The Experts below are selected from a list of 2043 Experts worldwide ranked by ideXlab platform

Ohkyung Kwon - One of the best experts on this subject based on the ideXlab platform.

  • constraints on scalar field dark matter from co located Michelson Interferometers
    arXiv: General Relativity and Quantum Cosmology, 2021
    Co-Authors: L Aiello, Craig J Hogan, Ohkyung Kwon, H Grote, J W Richardson, Sander M Vermeulen, Chris Stoughton
    Abstract:

    Low-mass (sub-eV) scalar field dark matter may induce apparent oscillations of fundamental constants, resulting in corresponding oscillations of the size and the index of refraction of solids. Laser Interferometers are highly sensitive to changes in the size and index of refraction of the main beamsplitter. Using cross-correlated data of the Fermilab Holometer instrument, which consists of twin co-located 40-m arm length power-recycled Interferometers, we investigate the possible existence of scalar field dark matter candidates in the mass range between 1.6$\cdot$10$^{-12}$ eV and 1.0$\cdot$10$^{-7}$ eV. We set new upper limits for the coupling parameters of scalar field dark matter, improving on limits from previous direct searches by up to three orders of magnitude.

  • constraints on scalar field dark matter from twin co located power recycled Michelson Interferometers
    arXiv: General Relativity and Quantum Cosmology, 2021
    Co-Authors: L Aiello, Craig J Hogan, Ohkyung Kwon, H Grote, J W Richardson, Sander M Vermeulen, Chris Stoughton
    Abstract:

    The origin and the physical properties of dark matter remain unknown to date and their discovery is one of the most challenging topics in contemporary physics. One possible, prominent option is scalar field dark matter. In particular, low-mass (sub-eV) scalar field dark matter may induce apparent oscillations of fundamental constants, resulting in corresponding oscillations of the size and the index of refraction of solids. Laser Interferometers are highly sensitive to changes in the size and index of refraction of the main beamsplitter. Using the data of the Fermilab Holometer instrument, which consists of twin co-located 40-m arm length power-recycled Interferometers built to test quantum gravity theories, we investigate the possible existence of scalar field dark matter candidates in the mass range between 4.1$\cdot$10$^{-9}$ eV and 10$^{-7}$ eV. We set new upper limits for the coupling parameters of scalar field dark matter, improving on limits from previous direct searches by up to one order of magnitude.

  • mhz gravitational wave constraints with decameter Michelson Interferometers
    Physical Review D, 2017
    Co-Authors: Aaron Chou, R Gustafson, Craig J Hogan, Brittany Kamai, Ohkyung Kwon, R K Lanza
    Abstract:

    A new detector, the Fermilab Holometer, consists of separate yet identical 39-meter Michelson Interferometers. Strain sensitivity achieved is better than $10^{-21} /{\sqrt{\rm{Hz}}}$ between 1 to 13 MHz from a 130-hr dataset. This measurement exceeds the sensitivity and frequency range made from previous high frequency gravitational wave experiments by many orders of magnitude. Constraints are placed on a stochastic background at 382 Hz resolution. The 3$\sigma$ upper limit on $\Omega_{\rm{GW}}$, the gravitational wave energy density normalized to the closure density, ranges from $5.6 \times 10^{12}$ at 1 MHz to $8.4 \times 10^{15}$ at 13 MHz. Another result from the same dataset is a search for nearby primordial black hole binaries (PBHB). There are no detectable monochromatic PBHBs in the mass range $0.83$ - $3.5 \times 10^{21}$g between the earth and the moon. Projections for a chirp search with the same dataset increases the mass range to $0.59 - 2.5 \times 10^{25}$g and distances out to Jupiter. This result presents a new method for placing limits on a poorly constrained mass range of primordial black holes. Additionally, solar system searches for PBHBs place limits on their contribution to the total dark matter fraction.

  • first measurements of high frequency cross spectra from a pair of large Michelson Interferometers
    Physical Review Letters, 2016
    Co-Authors: Aaron S Chou, R Gustafson, Craig J Hogan, Brittany Kamai, Ohkyung Kwon, R K Lanza
    Abstract:

    Measurements are reported of the cross-correlation of spectra of differential position signals from the Fermilab Holometer, a pair of colocated 39 m long, high power Michelson Interferometers with flat broadband frequency response in the MHz range. The instrument obtains sensitivity to high frequency correlated signals far exceeding any previous measurement in a broad frequency band extending beyond the 3.8 MHz inverse light-crossing time of the apparatus. The dominant but uncorrelated shot noise is averaged down over $2\ifmmode\times\else\texttimes\fi{}1{0}^{8}$ independent spectral measurements with 381 Hz frequency resolution to obtain $2.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}20}\mathrm{m}/\sqrt{\mathrm{Hz}}$ sensitivity to stationary signals. For signal bandwidths $\mathrm{\ensuremath{\Delta}}fg11\text{ }\text{ }\mathrm{kHz}$, the sensitivity to strain $h$ or shear power spectral density of classical or exotic origin surpasses a milestone ${\mathrm{PSD}}_{\ensuremath{\delta}h}l{t}_{p}$ where ${t}_{p}=5.39\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}44}/\mathrm{Hz}$ is the Planck time.

Craig J Hogan - One of the best experts on this subject based on the ideXlab platform.

  • constraints on scalar field dark matter from co located Michelson Interferometers
    arXiv: General Relativity and Quantum Cosmology, 2021
    Co-Authors: L Aiello, Craig J Hogan, Ohkyung Kwon, H Grote, J W Richardson, Sander M Vermeulen, Chris Stoughton
    Abstract:

    Low-mass (sub-eV) scalar field dark matter may induce apparent oscillations of fundamental constants, resulting in corresponding oscillations of the size and the index of refraction of solids. Laser Interferometers are highly sensitive to changes in the size and index of refraction of the main beamsplitter. Using cross-correlated data of the Fermilab Holometer instrument, which consists of twin co-located 40-m arm length power-recycled Interferometers, we investigate the possible existence of scalar field dark matter candidates in the mass range between 1.6$\cdot$10$^{-12}$ eV and 1.0$\cdot$10$^{-7}$ eV. We set new upper limits for the coupling parameters of scalar field dark matter, improving on limits from previous direct searches by up to three orders of magnitude.

  • constraints on scalar field dark matter from twin co located power recycled Michelson Interferometers
    arXiv: General Relativity and Quantum Cosmology, 2021
    Co-Authors: L Aiello, Craig J Hogan, Ohkyung Kwon, H Grote, J W Richardson, Sander M Vermeulen, Chris Stoughton
    Abstract:

    The origin and the physical properties of dark matter remain unknown to date and their discovery is one of the most challenging topics in contemporary physics. One possible, prominent option is scalar field dark matter. In particular, low-mass (sub-eV) scalar field dark matter may induce apparent oscillations of fundamental constants, resulting in corresponding oscillations of the size and the index of refraction of solids. Laser Interferometers are highly sensitive to changes in the size and index of refraction of the main beamsplitter. Using the data of the Fermilab Holometer instrument, which consists of twin co-located 40-m arm length power-recycled Interferometers built to test quantum gravity theories, we investigate the possible existence of scalar field dark matter candidates in the mass range between 4.1$\cdot$10$^{-9}$ eV and 10$^{-7}$ eV. We set new upper limits for the coupling parameters of scalar field dark matter, improving on limits from previous direct searches by up to one order of magnitude.

  • mhz gravitational wave constraints with decameter Michelson Interferometers
    Physical Review D, 2017
    Co-Authors: Aaron Chou, R Gustafson, Craig J Hogan, Brittany Kamai, Ohkyung Kwon, R K Lanza
    Abstract:

    A new detector, the Fermilab Holometer, consists of separate yet identical 39-meter Michelson Interferometers. Strain sensitivity achieved is better than $10^{-21} /{\sqrt{\rm{Hz}}}$ between 1 to 13 MHz from a 130-hr dataset. This measurement exceeds the sensitivity and frequency range made from previous high frequency gravitational wave experiments by many orders of magnitude. Constraints are placed on a stochastic background at 382 Hz resolution. The 3$\sigma$ upper limit on $\Omega_{\rm{GW}}$, the gravitational wave energy density normalized to the closure density, ranges from $5.6 \times 10^{12}$ at 1 MHz to $8.4 \times 10^{15}$ at 13 MHz. Another result from the same dataset is a search for nearby primordial black hole binaries (PBHB). There are no detectable monochromatic PBHBs in the mass range $0.83$ - $3.5 \times 10^{21}$g between the earth and the moon. Projections for a chirp search with the same dataset increases the mass range to $0.59 - 2.5 \times 10^{25}$g and distances out to Jupiter. This result presents a new method for placing limits on a poorly constrained mass range of primordial black holes. Additionally, solar system searches for PBHBs place limits on their contribution to the total dark matter fraction.

  • first measurements of high frequency cross spectra from a pair of large Michelson Interferometers
    Physical Review Letters, 2016
    Co-Authors: Aaron S Chou, R Gustafson, Craig J Hogan, Brittany Kamai, Ohkyung Kwon, R K Lanza
    Abstract:

    Measurements are reported of the cross-correlation of spectra of differential position signals from the Fermilab Holometer, a pair of colocated 39 m long, high power Michelson Interferometers with flat broadband frequency response in the MHz range. The instrument obtains sensitivity to high frequency correlated signals far exceeding any previous measurement in a broad frequency band extending beyond the 3.8 MHz inverse light-crossing time of the apparatus. The dominant but uncorrelated shot noise is averaged down over $2\ifmmode\times\else\texttimes\fi{}1{0}^{8}$ independent spectral measurements with 381 Hz frequency resolution to obtain $2.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}20}\mathrm{m}/\sqrt{\mathrm{Hz}}$ sensitivity to stationary signals. For signal bandwidths $\mathrm{\ensuremath{\Delta}}fg11\text{ }\text{ }\mathrm{kHz}$, the sensitivity to strain $h$ or shear power spectral density of classical or exotic origin surpasses a milestone ${\mathrm{PSD}}_{\ensuremath{\delta}h}l{t}_{p}$ where ${t}_{p}=5.39\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}44}/\mathrm{Hz}$ is the Planck time.

Minmin Zheng - One of the best experts on this subject based on the ideXlab platform.

  • new data processing technique for measurement of metallic foil thickness with differential white light interferometry
    Optics and Lasers in Engineering, 2007
    Co-Authors: Huimin Yan, Yongjun Nie, Xiuda Zhang, Minmin Zheng
    Abstract:

    Abstract The thickness of metallic foil was measured by differential white-light interferometry (DWLI). Two tandem Michelson Interferometers (MI), in which the reflective surfaces measured are the surfaces of the metallic foil, were used as a basic interferometry system to obtain interference fringes on a spectrometer. Therefore, the interference fringes depend only on the path differences caused by the thickness of the metallic foil. The interference fringes were analyzed using a modified extremum method based on the least root-mean-square (RMS) deviation. Experimental results for thickness measurements are presented. Measurement time is only 100 ms or less for a thickness of 1–80 μm.

Huimin Yan - One of the best experts on this subject based on the ideXlab platform.

  • new data processing technique for measurement of metallic foil thickness with differential white light interferometry
    Optics and Lasers in Engineering, 2007
    Co-Authors: Huimin Yan, Yongjun Nie, Xiuda Zhang, Minmin Zheng
    Abstract:

    Abstract The thickness of metallic foil was measured by differential white-light interferometry (DWLI). Two tandem Michelson Interferometers (MI), in which the reflective surfaces measured are the surfaces of the metallic foil, were used as a basic interferometry system to obtain interference fringes on a spectrometer. Therefore, the interference fringes depend only on the path differences caused by the thickness of the metallic foil. The interference fringes were analyzed using a modified extremum method based on the least root-mean-square (RMS) deviation. Experimental results for thickness measurements are presented. Measurement time is only 100 ms or less for a thickness of 1–80 μm.

  • ultra thin metallic foil thickness measurement system using fiber optic low coherence interferometry
    Proceedings of SPIE, 2005
    Co-Authors: Huimin Yan, Yongjun Nie, Xiuda Zhang
    Abstract:

    The thickness of metallic foil is measured by differential low-coherence interferometry. Two tandem Michelson Interferometers (MI), of which reflective surfaces measured are the corresponding surfaces of metallic foil, are used as basic interferometric system to obtain interference fringes on a spectrometer. Therefore, the interference fringes only depend on the path differences due to the thickness of metallic foil. The interference fringes are analyzed with a modified extremum method based on the least root mean square (RMS) deviation. The experimental results on thickness measurement are presented.

  • noncontact thickness measurement of metal foil by means of differential white light interferometry
    Optical Design and Testing II, 2005
    Co-Authors: Huimin Yan, Xiaoqiang Yao, Yongjun Nie, Baixuan Shi
    Abstract:

    A new differential white light interference technique for the thickness measurement of metal foil is presented. In this work, the differential white light system consists of two Michelson Interferometers (MI) in tandem, of which reflective surfaces measured are corresponding surfaces of metal foil. Therefore, the measured result only relates to the thickness but not to the position of metal foil. The method is non-contact, non-destructive, has advantage of high accuracy, fast detection and compact structure. Theoretical analysis and preliminary experimental results have shown that the technique can measure the thickness of foil in the range of 1 μm to 80 μm with satisfactory accuracy and repeatability.

S J Waldman - One of the best experts on this subject based on the ideXlab platform.

  • impact of upconverted scattered light on advanced interferometric gravitational wave detectors
    Optics Express, 2012
    Co-Authors: P Fritschel, D J Ottaway, S J Waldman
    Abstract:

    Second generation gravitational wave detectors are being installed in a number of locations globally. These long-baseline, Michelson Interferometers increase the sensitivity between 10 and 40 Hz by many orders of magnitude compared with first generation instruments. Control of non-linear noise coupling from scattered light fields is critical to achieve low frequency performance. In this paper we investigate the requirements on the attenuation of scattered light using a novel time-domain analysis and two years of seismic data from the LIGO Livingston Observatory.