Abstract

A hollow-fiber bundle was designed and used to deliver high-peak-power pulses from a Q-switched Nd:YAG laser. An 80 cm long bundle with a total diameter of 5.5mm was composed of 37 glass capillaries with bore diameters of 0.7mm. Beam-resizing optics with two lenses were used to couple the laser beam into the bundle. The measured coupling loss due to the limited aperture ratio of the bundle was 2.3dB, and the transmission loss at wavelengths of 1064 and 532nm was 0.3dB. When an inert gas flowed through the bores of the capillaries, the maximum output pulse energy was 200mJ, which was the limit of the laser used in the experiment. Hollow-fiber bundles withstand irradiation better than single hollow fibers and silica-glass optical fibers do. They are suitable for many dermatological applications because they can be used to irradiate a large area.

© 2006 Optical Society of America

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References

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2005

O. Yilmaz, Y. Matsuura, and M. Miyagi, "Bundled aluminum hollow-core fibers for delivery of ultraviolet laser beam," Opt. Eng. 44, 106501 (2005).
[CrossRef]

2002

2001

T. Schmidt-Uhlig, P. Karlitschek, G. Marowsky, and Y. Sano, "New simplified coupling scheme for the delivery of 20 MW Nd:YAG laser pulses by large core optical fibers," Appl. Phys. B 72, 183-186 (2001).

2000

1998

1997

1996

D. P. Hand, D. Su, M. Naeem, and J. D. C. Jones, "Fiber optic high-quality Nd:YAG beam delivery for materials processing," Opt. Eng. 35, 502-506 (1996).
[CrossRef]

1994

1990

W. M. Trott and K. D. Meeks, "High-power Nd:glass laser transmission through optical fibers and its use in acceleration of thin foil targets," J. Appl. Phys. 67, 3297-3301 (1990).
[CrossRef]

1985

Allison, S. W.

Arai, T.

Ashida, H.

Gobin, I.

Goldberg, D.

D. Goldberg, ed., Laser Dermatology (Springer, 2005), Chap. 3.
[CrossRef]

Hanamoto, K.

Hand, D. P.

D. P. Hand, D. Su, M. Naeem, and J. D. C. Jones, "Fiber optic high-quality Nd:YAG beam delivery for materials processing," Opt. Eng. 35, 502-506 (1996).
[CrossRef]

Jones, J. D. C.

D. P. Hand, D. Su, M. Naeem, and J. D. C. Jones, "Fiber optic high-quality Nd:YAG beam delivery for materials processing," Opt. Eng. 35, 502-506 (1996).
[CrossRef]

Karlitschek, P.

T. Schmidt-Uhlig, P. Karlitschek, G. Marowsky, and Y. Sano, "New simplified coupling scheme for the delivery of 20 MW Nd:YAG laser pulses by large core optical fibers," Appl. Phys. B 72, 183-186 (2001).

Magnuson, D. W.

Marowsky, G.

T. Schmidt-Uhlig, P. Karlitschek, G. Marowsky, and Y. Sano, "New simplified coupling scheme for the delivery of 20 MW Nd:YAG laser pulses by large core optical fibers," Appl. Phys. B 72, 183-186 (2001).

Matsuura, Y.

Meeks, K. D.

W. M. Trott and K. D. Meeks, "High-power Nd:glass laser transmission through optical fibers and its use in acceleration of thin foil targets," J. Appl. Phys. 67, 3297-3301 (1990).
[CrossRef]

Miyagi, M.

Naeem, M.

D. P. Hand, D. Su, M. Naeem, and J. D. C. Jones, "Fiber optic high-quality Nd:YAG beam delivery for materials processing," Opt. Eng. 35, 502-506 (1996).
[CrossRef]

Ohshiro, T.

T. Ohshiro, The Role of the Laser in Dermatology: An Atlas (Wiley, 1997).

Pagano, T. S.

Richou, B.

Richou, J.

Sano, Y.

T. Schmidt-Uhlig, P. Karlitschek, G. Marowsky, and Y. Sano, "New simplified coupling scheme for the delivery of 20 MW Nd:YAG laser pulses by large core optical fibers," Appl. Phys. B 72, 183-186 (2001).

Sato, S.

Schertz, I.

Schmidt-Uhlig, T.

T. Schmidt-Uhlig, P. Karlitschek, G. Marowsky, and Y. Sano, "New simplified coupling scheme for the delivery of 20 MW Nd:YAG laser pulses by large core optical fibers," Appl. Phys. B 72, 183-186 (2001).

Shi, Y. W.

Su, D.

D. P. Hand, D. Su, M. Naeem, and J. D. C. Jones, "Fiber optic high-quality Nd:YAG beam delivery for materials processing," Opt. Eng. 35, 502-506 (1996).
[CrossRef]

Takada, G.

Tillies, G. T.

Trott, W. M.

W. M. Trott and K. D. Meeks, "High-power Nd:glass laser transmission through optical fibers and its use in acceleration of thin foil targets," J. Appl. Phys. 67, 3297-3301 (1990).
[CrossRef]

Wyrowski, F.

Yamamoto, T.

Yilmaz, O.

O. Yilmaz, Y. Matsuura, and M. Miyagi, "Bundled aluminum hollow-core fibers for delivery of ultraviolet laser beam," Opt. Eng. 44, 106501 (2005).
[CrossRef]

Zuidema, R.

Appl. Opt.

Appl. Phys. B

T. Schmidt-Uhlig, P. Karlitschek, G. Marowsky, and Y. Sano, "New simplified coupling scheme for the delivery of 20 MW Nd:YAG laser pulses by large core optical fibers," Appl. Phys. B 72, 183-186 (2001).

J. Appl. Phys.

W. M. Trott and K. D. Meeks, "High-power Nd:glass laser transmission through optical fibers and its use in acceleration of thin foil targets," J. Appl. Phys. 67, 3297-3301 (1990).
[CrossRef]

Opt. Eng.

D. P. Hand, D. Su, M. Naeem, and J. D. C. Jones, "Fiber optic high-quality Nd:YAG beam delivery for materials processing," Opt. Eng. 35, 502-506 (1996).
[CrossRef]

O. Yilmaz, Y. Matsuura, and M. Miyagi, "Bundled aluminum hollow-core fibers for delivery of ultraviolet laser beam," Opt. Eng. 44, 106501 (2005).
[CrossRef]

Opt. Lett.

Other

T. Ohshiro, The Role of the Laser in Dermatology: An Atlas (Wiley, 1997).

D. Goldberg, ed., Laser Dermatology (Springer, 2005), Chap. 3.
[CrossRef]

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Figures (9)

Fig. 1
Fig. 1

(Color online) End face of a hollow-fiber bundle.

Fig. 2
Fig. 2

(Color online) Experiment setup for measuring the optical properties of bundled hollow fibers.

Fig. 3
Fig. 3

(Color online) Output beam profiles from straight and bent bundles ( λ = 532 nm ) .

Fig. 4
Fig. 4

Measured bending losses of single and bundled hollow fibers ( λ = 532 nm ) .

Fig. 5
Fig. 5

Measured loss as a function of input energy ( λ = 1064 nm ) .

Fig. 6
Fig. 6

Schematic view of gas-flow attachment.

Fig. 7
Fig. 7

Measured output energy as a function of input energy for fiber bundles with (•) and without (∘) gas flow.

Fig. 8
Fig. 8

Aperture ratio as a function of wall thickness for bundled hollow fibers with circular and hexagonal cross sections.

Fig. 9
Fig. 9

(Color online) End face of a fused hollow-fiber bundle.

Equations (66)

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5.5 mm
0.7 mm
2.3 dB
532 nm
0.3 dB
200 mJ
20 MW
532 nm
700 μm
850 μm
( 60 % )
20 cm
80 cm
60 cm
30 cm
5.5 mm
8.2 mm
( f 1 = 15 cm )
( f 2 = 8 cm )
4.6 mm
1 mrad
230 mJ
10 Hz
1 cm
( f = 3 cm )
2.3 dB
0.3 dB
20 cm
60 cm
105 mJ
18 MW
6 ns
230 mJ
10 Hz
( 450 mJ )
400 mJ
180 mJ
30 MW
200 mJ
10 Hz
500 ml / min
70 kPa
30 cm
450 mJ
200 mJ
33 MW
0.7 mm
80 μm
60 %
73 %
10 %
1650 °C
1700 °C
1680 °C
1.5 atm
83 %
0.2 dB
5.5 mm
0.7 mm
2.3 dB
532 nm
0.3 dB
200 mJ
( λ = 532 nm )
( λ = 532 nm )
( λ = 1064 nm )

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