Abstract

A novel two-wavelength interferometer is demonstrated that uses a tunable two-color laser-diode array as the light source. The synthetic wavelength can be easily tuned from 2 to 0.043 mm by variation of the spectral separation between the two wavelengths of the laser output. By using the second-order correlation technique we can directly retrieve the phase change at the synthetic wavelength with no need for sophisticated electronic signal processing.

© 1995 Optical Society of America

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References

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1994 (1)

C.-L. Wang, C.-L. Pan, Appl. Phys. Lett. 64, 3089 (1994).
[CrossRef]

1993 (2)

1991 (1)

1988 (1)

1985 (1)

1984 (1)

1977 (1)

Cheng, Y.-Y.

Dandliker, R.

de Groot, P.

Deck, L.

Demarest, F.

Fercher, A. F.

Hu, H. Z.

Ishii, Y.

Meystre, R.

R. Meystre, M. Sargent, Elements of Quantum Optics (Springer-Verlag, Berlin, 1990), pp. 19–13.

Onodera, R.

Pan, C.-L.

C.-L. Wang, C.-L. Pan, Appl. Phys. Lett. 64, 3089 (1994).
[CrossRef]

Prongue, D.

Sargent, M.

R. Meystre, M. Sargent, Elements of Quantum Optics (Springer-Verlag, Berlin, 1990), pp. 19–13.

Thalmann, R.

Tilford, C. R.

Vry, U.

Wang, C.-L.

C.-L. Wang, C.-L. Pan, Appl. Phys. Lett. 64, 3089 (1994).
[CrossRef]

Wyant, J. C.

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Figures (4)

Fig. 1
Fig. 1

Schematic of the two-wavelength second-order correlation interferometer. BS, beam splitter; PMT, photomultiplier tube; HR, highly reflective; AR, antireflective. The inset shows the configuration of the TWLDA.

Fig. 2
Fig. 2

Laser output spectra at the maximum and minimum spectral separation for Δλ = 0.32 nm (solid curve) and Δλ = 17 nm (dashed curve).

Fig. 3
Fig. 3

Measured distance as a function of the actual displacement. The synthetic wavelength is 0.112 mm.

Fig. 4
Fig. 4

Measured distance as a function of the actual displacement. The synthetic wavelength is 2 mm.

Equations (3)

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E 1 ( r 1 ) 2 + E 2 ( r 2 ) 2 + 2 Re [ E 1 ( r 1 ) E 2 ( r 2 ) * ] ,
I ( L ) = 2 I 0 + 2 I 0 cos ( 2 π L / Λ ) cos ( 2 π L / Γ ) ,
G ( 2 ) ( L ) = ( I 1 + I 2 ) 2 + 2 I 1 I 2 cos ( 2 π L / Λ ) ,

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