiducial-based strategy is as effective at jitter reduction, but typically also leads to an aesthetically superior final form in the post-processed video files.
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on the accuracy of framing rate measurements in ultra high speed Rotating Mirror cameras
Optics Express, 2011Co-Authors: Michael Conneely, Hans O Rolfsnes, Charles Main, David Mcgloin, Paul CampbellAbstract:Rotating Mirror systems based on the Miller Principle are a mainstay modality for ultra-high speed imaging within the range 1-25 million frames per second. Importantly, the true temporal accuracy of observations recorded in such cameras is sensitive to the framing rate that the system directly associates with each individual data acquisition. The purpose for the present investigation was to examine the validity of such system-reported frame rates in a widely used commercial system (a Cordin 550-62 model) by independently measuring the framing rate at the instant of triggering. Here, we found a small but significant difference between such measurements: the average discrepancy (over the entire spectrum of frame rates used) was found to be 0.66 ± 0.48%, with a maximum difference of 2.33%. The principal reason for this discrepancy was traced to non-optimized sampling of the Mirror rotation rate within the system protocol. This paper thus serves three purposes: (i) we highlight a straightforward diagnostic approach to facilitate scrutiny of Rotating-Mirror system integrity; (ii) we raise awareness of the intrinsic errors associated with data previously acquired with this particular system and model; and (iii), we recommend that future control routines address the sampling issue by implementing real-time measurement at the instant of triggering.
Toyohiko Yatagai - One of the best experts on this subject based on the ideXlab platform.
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optical rotation compensation for a holographic 3d display with a 360 degree horizontal viewing zone
Applied Optics, 2016Co-Authors: Yusuke Sando, Daisuke Barada, Toyohiko YatagaiAbstract:A method for a continuous optical rotation compensation in a time-division-based holographic three-dimensional (3D) display with a Rotating Mirror is presented. Since the coordinate system of wavefronts after the Mirror reflection rotates about the optical axis along with the rotation angle, compensation or cancellation is absolutely necessary to fix the reconstructed 3D object. In this study, we address this problem by introducing an optical image rotator based on a right-angle prism that rotates synchronously with the Rotating Mirror. The optical and continuous compensation reduces the occurrence of duplicate images, which leads to the improvement of the quality of reconstructed images. The effect of the optical rotation compensation is experimentally verified and a demonstration of holographic 3D display with the optical rotation compensation is presented.
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holographic 3d display observable for multiple simultaneous viewers from all horizontal directions by using a time division method
Optics Letters, 2014Co-Authors: Yusuke Sando, Daisuke Barada, Toyohiko YatagaiAbstract:A holographic three-dimensional display system with a viewing angle of 360°, by using a high-speed digital microMirror device (DMD), has been proposed. The wavefront modulated by the DMD enters a Rotating Mirror tilted vertically downward. The synchronization of the Rotating Mirror and holograms displayed on the DMD allows for the reconstruction of a wavefront propagating in all horizontal directions. An optical experiment has been demonstrated in order to verify our proposed system. Binocular vision is realized from anywhere within the horizontal plane. Our display system enables simultaneous observation by multiple viewers at an extremely close range.
A Heinrich - One of the best experts on this subject based on the ideXlab platform.
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mid infrared q switched er yag laser for medical applications
Laser Physics Letters, 2010Co-Authors: M Skorczakowski, Jacek Swiderski, Wieslaw Pichola, Piotr Nyga, Andrzej Zajac, M Maciejewska, Lukasz Galecki, Jan Kasprzak, Simon Gross, A HeinrichAbstract:The 2.94 μm Er:YAG laser Q-switched mechanically by a Rotating Mirror was developed. The laser generated pulses of 30 mJ energy and duration below 290 ns, which corresponds to over 100 kW peak power. It operated at the repetition rate of up to 25 Hz. To our knowledge it is the most powerful erbium laser operating at so high repetition rate. The developed laser can be successfully applied in medicine – e.g. in microsurgery of soft biological tissues.
Yusuke Sando - One of the best experts on this subject based on the ideXlab platform.
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optical rotation compensation for a holographic 3d display with a 360 degree horizontal viewing zone
Applied Optics, 2016Co-Authors: Yusuke Sando, Daisuke Barada, Toyohiko YatagaiAbstract:A method for a continuous optical rotation compensation in a time-division-based holographic three-dimensional (3D) display with a Rotating Mirror is presented. Since the coordinate system of wavefronts after the Mirror reflection rotates about the optical axis along with the rotation angle, compensation or cancellation is absolutely necessary to fix the reconstructed 3D object. In this study, we address this problem by introducing an optical image rotator based on a right-angle prism that rotates synchronously with the Rotating Mirror. The optical and continuous compensation reduces the occurrence of duplicate images, which leads to the improvement of the quality of reconstructed images. The effect of the optical rotation compensation is experimentally verified and a demonstration of holographic 3D display with the optical rotation compensation is presented.
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holographic 3d display observable for multiple simultaneous viewers from all horizontal directions by using a time division method
Optics Letters, 2014Co-Authors: Yusuke Sando, Daisuke Barada, Toyohiko YatagaiAbstract:A holographic three-dimensional display system with a viewing angle of 360°, by using a high-speed digital microMirror device (DMD), has been proposed. The wavefront modulated by the DMD enters a Rotating Mirror tilted vertically downward. The synchronization of the Rotating Mirror and holograms displayed on the DMD allows for the reconstruction of a wavefront propagating in all horizontal directions. An optical experiment has been demonstrated in order to verify our proposed system. Binocular vision is realized from anywhere within the horizontal plane. Our display system enables simultaneous observation by multiple viewers at an extremely close range.
P Meystre - One of the best experts on this subject based on the ideXlab platform.
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entanglement of a laguerre gaussian cavity mode with a Rotating Mirror
Physical Review A, 2008Co-Authors: M Bhattacharya, Pierrelouis Giscard, P MeystreAbstract:It has previously been shown theoretically that the exchange of linear momentum between the light field in an optical cavity and a vibrating end Mirror can entangle the electromagnetic field with the vibrational motion of that Mirror. In this paper we consider the rotational analog of this situation and show that radiation torque can similarly entangle a Laguerre-Gaussian cavity mode with a Rotating end Mirror. We examine the Mirror-field entanglement as a function of ambient temperature, radiation detuning, and orbital angular momentum carried by the cavity mode.
