Abstract

It is shown that selective extraction of an image from multiple interferograms can be performed by electronic processing of interference beat signals. The frequencies of beat signals generated by ramping the laser-diode (LD) current are proportional to the optical path differences between the reference and the object arms in a LD interferometer. A beat signal with a frequency corresponding to an object-assigned interferometric arm can be extracted by electronic tuning. An interference pattern detected by a dissector camera is sampled in synchronism with the beat signal, which permits two-dimensional selective imaging.

© 1995 Optical Society of America

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References

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  1. Y. Ishii, Opt. Lasers Eng. 14, 293 (1991).
    [Crossref]
  2. K. Hotate, T. Okugawa, J. Lightwave Technol. 12, 1247 (1994).
    [Crossref]
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    [Crossref]
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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]

1994 (3)

1992 (2)

1991 (1)

Y. Ishii, Opt. Lasers Eng. 14, 293 (1991).
[Crossref]

1985 (1)

D. Uttam, B. Culshaw, J. Lightwave Technol. LT-3, 971 (1985).
[Crossref]

Anndo, N.

Culshaw, B.

D. Uttam, B. Culshaw, J. Lightwave Technol. LT-3, 971 (1985).
[Crossref]

Funaba, T.

Hotate, K.

K. Hotate, T. Okugawa, J. Lightwave Technol. 12, 1247 (1994).
[Crossref]

Ichimura, T.

Ishii, Y.

Y. Ishii, Opt. Lasers Eng. 14, 293 (1991).
[Crossref]

Kitoh, M.

Knutson, J. R.

Knüttel, A.

Marron, J. C.

Odagiri, Y.

Okugawa, T.

K. Hotate, T. Okugawa, J. Lightwave Technol. 12, 1247 (1994).
[Crossref]

Schmitt, J. M.

Schroeder, K. S.

Takeda, M.

Tan-no, N.

Uttam, D.

D. Uttam, B. Culshaw, J. Lightwave Technol. LT-3, 971 (1985).
[Crossref]

Appl. Opt. (1)

J. Lightwave Technol. (2)

K. Hotate, T. Okugawa, J. Lightwave Technol. 12, 1247 (1994).
[Crossref]

D. Uttam, B. Culshaw, J. Lightwave Technol. LT-3, 971 (1985).
[Crossref]

J. Opt. Soc. Am. A (1)

Opt. Lasers Eng. (1)

Y. Ishii, Opt. Lasers Eng. 14, 293 (1991).
[Crossref]

Opt. Lett. (2)

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Figures (5)

Fig. 1
Fig. 1

Schematic of the selective extraction of a beat signal by ramping LD current. PD, photodiode.

Fig. 2
Fig. 2

Serial-to-parallel conversion of interference signals with an image dissector camera for a selective imaging.

Fig. 3
Fig. 3

Experimental configuration of a LD interferometer used for selective imaging of the phase object. PBS’s, polarizing beam splitters; λ/4, quarter-wave plate; M’s, mirrors.

Fig. 4
Fig. 4

Experimental results of the selective interferometric imaging of the character B in (b) compared with the conventional imaging in (a).

Fig. 5
Fig. 5

Phase distribution obtained from the selective interferometric image in Fig. 4(b) by the Fourier-transform technique.

Equations (6)

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ω b i = ( l i / T c ) Δ ω ,
s ( x , y , t ) = A ( x , y ) + i = 1 N B i ( x , y ) cos [ ω b i t + ϕ i ( x , y ) ] ,
ξ i = ω b i / ( f s p ) ,
I ( x , y ) = A ( x , y ) + i = 1 N B i ( x , y ) cos [ ξ i x + ϕ i ( x , y ) ] .
I n ( x , y ) = B n ( x , y ) cos [ ξ n x + ϕ n ( x , y ) ] ,
Δ l res = l n / Q .

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