Multiple-wavelength digital holographic interferometry using tunable laser diodes
Here we present multiple-wavelength digital holographic interferometry with a wide measurement range using laser diodes. Small wavelength differences can be easily realized by the wavelength tuning of laser diodes with injection current controls. A contour map of an object with a wide measurement range and a high sensitivity is demonstrated by combining a few contour maps with several measurement sensitivities. Synthetic wavelengths are calibrated using a known height difference. This alleviates the need to have high precise knowledge of the recording wavelengths. The synthetic wavelengths ranged from {approx}3 mm for high measurement sensitivity to {approx}4 cm for wide measurement range. An rms error of {approx}35 {mu}m for a {approx}1 cm height measurement is shown. The measured profile of holographic interferometry agrees with a standard stylus instrument.
- OSTI ID:
- 21120718
- Journal Information:
- Applied Optics, Journal Name: Applied Optics Journal Issue: 12 Vol. 47; ISSN 0003-6935; ISSN APOPAI
- Country of Publication:
- United States
- Language:
- English
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