Abstract

A vacuum-cored hollow waveguide has been found to transmit 1064-nm, Q-switched Nd:YAG laser pulses. With this scheme, laser-induced air breakdown was completely suppressed, and the laser-induced damage threshold of the waveguide’s inner coating was significantly increased. With a 1-m-long, 1-mm inner-diameter, cyclic olefin polymer–coated silver hollow waveguide, the maximum transmitted laser energy was as great as 158 mJ/pulse 20.1 J/cm2, at a repetition rate of 10 Hz in a 90°-bent waveguide condition. The corresponding transmitted peak laser power was 17.6 MW. With the transmitted laser pulses, deep ablation of myocardium tissues was demonstrated in vitro.

© 2000 Optical Society of America

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References

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  1. V. Sturm, R. Sattmann, and R. Noll, Appl. Phys. B 63, 363 (1996).
  2. B. Richou, I. Schertz, I. Gobin, and J. Richou, Appl. Opt. 36, 1610 (1997).
    [CrossRef] [PubMed]
  3. Y. Matsuura, K. Hanamoto, S. Sato, and M. Miyagi, Opt. Lett. 23, 1858 (1998).
    [CrossRef]
  4. S. Sato, H. Ashida, Y. Shi, Y. Matsuura, and M. Miyagi, Proc. SPIE 3596, 50 (1999).
    [CrossRef]
  5. H. Jelínková, J. Šulc, P. Černý, Y. Shi, Y. Matsuura, and M. Miyagi, Opt. Lett. 24, 957 (1999).
    [CrossRef]
  6. R. M. Wood, Laser Damage in Optical Materials (Hilger, London, 1986), Chap. 4.
  7. R. W. Waynant and M. N. Ediger, Electro-Optics Handbook (McGraw-Hill, New York, 1993), p. 24.22.

1999

S. Sato, H. Ashida, Y. Shi, Y. Matsuura, and M. Miyagi, Proc. SPIE 3596, 50 (1999).
[CrossRef]

H. Jelínková, J. Šulc, P. Černý, Y. Shi, Y. Matsuura, and M. Miyagi, Opt. Lett. 24, 957 (1999).
[CrossRef]

1998

1997

1996

V. Sturm, R. Sattmann, and R. Noll, Appl. Phys. B 63, 363 (1996).

Ashida, H.

S. Sato, H. Ashida, Y. Shi, Y. Matsuura, and M. Miyagi, Proc. SPIE 3596, 50 (1999).
[CrossRef]

Cerný, P.

Ediger, M. N.

R. W. Waynant and M. N. Ediger, Electro-Optics Handbook (McGraw-Hill, New York, 1993), p. 24.22.

Gobin, I.

Hanamoto, K.

Jelínková, H.

Matsuura, Y.

Miyagi, M.

Noll, R.

V. Sturm, R. Sattmann, and R. Noll, Appl. Phys. B 63, 363 (1996).

Richou, B.

Richou, J.

Sato, S.

S. Sato, H. Ashida, Y. Shi, Y. Matsuura, and M. Miyagi, Proc. SPIE 3596, 50 (1999).
[CrossRef]

Y. Matsuura, K. Hanamoto, S. Sato, and M. Miyagi, Opt. Lett. 23, 1858 (1998).
[CrossRef]

Sattmann, R.

V. Sturm, R. Sattmann, and R. Noll, Appl. Phys. B 63, 363 (1996).

Schertz, I.

Shi, Y.

H. Jelínková, J. Šulc, P. Černý, Y. Shi, Y. Matsuura, and M. Miyagi, Opt. Lett. 24, 957 (1999).
[CrossRef]

S. Sato, H. Ashida, Y. Shi, Y. Matsuura, and M. Miyagi, Proc. SPIE 3596, 50 (1999).
[CrossRef]

Sturm, V.

V. Sturm, R. Sattmann, and R. Noll, Appl. Phys. B 63, 363 (1996).

Šulc, J.

Waynant, R. W.

R. W. Waynant and M. N. Ediger, Electro-Optics Handbook (McGraw-Hill, New York, 1993), p. 24.22.

Wood, R. M.

R. M. Wood, Laser Damage in Optical Materials (Hilger, London, 1986), Chap. 4.

Appl. Opt.

Appl. Phys. B

V. Sturm, R. Sattmann, and R. Noll, Appl. Phys. B 63, 363 (1996).

Opt. Lett.

Proc. SPIE

S. Sato, H. Ashida, Y. Shi, Y. Matsuura, and M. Miyagi, Proc. SPIE 3596, 50 (1999).
[CrossRef]

Other

R. M. Wood, Laser Damage in Optical Materials (Hilger, London, 1986), Chap. 4.

R. W. Waynant and M. N. Ediger, Electro-Optics Handbook (McGraw-Hill, New York, 1993), p. 24.22.

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Figures (4)

Fig. 1
Fig. 1

Arrangement of the vacuum-cored hollow waveguide.

Fig. 2
Fig. 2

Dependence of (left) the transmitted laser energy and (right) transmission efficiency on the incident laser energy for straight and 90°-bent R50 cm waveguide conditions. The laser repetition rate is 10 Hz.

Fig. 3
Fig. 3

(a), (b) Time-integrated ablation patterns and (c), (d) intensity distributions of the transmitted laser beams. The distance between the position at which the ablation patterns were taken and the waveguide output end was 193 mm. The waveguide was straight for (a) and (c) but bent 90° for (b) and (d). The intensity distributions are for transmitted laser energies of 90 mJ/pulse.

Fig. 4
Fig. 4

Depth and diameter of ablated holes formed in porcine myocardium tissue as a function of the laser ablation energy. The waveguide was bent 90° R50 cm, and the number of pulses was 300. The transmitted laser beam was focused with a combination of a collimation lens and a focusing lens, and the tissue sample was irradiated near the focal point.

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