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Proceedings Paper

Optical frequency comb profilometry using a single-pixel camera
Author(s): Yoshio Hayasaki; Quang Duc Pham
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Paper Abstract

We demonstrate an optical profilometer composed of an ultra-stabilized mode-locked femtosecond laser, a single pixel camera, and an optoelectronic interferometer. The combination of an optical frequency comb generated by the femtosecond laser and the optoelectronic interference in radio frequecny range enables us to measure an object with a large depth much more than a wavelength of light with a wide dynamic range giving no 2π phase ambiguity. The wide dynamic range is achieved by high stability of the optical frequency comb and easy selection of the frequency. The single pixel camera is used for twodimensional imaging without a mechanical scanning. It is performed by spatial light modulation of an object beam, the coherent summation of the spatially-modulated object beam with a single photo detector, and an inverse matrix calculation. We selected two approaches to reduce the number of measurements. One was the compressive sensing that well reduced the number when an object is sparse. The other was the reversal signal generation method that reduced the number to one-half of the sampling points for any object. We demonstrated the surface profilometry for an object with the depth of several centimeters.

Paper Details

Date Published: 1 May 2014
PDF: 8 pages
Proc. SPIE 9132, Optical Micro- and Nanometrology V, 913202 (1 May 2014); doi: 10.1117/12.2051953
Show Author Affiliations
Yoshio Hayasaki, Utsunomiya Univ. (Japan)
Quang Duc Pham, Utsunomiya Univ. (Japan)


Published in SPIE Proceedings Vol. 9132:
Optical Micro- and Nanometrology V
Christophe Gorecki; Anand Krishna Asundi; Wolfgang Osten, Editor(s)

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