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Keywords = pentaprism

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10 pages, 1372 KiB  
Communication
Single-Element Dual-Interferometer for Precision Inertial Sensing: Sub-Picometer Structural Stability and Performance as a Reference for Laser Frequency Stabilization
by Victor Huarcaya, Miguel Dovale Álvarez, Kohei Yamamoto, Yichao Yang, Stefano Gozzo, Pablo Martínez Cano, Moritz Mehmet, Juan José Esteban Delgado, Jianjun Jia and Gerhard Heinzel
Sensors 2023, 23(24), 9758; https://doi.org/10.3390/s23249758 - 11 Dec 2023
Viewed by 1890
Abstract
Future GRACE-like geodesy missions could benefit from adopting accelerometer technology akin to that of the LISA Pathfinder, which employed laser interferometric readout at the sub-picometer level in addition to the conventional capacitive sensing, which is at best at the level of 100 pm. [...] Read more.
Future GRACE-like geodesy missions could benefit from adopting accelerometer technology akin to that of the LISA Pathfinder, which employed laser interferometric readout at the sub-picometer level in addition to the conventional capacitive sensing, which is at best at the level of 100 pm. Improving accelerometer performance holds great potential to enhance the scientific output of forthcoming missions, carrying invaluable implications for research in climate, water resource management, and disaster risk reduction. To reach sub-picometer displacement sensing precision in the millihertz range, laser interferometers rely on suppression of laser-frequency noise by several orders of magnitude. Many optical frequency stabilization methods are available with varying levels of complexity, size, and performance. In this paper, we describe the performance of a Mach–Zehnder interferometer based on a compact monolithic optic. The setup consists of a commercial fiber injector, a custom-designed pentaprism used to split and recombine the laser beam, and two photoreceivers placed at the complementary output ports of the interferometer. The structural stability of the prism is transferred to the laser frequency via amplification, integration, and feedback of the balanced-detection signal, achieving a fractional frequency instability better than 6 parts in 1013, corresponding to an interferometer pathlength stability better than 1pm/Hz. The prism was designed to host a second interferometer to interrogate the position of a test mass. This optical scheme has been dubbed “single-element dual-interferometer” or SEDI. Full article
(This article belongs to the Section Optical Sensors)
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11 pages, 7358 KiB  
Article
Photonics Scanning Pentaprism System for the Integrated Inspection of Large-Aperture Telescopes
by Qichang An, Hanfu Zhang, Kun Wang, Xinyue Liu and Hongwen Li
Sensors 2023, 23(15), 6650; https://doi.org/10.3390/s23156650 - 25 Jul 2023
Cited by 5 | Viewed by 1804
Abstract
To improve their spatial resolution and detection capabilities, future ground-based optical telescopes will have a size of 30 m, and the aperture of space telescopes will be increased to 10 m. Such large optical systems necessitate the development of large integrated testing equipment. [...] Read more.
To improve their spatial resolution and detection capabilities, future ground-based optical telescopes will have a size of 30 m, and the aperture of space telescopes will be increased to 10 m. Such large optical systems necessitate the development of large integrated testing equipment. In this study, spectrum and system alignment measurements and wavefront quality checking were performed using the sub-aperture detection method and a fiber-connected Photonics Scanning Pentaprism (PSP). First, the system was aligned using an optical truss, ensuring that the optical axis was properly positioned. Second, using a sub-aperture light beam though the entrance pupil, light spots were formed on the focal plane and transmitted to the spectrometer via fibers to obtain the corresponding spectral components. Then, by taking measurements at different system positions, a full-aperture spectrum response could be reached. Lastly, by photon-integrated interference on the focal plane, intensity interference fringes could be projected at the entrance pupil of the system. And the wavefront quality of the system could be verified by observing the fringe deformation. The measurement accuracy of the optical axis of the system is better than 2 mrad. The spectral measurement accuracy was better than 5%, and the wavefront measurement accuracy surpassed 0.1 wavelengths (1 wavelength = 633 nm). This study effectively enhanced the detection and in situ calibration capabilities of large telescope systems, ensuring that the performance requirements can be met in the design of future telescopes. Full article
(This article belongs to the Special Issue Advanced Applications of Fiber Optic Sensors)
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9 pages, 1775 KiB  
Article
Vortex Beam Encoded All-Optical Logic Gates Based on Nano-Ring Plasmonic Antennas
by Houquan Liu, Hongchang Deng, Shijie Deng, Chuanxin Teng, Ming Chen and Libo Yuan
Nanomaterials 2019, 9(12), 1649; https://doi.org/10.3390/nano9121649 - 20 Nov 2019
Cited by 10 | Viewed by 3499
Abstract
Vortex beam encoded all-optical logic gates are suggested to be very important in future information processing. However, within current logic devices, only a few are encoded by using vortex beams and, in these devices, some space optical elements with big footprints (mirror, dove [...] Read more.
Vortex beam encoded all-optical logic gates are suggested to be very important in future information processing. However, within current logic devices, only a few are encoded by using vortex beams and, in these devices, some space optical elements with big footprints (mirror, dove prism and pentaprism) are indispensable components, which is not conducive to device integration. In this paper, an integrated vortex beam encoded all-optical logic gate based on a nano-ring plasmonic antenna is proposed. In our scheme, by defining the two circular polarization states of the input vortex beams as the input logic states and the normalized intensity of the plasmonic field at the center of the nano-ring as the output logic states, OR and AND (NOR and NAND) logic gates are realized when two 1st (1st) order vortex beams are chosen as the two input signals; and a NOT logic gate is obtained when one 1st order vortex beam is chosen as the input signal. In addition, by defining the two linear polarization states (x and y polarization) of the input vortex beams as the two input logic states, an XNOR logic gate is realized when two 1st order vortex beams are chosen as the two input signals. Full article
(This article belongs to the Special Issue Advances in Photonic and Plasmonic Nanomaterials)
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8 pages, 1616 KiB  
Article
Large-Aperture Real-Time Compensated Collimating Wavefront Error Detection Method
by Xueliang Zhu, Dasen Wang, Fengming Nie, Bingcai Liu, Hongjun Wang and Ailing Tian
Appl. Sci. 2019, 9(11), 2370; https://doi.org/10.3390/app9112370 - 11 Jun 2019
Cited by 3 | Viewed by 2943
Abstract
This paper proposes a real-time compensated pentaprism scanning wavefront detection method to achieve real-time compensation for scanning errors occurring during prism movement along a guide rail. The method is based on existing pentaprism scanning wavefront detection technology and it is realized by applying [...] Read more.
This paper proposes a real-time compensated pentaprism scanning wavefront detection method to achieve real-time compensation for scanning errors occurring during prism movement along a guide rail. The method is based on existing pentaprism scanning wavefront detection technology and it is realized by applying self-collimation-based three-dimensional error compensation. Using theoretical and data analyses of a detection experiment, the reliability of the optimized pentaprism scanning detection method is verified, thus effectively ensuring the reasonable estimation of the interferometry surface measurement uncertainty. Full article
(This article belongs to the Section Applied Industrial Technologies)
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19 pages, 12514 KiB  
Article
A Geometric Error Measurement System for Linear Guideway Assembly and Calibration
by Tung-Hsien Hsieh, Po-Yu Chen, Wen-Yuh Jywe, Guan-Wu Chen and Ming-Shi Wang
Appl. Sci. 2019, 9(3), 574; https://doi.org/10.3390/app9030574 - 10 Feb 2019
Cited by 21 | Viewed by 5416
Abstract
Geometric errors, such as straightness, perpendicularity, and parallelism errors are determinant factors of both the accuracy and service life of a linear guideway. In this study, a multipurpose geometric error measurement system was mainly composed of a laser source and an in-lab-developed optical [...] Read more.
Geometric errors, such as straightness, perpendicularity, and parallelism errors are determinant factors of both the accuracy and service life of a linear guideway. In this study, a multipurpose geometric error measurement system was mainly composed of a laser source and an in-lab-developed optical module is proposed. Two adjustment methods were used for the in-lab-developed optical module to calibrate the altitude angle of the pentaprism: The first one is designed for ease of operation based on Michelson principle using a laser interferometer as the light receiver, and the second is aimed at high calibration repeatability based on the autocollimator principle using the quadrant detector (QD) to replace the light receiver. The result shows that the residual errors of the horizontal straightness and the vertical straightness are within ±1.3 µm and ±5.3 µm, respectively, when referred to as the commercial laser interferometer. Additionally, the residual errors of perpendicularity and parallelism are within ±1.2 µm and ±0.1 µm, respectively, when referred to as the granite reference blocks Full article
(This article belongs to the Special Issue Precision Dimensional Measurements)
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