Abstract

Exposure of germanosilicate fibers to cw UV light at 351.1 nm from an argon-ion laser is shown to have dramatic effects on the seeded preparation of the material for second-harmonic generation. We show that 100 μW of 351.1-nm radiation for periods as short as 20 s leads to large, permanent enhancements of the second-harmonic conversion efficiency. The UV exposure provides an increase of 7 orders of magnitude in final conversion efficiency in one regime of IR preparation intensity and allows preparation with cw IR and second-harmonic wavelengths. In addition, the 351.1-nm wavelength was shown to erase the χ(2) grating much more efficiently than did 514.5-nm radiation.

© 1992 Optical Society of America

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References

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  1. E. V. Anoikin, E. M. Dianov, P. G. Kazansky, D. Yu. Stepanov, Opt. Lett. 15, 834 (1990).
    [CrossRef] [PubMed]
  2. A. Kamal, D. A. Weinberger, J. H. Chu, in Digest of Optical Society of America Annual Meeting (Optical Society of America, Washington, D.C., 1990), paper TuGG2.
  3. R. Kashyap, in Digest of Conference on Nonlinear Guided-Wave Phenomena: Physics and Applications (Optical Society of America, Washington, D.C., 1989), paper SB3.
  4. I. C. S. Carvalho, W. Margulis, Opt. Lett. 16, 1487 (1991).
    [CrossRef] [PubMed]
  5. R. H. Stolen, H. W. K. Tom, Opt. Lett. 12, 584 (1987).
    [CrossRef]
  6. R. Ouellette, R. O. Hill, D. Johnson, Opt. Lett. 13, 515 (1988).
    [CrossRef] [PubMed]
  7. I. C. S. Carvalho, W. Margulis, B. Lesche, in Digest of Conference on Quantum Electronics Laser Science (Optical Society of America, Washington, D.C., 1991), paper JTuA3.
  8. H. Scher, E. W. Montroll, Phys. Rev. B 12, 2455 (1975).
    [CrossRef]

1991 (1)

1990 (1)

1988 (1)

1987 (1)

R. H. Stolen, H. W. K. Tom, Opt. Lett. 12, 584 (1987).
[CrossRef]

1975 (1)

H. Scher, E. W. Montroll, Phys. Rev. B 12, 2455 (1975).
[CrossRef]

Anoikin, E. V.

Carvalho, I. C. S.

I. C. S. Carvalho, W. Margulis, Opt. Lett. 16, 1487 (1991).
[CrossRef] [PubMed]

I. C. S. Carvalho, W. Margulis, B. Lesche, in Digest of Conference on Quantum Electronics Laser Science (Optical Society of America, Washington, D.C., 1991), paper JTuA3.

Chu, J. H.

A. Kamal, D. A. Weinberger, J. H. Chu, in Digest of Optical Society of America Annual Meeting (Optical Society of America, Washington, D.C., 1990), paper TuGG2.

Dianov, E. M.

Hill, R. O.

Johnson, D.

Kamal, A.

A. Kamal, D. A. Weinberger, J. H. Chu, in Digest of Optical Society of America Annual Meeting (Optical Society of America, Washington, D.C., 1990), paper TuGG2.

Kashyap, R.

R. Kashyap, in Digest of Conference on Nonlinear Guided-Wave Phenomena: Physics and Applications (Optical Society of America, Washington, D.C., 1989), paper SB3.

Kazansky, P. G.

Lesche, B.

I. C. S. Carvalho, W. Margulis, B. Lesche, in Digest of Conference on Quantum Electronics Laser Science (Optical Society of America, Washington, D.C., 1991), paper JTuA3.

Margulis, W.

I. C. S. Carvalho, W. Margulis, Opt. Lett. 16, 1487 (1991).
[CrossRef] [PubMed]

I. C. S. Carvalho, W. Margulis, B. Lesche, in Digest of Conference on Quantum Electronics Laser Science (Optical Society of America, Washington, D.C., 1991), paper JTuA3.

Montroll, E. W.

H. Scher, E. W. Montroll, Phys. Rev. B 12, 2455 (1975).
[CrossRef]

Ouellette, R.

Scher, H.

H. Scher, E. W. Montroll, Phys. Rev. B 12, 2455 (1975).
[CrossRef]

Stepanov, D. Yu.

Stolen, R. H.

R. H. Stolen, H. W. K. Tom, Opt. Lett. 12, 584 (1987).
[CrossRef]

Tom, H. W. K.

R. H. Stolen, H. W. K. Tom, Opt. Lett. 12, 584 (1987).
[CrossRef]

Weinberger, D. A.

A. Kamal, D. A. Weinberger, J. H. Chu, in Digest of Optical Society of America Annual Meeting (Optical Society of America, Washington, D.C., 1990), paper TuGG2.

Opt. Lett. (4)

Phys. Rev. B (1)

H. Scher, E. W. Montroll, Phys. Rev. B 12, 2455 (1975).
[CrossRef]

Other (3)

A. Kamal, D. A. Weinberger, J. H. Chu, in Digest of Optical Society of America Annual Meeting (Optical Society of America, Washington, D.C., 1990), paper TuGG2.

R. Kashyap, in Digest of Conference on Nonlinear Guided-Wave Phenomena: Physics and Applications (Optical Society of America, Washington, D.C., 1989), paper SB3.

I. C. S. Carvalho, W. Margulis, B. Lesche, in Digest of Conference on Quantum Electronics Laser Science (Optical Society of America, Washington, D.C., 1991), paper JTuA3.

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Figures (5)

Fig. 1
Fig. 1

IR intensity dependence of the saturated conversion efficiency for virgin fibers and fibers preexposed to 100 μW of 351.1-nm radiation. The fibers were optically encoded and read out by a mode-locked Nd:YAG laser. The average intrafiber second-harmonic seed power transmitted through the fiber was held constant at 90 mW.

Fig. 2
Fig. 2

IR intensity dependence of cw-prepared fibers preexposed to 100 μW of 351.1-nm radiation. The fiber was prepared and read out with the mode locker switched off. The preparation stage used 30 μW of cw 532-nm light.

Fig. 3
Fig. 3

Plot of the required UV dosage for saturated cw preparation of a fiber. The fiber was irradiated with 100 μW of UV light before each repreparation.

Fig. 4
Fig. 4

Log–log plot of effective χ(2) enhancement versus UV intensity. Each fiber was exposed to the UV light for 4 s and then prepared for 15 min to saturation with cw (not mode locked) fundamental and second-harmonic wavelengths. The slope of 1.3 for the linear fit indicates that the enhancement is probably due to single-photon excitation by the UV light.

Fig. 5
Fig. 5

Erasure curves of SH power of prepared fibers exposed to cw 351.1- and 514.5-nm radiation. The triangles denote erasure by 514.5-nm light, and the remaining symbols indicate erasure by the various UV powers indicated. The 514.5-nm erasure is fitted to the expression presented by Ouellette et al.6

Equations (1)

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d χ ( 2 ) d t - I UV [ χ ( 2 ) ] 2 ,

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