Abstract

Radiation characteristics of multimode fibers with enlarged tapers were investigated on a number of samples obtained by varying the fiber drawing speed with a given law corresponding to a prefixed taper profile. The characterization of the fibers was made by near- and far-field intensity pattern measurements as well as by measuring the losses introduced by the taper. With a suitable choice of parameters the taper constitutes a reasonable low-loss component useful, for example, for either efficient coupling to large-spot high-power density sources or connecting fibers of different sizes. Conversely at the exit of the fiber the taper can be used for beam shaping which is of interest for mechanical or surgical applications.

© 1982 Optical Society of America

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References

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  1. T. Ozeki, T. Ito, T. Tamura, Appl. Phys. Lett. 26, 386 (1975).
    [Crossref]
  2. T. Ozeki, B. S. Kawasaki, Appl. Phys. Lett. 28, 528 (1976).
    [Crossref]
  3. C. T. Chang, D. C. Auth, J. Opt. Soc. Am. 68, 1191 (1978).
    [Crossref]
  4. H. Kuwahara, H. Furuta, Proc. IEEE 67, 1456 (1979).
    [Crossref]
  5. M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).
  6. G. Nath, “Device for Material Working by a Laser Beam and Method for its Production,” U.S. Patent3, 843, 865 (1974).
  7. D. E. Williamson, J. Opt. Soc. Am. 42, 712 (1952).
    [Crossref]

1979 (1)

H. Kuwahara, H. Furuta, Proc. IEEE 67, 1456 (1979).
[Crossref]

1978 (2)

M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).

C. T. Chang, D. C. Auth, J. Opt. Soc. Am. 68, 1191 (1978).
[Crossref]

1976 (1)

T. Ozeki, B. S. Kawasaki, Appl. Phys. Lett. 28, 528 (1976).
[Crossref]

1975 (1)

T. Ozeki, T. Ito, T. Tamura, Appl. Phys. Lett. 26, 386 (1975).
[Crossref]

1952 (1)

Auth, D. C.

Brenci, M.

M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).

Chang, C. T.

Checcacci, P. F.

M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).

Falciai, R.

M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).

Furuta, H.

H. Kuwahara, H. Furuta, Proc. IEEE 67, 1456 (1979).
[Crossref]

Ito, T.

T. Ozeki, T. Ito, T. Tamura, Appl. Phys. Lett. 26, 386 (1975).
[Crossref]

Kawasaki, B. S.

T. Ozeki, B. S. Kawasaki, Appl. Phys. Lett. 28, 528 (1976).
[Crossref]

Kuwahara, H.

H. Kuwahara, H. Furuta, Proc. IEEE 67, 1456 (1979).
[Crossref]

Nath, G.

G. Nath, “Device for Material Working by a Laser Beam and Method for its Production,” U.S. Patent3, 843, 865 (1974).

Ozeki, T.

T. Ozeki, B. S. Kawasaki, Appl. Phys. Lett. 28, 528 (1976).
[Crossref]

T. Ozeki, T. Ito, T. Tamura, Appl. Phys. Lett. 26, 386 (1975).
[Crossref]

Scheggi, A. M.

M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).

Tamura, T.

T. Ozeki, T. Ito, T. Tamura, Appl. Phys. Lett. 26, 386 (1975).
[Crossref]

Williamson, D. E.

Alta Freq. (1)

M. Brenci, P. F. Checcacci, R. Falciai, A. M. Scheggi, Alta Freq. 47, 404 (1978).

Appl. Phys. Lett. (2)

T. Ozeki, T. Ito, T. Tamura, Appl. Phys. Lett. 26, 386 (1975).
[Crossref]

T. Ozeki, B. S. Kawasaki, Appl. Phys. Lett. 28, 528 (1976).
[Crossref]

J. Opt. Soc. Am. (2)

Proc. IEEE (1)

H. Kuwahara, H. Furuta, Proc. IEEE 67, 1456 (1979).
[Crossref]

Other (1)

G. Nath, “Device for Material Working by a Laser Beam and Method for its Production,” U.S. Patent3, 843, 865 (1974).

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Figures (6)

Fig. 1
Fig. 1

Enlarged tapered end with a1/a2 0.2, L ≃ 3 cm.

Fig. 2
Fig. 2

Experimental setup for near- and far-field pattern measurements.

Fig. 3
Fig. 3

Measured far-field patterns for fibers with different taper ratios.

Fig. 4
Fig. 4

Total acceptance angle vs a1/a2 for a number of tapered fibers with different L.

Fig. 5
Fig. 5

Near-(lower) and far-(upper) field intensity patterns measured on a tapered fiber (a1/a2 = 0.5, L = 20 cm) illuminated at either the larger or smaller end with N.A. = 0.28. Dashed lines correspond to the uniform fiber.

Fig. 6
Fig. 6

Near-(lower) and far-(upper) field intensity patterns measured on a tapered fiber (a1/a2 = 0.5, L = 20 cm) when illuminated at either the larger or the smaller end with N.A. = 0.15. Dashed lines correspond to the uniform fiber.

Equations (2)

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θ a = a 1 / a 2 n 1 2 - n 2 2 ,
θ c = 1 - ( n 2 / n 1 ) 2

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