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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 4 — Feb. 16, 2009
  • pp: 2686–2695

Synthesized femtosecond laser pulse source for two-wavelength contouring with simultaneously recorded digital holograms

Thomas Hansel, Günter Steinmeyer, Ruediger Grunwald, Claas Falldorf, Jens Bonitz, Christian Kaufmann, Volker Kebbel, and Uwe Griebner  »View Author Affiliations

Optics Express, Vol. 17, Issue 4, pp. 2686-2695 (2009)

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A dual-wavelength femtosecond laser pulse source and its application for digital holographic single-shot contouring are presented. The synthesized laser source combines sub-picosecond time scales with a wide reconstruction range. A center wavelength distance of the two separated pulses of only 15 nm with a high contrast was demonstrated by spectral shaping of the 50 nm broad seed spectrum centered at 800 nm. Owing to the resulting synthetic wavelength, the scan depth range without phase ambiguity is extended to the 100-μm-range. Single-shot dual-wavelength imaging is achieved by using two CMOS cameras in a Twyman-Green interferometer, which is extended by a polarization encoding sequence to separate the holograms. The principle of the method is revealed, and experimental results concerning a single axis scanner mirror operating at a resonance frequency of 0.5 kHz are presented. Within the synthetic wavelength, the phase difference information of the object was unambiguously retrieved and the 3D-shape calculated. To the best of our knowledge, this is the first time that single-shot two-wavelength contouring on a sub-ps time scale is reported.

© 2009 Optical Society of America

OCIS Codes
(090.2880) Holography : Holographic interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(090.1995) Holography : Digital holography

ToC Category:

Original Manuscript: November 24, 2008
Revised Manuscript: January 16, 2009
Manuscript Accepted: January 25, 2009
Published: February 10, 2009

Thomas Hansel, Günter Steinmeyer, Ruediger Grunwald, Claas Falldorf, Jens Bonitz, Christian Kaufmann, Volker Kebbel, and Uwe Griebner, "Synthesized femtosecond laser pulse source for two-wavelength contouring with simultaneously recorded digital holograms," Opt. Express 17, 2686-2695 (2009)

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