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Displacement Measurement of DAST Crystal by Speckle Photography in Crystal Oscillator.

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Title: Displacement Measurement of DAST Crystal by Speckle Photography in Crystal Oscillator.
Authors: K., SUGANDHI1, R., BALAMURUGAN1 balamurugan.r.sci@kct.ac.in
Source: Nonlinear Optics, Quantum Optics: Concepts in Modern Optics. 2025, Vol. 61 Issue 3/4, p243-257. 15p.
Subjects: X-ray powder diffraction, Crystal oscillators, Speckle interference, Harmonic generation, Displacement (Mechanics)
Abstract: Synthesis and the growth of 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystals by a seed rotation technique in methanol solution is described. DAST crystals have a large surface area and perform well in simple harmonic and THz generation through their peculiar characterisation. The structure and crystallinity are confirmed by the powder X-ray diffraction method. SEM analysis helps with morphological study. In the experimental setup, the optical design for displacement estimation and the crystal oscillator are simplified for convenience. A low-power coherent red laser of 650 nm by a good resolution CCD camera is employed. Speckle photography is a non-destructive method to assess the in-plane displacement on DAST crystal surfaces in the complex MEMS application field. The displacement evaluation is carried out with the help of Young’s fringes observed in the speckle pattern. The counted fringes in terms of the wavelength of the laser contribute to the displacement in the range of microns. The intensity information is obtained from the surface profile plot. [ABSTRACT FROM AUTHOR]
Copyright of Nonlinear Optics, Quantum Optics: Concepts in Modern Optics is the property of Old City Publishing, Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Displacement Measurement of DAST Crystal by Speckle Photography in Crystal Oscillator.
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  Data: <searchLink fieldCode="AR" term="%22K%2E%2C+SUGANDHI%22">K., SUGANDHI</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22R%2E%2C+BALAMURUGAN%22">R., BALAMURUGAN</searchLink><relatesTo>1</relatesTo><i> balamurugan.r.sci@kct.ac.in</i>
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  Data: <searchLink fieldCode="JN" term="%22Nonlinear+Optics%2C+Quantum+Optics%3A+Concepts+in+Modern+Optics%22">Nonlinear Optics, Quantum Optics: Concepts in Modern Optics</searchLink>. 2025, Vol. 61 Issue 3/4, p243-257. 15p.
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  Data: <searchLink fieldCode="DE" term="%22X-ray+powder+diffraction%22">X-ray powder diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+oscillators%22">Crystal oscillators</searchLink><br /><searchLink fieldCode="DE" term="%22Speckle+interference%22">Speckle interference</searchLink><br /><searchLink fieldCode="DE" term="%22Harmonic+generation%22">Harmonic generation</searchLink><br /><searchLink fieldCode="DE" term="%22Displacement+%28Mechanics%29%22">Displacement (Mechanics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Synthesis and the growth of 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystals by a seed rotation technique in methanol solution is described. DAST crystals have a large surface area and perform well in simple harmonic and THz generation through their peculiar characterisation. The structure and crystallinity are confirmed by the powder X-ray diffraction method. SEM analysis helps with morphological study. In the experimental setup, the optical design for displacement estimation and the crystal oscillator are simplified for convenience. A low-power coherent red laser of 650 nm by a good resolution CCD camera is employed. Speckle photography is a non-destructive method to assess the in-plane displacement on DAST crystal surfaces in the complex MEMS application field. The displacement evaluation is carried out with the help of Young’s fringes observed in the speckle pattern. The counted fringes in terms of the wavelength of the laser contribute to the displacement in the range of microns. The intensity information is obtained from the surface profile plot. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nonlinear Optics, Quantum Optics: Concepts in Modern Optics is the property of Old City Publishing, Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 243
    Subjects:
      – SubjectFull: X-ray powder diffraction
        Type: general
      – SubjectFull: Crystal oscillators
        Type: general
      – SubjectFull: Speckle interference
        Type: general
      – SubjectFull: Harmonic generation
        Type: general
      – SubjectFull: Displacement (Mechanics)
        Type: general
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      – TitleFull: Displacement Measurement of DAST Crystal by Speckle Photography in Crystal Oscillator.
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            NameFull: K., SUGANDHI
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            NameFull: R., BALAMURUGAN
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            – D: 01
              M: 04
              Text: 2025
              Type: published
              Y: 2025
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              Value: 61
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              Value: 3/4
          Titles:
            – TitleFull: Nonlinear Optics, Quantum Optics: Concepts in Modern Optics
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