High-precision 3D surface topography measurement using high-stable multi-wavelength digital holography referenced by an optical frequency comb

High-stable, two-wavelength, digital holography referenced by an optical frequency comb is presented. The technique is demonstrated by using optical waves from an external cavity laser diode phase-locked to a mode-locked Er-doped fiber comb laser light. The mixed beat signal is stabilized at 30 MHz...

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Bibliographic Details
Published in:Optics letters 2018-04, Vol.43 (8), p.1758-1761
Main Authors: Abdelsalam Ibrahim, Dahi Ghareab, Yasui, Takeshi
Format: Article
Language:English
Subjects:
Continuous radiation
Doped fibers
External-cavity lasers
Fiber lasers
Holography
Optical frequency
Proportional integral derivative
Semiconductor lasers
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Summary:High-stable, two-wavelength, digital holography referenced by an optical frequency comb is presented. The technique is demonstrated by using optical waves from an external cavity laser diode phase-locked to a mode-locked Er-doped fiber comb laser light. The mixed beat signal is stabilized at 30 MHz by a sensitive proportional integral derivative controller. The tunable continuous-waves stabilized with frequency uncertainty of 5×10 are employed to investigate large stepped structures.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.001758