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Article Dans Une Revue Opt.express Année : 2018

Multicascade-linked synthetic wavelength digital holography using an optical-comb-referenced frequency synthesizer

Masatomo Yamagiwa
  • Fonction : Auteur
Takeo Minamikawa
  • Fonction : Auteur
Takayuki Ogawa
  • Fonction : Auteur
Yusuke Kawahito
  • Fonction : Auteur
Ryo Oe
  • Fonction : Auteur
Kyuki Shibuya
  • Fonction : Auteur
Takahiko Mizuno
  • Fonction : Auteur
Yasuhiro Mizutani
  • Fonction : Auteur
Tetsuo Iwata
  • Fonction : Auteur
Hirotsugu Yamamoto
  • Fonction : Auteur
Kaoru Minoshima
  • Fonction : Auteur
Takeshi Yasui
  • Fonction : Auteur

Résumé

Digital holography (DH) is a promising method for non-contact surface topography because the reconstructed phase image can visualize the nanometer unevenness in a sample. However, the axial range of this method is limited to the range of the optical wavelength due to the phase wrapping ambiguity. Although the use of two different wavelengths of light and the resulting synthetic wavelength, i.e., synthetic wavelength DH, can expand the axial range up to several hundreds of millimeters, its axial precision does not reach sub-micrometer. In this article, we constructed a tunable external cavity laser diode phase-locked to an optical frequency comb, namely, an optical-comb-referenced frequency synthesizer, enabling us to generate multiple synthetic wavelengths within the range of 32 µm to 1.20 m. A multiple cascade link of the phase images among an optical wavelength ( = 1.520 µm) and 5 different synthetic wavelengths ( = 32.39 µm, 99.98 µm, 400.0 µm, 1003 µm, and 4021 µm) enables the shape measurement of a reflective millimeter-sized stepped surface with the axial resolution of 34 nm. The axial dynamic range, defined as the ratio of the axial range ( = 2.0 mm) to the axial resolution ( = 34 nm), achieves 5.9 × 105, which is larger than that of previous synthetic wavelength DH. Such a wide axial dynamic range capability will further expand the application field of DH for large objects with meter dimensions.
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Dates et versions

hal-01871631 , version 1 (05-10-2018)

Identifiants

Citer

Masatomo Yamagiwa, Takeo Minamikawa, Clément Trovato, Takayuki Ogawa, Dahi Ghareab Abdelsalam Ibrahim, et al.. Multicascade-linked synthetic wavelength digital holography using an optical-comb-referenced frequency synthesizer. Opt.express, 2018, 26 (20), pp.26292-26306. ⟨10.1364/OE.26.026292⟩. ⟨hal-01871631⟩

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