Abstract

A new gradient-index lens with high numerical aperture has been fabricated by a new ion-exchange tech­nique. In this treatment, a glass rod doped with a highly polarizable ion (dopant A) is immersed into KNO3 salt doped with a medium polarizability ion (dopant B). Dopant B penetrates into the rod and modifies the refractive-index profile of the lens. This new lens has 0.6 N.A. and gives a 1.18-μm spot diam in the light-focusing system. This lens gives good results also in a light source coupling system and is useful in microoptic devices.

© 1983 Optical Society of America

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References

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  1. W. Streifer, K. B. Paxton, Appl. Opt. 10, 769 (1971).
    [CrossRef] [PubMed]
  2. W. J. Tomlinson, Appl. Opt. 19, 1127 (1980).
    [CrossRef] [PubMed]
  3. T. Miyazawa, K. Okada, T. Kubo, K. Nishizawa, I. Kitano, K. Iga, Appl. Opt. 19, 1113 (1980).
    [CrossRef] [PubMed]
  4. T. Yamagishi, K. Fujii, I. Kitano, in Technical Digest, Conference on Lasers and Electrooptics (Optical Society of America, Washington, D.C., 1982), paper WN3.
  5. S. Takioka, Y. Sugiura, NHK (Nippon Hoso Kyokai) Tech. Res. 27, 10 (1975).

1980 (2)

1975 (1)

S. Takioka, Y. Sugiura, NHK (Nippon Hoso Kyokai) Tech. Res. 27, 10 (1975).

1971 (1)

Fujii, K.

T. Yamagishi, K. Fujii, I. Kitano, in Technical Digest, Conference on Lasers and Electrooptics (Optical Society of America, Washington, D.C., 1982), paper WN3.

Iga, K.

Kitano, I.

T. Miyazawa, K. Okada, T. Kubo, K. Nishizawa, I. Kitano, K. Iga, Appl. Opt. 19, 1113 (1980).
[CrossRef] [PubMed]

T. Yamagishi, K. Fujii, I. Kitano, in Technical Digest, Conference on Lasers and Electrooptics (Optical Society of America, Washington, D.C., 1982), paper WN3.

Kubo, T.

Miyazawa, T.

Nishizawa, K.

Okada, K.

Paxton, K. B.

Streifer, W.

Sugiura, Y.

S. Takioka, Y. Sugiura, NHK (Nippon Hoso Kyokai) Tech. Res. 27, 10 (1975).

Takioka, S.

S. Takioka, Y. Sugiura, NHK (Nippon Hoso Kyokai) Tech. Res. 27, 10 (1975).

Tomlinson, W. J.

Yamagishi, T.

T. Yamagishi, K. Fujii, I. Kitano, in Technical Digest, Conference on Lasers and Electrooptics (Optical Society of America, Washington, D.C., 1982), paper WN3.

Appl. Opt. (3)

NHK (Nippon Hoso Kyokai) Tech. Res. (1)

S. Takioka, Y. Sugiura, NHK (Nippon Hoso Kyokai) Tech. Res. 27, 10 (1975).

Other (1)

T. Yamagishi, K. Fujii, I. Kitano, in Technical Digest, Conference on Lasers and Electrooptics (Optical Society of America, Washington, D.C., 1982), paper WN3.

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Figures (11)

Fig. 1
Fig. 1

Refractive-index profile.

Fig. 2
Fig. 2

Optical setups for collimation and focusing.

Fig. 3
Fig. 3

Deviation from the desired index profile for meridional rays.

Fig. 4
Fig. 4

Ion concentration profiles of a new glass rod lens (using an x-ray microanalyzer).

Fig. 5
Fig. 5

Evaluating setup of light-focused spot.

Fig. 6
Fig. 6

Output power distribution of the high N.A. lens.

Fig. 7
Fig. 7

Output power distribution of lens (SLW).

Fig. 8
Fig. 8

Output power distribution of the high N.A. lens (working distance S = 1.0 mm).

Fig. 9
Fig. 9

Evaluating setup of coupling loss.

Fig. 10
Fig. 10

Coupling loss between LD and SI-200H fiber.

Fig. 11
Fig. 11

Coupling loss between LD and GI-50 fiber.

Equations (5)

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n 2 ( r ) = n 0 2 [ 1 ( g r ) 2 + h 4 ( g r ) 4 + h 6 ( g r ) 6 + ] ,
N . A . = [ n 0 2 n 2 ( r 0 ) ] [ 1 ( r / r 0 ) 2 ] .
N . A . = n 0 g r 0 1 ( r / r 0 ) 2 = N . A . 0 1 ( r / r 0 ) 2 .
D = 0.82 · λ / N . A . eff ,
N . A . = n 0 g r 0 / ( n 0 g S ) 2 + 1 .

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