Abstract

A new and simple method for measuring the spot size of a laser beam is presented. In this method, the spot of a laser beam is scanned transversely across a straight boundary, and the intensity profile of the boundary-diffraction wave is observed. This intensity profile makes it possible to measure the spot size. The spot size of a He–Ne laser beam (wavelength 633 nm) has been measured to be 8.3 μm by using a Si3N4 straight pattern; this value is compared with 8.9 μm obtained by the knife-edge method.

© 1987 Optical Society of America

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References

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1984 (2)

1983 (1)

1981 (1)

1979 (1)

L. D. Dickson, Opt. Eng. 18, 70 (1979).

1978 (1)

1977 (1)

1976 (1)

A. Yoshida, T. Asakura, Opt. Laser Technol. 8, 273 (1976).
[CrossRef]

1975 (2)

1974 (1)

1972 (1)

D. R. Skinner, R. E. Whitcher, J. Phys. E 5, 237 (1972).
[CrossRef]

1971 (1)

Asakura, T.

A. Yoshida, T. Asakura, Opt. Laser Technol. 8, 273 (1976).
[CrossRef]

Belanger, P.-A.

Cohen, D. K.

Couture, M.

Davidovits, P.

Dickson, L. D.

L. D. Dickson, Opt. Eng. 18, 70 (1979).

Egger, M. D.

Firester, A. H.

Heller, M. E.

Lit, J. W. Y.

Little, B.

Luecke, F. S.

MaCally, R. L.

Otis, G.

Schneider, M. B.

Shayler, P. J.

Sheng, P.

Skinner, D. R.

D. R. Skinner, R. E. Whitcher, J. Phys. E 5, 237 (1972).
[CrossRef]

Suzaki, Y.

Tachibana, A.

Webb, W. W.

Whitcher, R. E.

D. R. Skinner, R. E. Whitcher, J. Phys. E 5, 237 (1972).
[CrossRef]

Yoshida, A.

A. Yoshida, T. Asakura, Opt. Laser Technol. 8, 273 (1976).
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

Experimental setup for measuring laser-beam spot size using a BDW.

Fig. 2
Fig. 2

(a) Observed intensity profile of the BDW: abscissa, 20 msec/division; ordinate, 50 mV/division. (b) Cross section of the straight pattern.

Fig. 3
Fig. 3

Observed total power profile of a transmitted laser beam. The laser beam is interrupted by a knife-edge, and the transmitted laser beam is detected by a solar cell. Abscissa, 10 msec/division; ordinate, 50 mV/division.

Equations (2)

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U K ( P ) = U B ( P ) + U 0 ( P ) ,
ω = 0.7803 d ,

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