Optical interferometer system for shape monitoring of large high-aperture mirrors using the null method

2013 ◽  
Vol 13 (11) ◽  
Author(s):  
Natalia Graf ◽  
Daniil Puryaev
Keyword(s):  
Optical Interferometer ◽  
Shape Monitoring

Modeling of a Surface Plasmon Polariton Interferometer

2003 ◽  
Vol 797 ◽  
Author(s):  
Victor Coello ◽  
Thomas Søndergaard ◽  
Sergey I. Bozhevolnyi
Keyword(s):  
Experimental Data ◽  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Beam Splitter ◽  
Optical Interferometer ◽  
Plasmon Polariton ◽  
Plasmon Polaritons ◽  
Calculated Intensity ◽  
Good Agreement ◽  
Dipolar Model

ABSTRACTWe model the operation of a micro-optical interferometer for surface plasmon polaritons (SPPs) that comprises an SPP beam-splitter formed by equivalent scatterers lined up and equally spaced. The numerical calculations are carried out by using a vector dipolar model for multiple SPP scattering. The SPP beam-splitter is simulated for different angles of the incident SPP beam, radii of the particles, and inter-particle distances in order to find a suitable configuration for realization of a 3dB SPP beam-splitter. The results obtained are in good agreement with experimental data available in the literature. The feasibility of fabricating an interferometer is thereby corroborated and the calculated intensity maps are found rather similar to those experimentally reported.

scholarly journals Analysis of Embedded Optical Interferometry in Transparent Elastic Grating for Optical Detection of Ultrasonic Waves

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2787
Author(s):  
Chayanisa Sukkasem ◽  
Suvicha Sasivimolkul ◽  
Phitsini Suvarnaphaet ◽  
Suejit Pechprasarn
Keyword(s):  
Thin Film ◽  
Grating Period ◽  
Ultrasonic Waves ◽  
Optical Interferometer ◽  
Ultrasonic Detection ◽  
Grating Pattern ◽  
Flexible Material ◽  
Resonant Modes ◽  
Elastic Film ◽  
Fabry Perot

In this paper, we propose a theoretical framework to explain how the transparent elastic grating structure can be employed to enhance the mechanical and optical properties for ultrasonic detection. Incident ultrasonic waves can compress the flexible material, where the change in thickness of the elastic film can be measured through an optical interferometer. Herein, the polydimethylsiloxane (PDMS) was employed in the design of a thin film grating pattern. The PDMS grating with the grating period shorter than the ultrasound wavelength allowed the ultrasound to be coupled into surface acoustic wave (SAW) mode. The grating gaps provided spaces for the PDMS grating to be compressed when the ultrasound illuminated on it. This grating pattern can provide an embedded thin film based optical interferometer through Fabry–Perot resonant modes. Several optical thin film-based technologies for ultrasonic detection were compared. The proposed elastic grating gave rise to higher sensitivity to ultrasonic detection than a surface plasmon resonance-based sensor, a uniform PDMS thin film, a PDMS sensor with shearing interference, and a conventional Fabry–Perot-based sensor. The PDMS grating achieved the enhancement of sensitivity up to 1.3 × 10−5 Pa−1 and figure of merit of 1.4 × 10−5 Pa−1 which were higher than those of conventional Fabry–Perot structure by 7 times and 4 times, respectively.

scholarly journals All-optical attosecond time domain interferometry

2020 ◽  
Author(s):  
Zhen Yang ◽  
Wei Cao ◽  
Yunlong Mo ◽  
Huiyao Xu ◽  
Kang Mi ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Time Domain ◽  
Optical Pulse ◽  
Precision Measurements ◽  
Optical Interferometer ◽  
Transition Dipole ◽  
Interferometric Technique ◽  
All Optical ◽  
Energy Domain ◽  
Time And Energy

Abstract Interferometry, a key technique in modern precision measurements, has been used for length measurement in engineering metrology and astronomy. An analogous time-domain interferometric technique would represent a significant complement to spatial domain applications and require the manipulation of interference on extreme time and energy scales. Here, we report an all-optical interferometer using laser-driven high order harmonics as attosecond temporal slits. By controlling the phase of the temporal slits with an external field, a time domain interferometer that preserves attosecond temporal and hundreds of meV energy resolution is implemented. We apply this exceptional temporal resolution to reconstruct the waveform of an arbitrarily polarized optical pulse, and utilize the provided energy resolution to interrogate the abnormal character of the transition dipole near the Cooper minimum in argon. This novel attosecond interferometry paves the way for high precision measurements in the time energy domain using all-optical approaches.

Phase shift in a rotating neutron or optical interferometer

1979 ◽  
Vol 20 (8) ◽  
pp. 1846-1848 ◽  
Author(s):  
Max Dresden ◽  
Chen Ning Yang
Keyword(s):  
Phase Shift ◽  
Optical Interferometer

Proposal of Compact Optical System Using Planar Lightwave Circuit for Precision Measurement Based on Levitation Mass Method

2010 ◽  
Vol 36 ◽  
pp. 329-336
Author(s):  
Koichi Maru ◽  
Yusaku Fujii
Keyword(s):  
Optical System ◽  
Precision Measurement ◽  
Optical Interferometer ◽  
Planar Surface ◽  
Semiconductor Substrate ◽  
Optical Elements ◽  
Planar Lightwave Circuit ◽  
Planar Lightwave

A method for reducing the size and cost of optical system for precision measurement based on the Levitation Mass Method (LMM) is proposed. In the LMM, a mass levitated using a pneumatic linear bearing with sufficiently small friction is made to collide with the object being tested. The velocity and acceleration of the mass are measured using a compact optical interferometer. The size of the optical system can be drastically reduced by using a planar lightwave circuit (PLC), in which several optical elements are arranged on a planar surface of a silica or semiconductor substrate. Several applications of the PLC to precision measurement will be discussed.

Volume measurements of28Si-enriched spheres using an improved optical interferometer for the determination of the Avogadro constant

Metrologia ◽  
2017 ◽  
Vol 54 (2) ◽  
pp. 193-203 ◽  
Author(s):  
Naoki Kuramoto ◽  
Yasushi Azuma ◽  
Hajime Inaba ◽  
Kenichi Fujii
Keyword(s):  
Optical Interferometer ◽  
Avogadro Constant ◽  
Volume Measurements
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