Tunable laser-diode digital holographic interferometry without measuring wavelength differences

Yukihiro Ishii; Kazuki Yoshida

doi:10.1117/12.871591

13 September 2010 Tunable laser-diode digital holographic interferometry without measuring wavelength differences

Yukihiro Ishii, Kazuki Yoshida

Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73870P (2010) https://doi.org/10.1117/12.871591
Event: Speckle 2010, 2010, Florianapolis, Brazil

Abstract

Multiple-wavelength holographic interferometry is an effective technique to generate a contour map of a diffusely reflecting object surface in the speckle field. A synthetic wavelength can be well generated by changing the current of laser diodes. A small synthetic wavelength needs a wide tunable external-cavity laser diode. A step object profile with discontinuous structure can be measured by using a synthetic wavelength to be sufficiently large that is derived from a known step height measured by vernier calipers but not wavelength measurements. The tunable laser-diode holographic interferometry is verified by experimental results.

Citation Download Citation

Yukihiro Ishii and Kazuki Yoshida "Tunable laser-diode digital holographic interferometry without measuring wavelength differences", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73870P (13 September 2010); https://doi.org/10.1117/12.871591

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