Abstract

For the first time femtosecond-laser writing has inscribed low-loss optical waveguides in Schott BK7 glass, a commercially important type of borosilicate widely used in optical applications. The use of a variable repetition rate laser enabled the identification of a narrow processing window at 1MHz repetition rate with optimal waveguides exhibiting propagation losses of 0.3dB/cm and efficient mode matching to standard optical fibers at a 1550nm wavelength. The waveguides were characterized by complementary phase contrast and optical transmission microscopy, identifying a micrometer-sized guiding region within a larger complex structure of both positive and negative refractive index variations.

© 2008 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
  20. C. B. Schaffer, A. Brodeur, and E. Mazur, “Laser-induced breakdown and damage in bulk transparent materials induced by tightly focused femtosecond laser pulses,” Meas. Sci. Technol. 12, 1784-1794 (2001).
    [CrossRef]
  21. C. Hnatovsky, R. S. Taylor, E. Simova, V. R. Bhardwaj, D. M. Rayner, and P. B. Corkum, “High-resolution study of photoinduced modification in fused silica produced by a tightly focused femtosecond laser beam in the presence of aberrations,” J. Appl. Phys. 98, 013517 (2005).
    [CrossRef]

2007 (2)

R. Graf, A. Fernandez, M. Dubov, H. J. Brueckner, B. N. Chichkov, and A. Apolonski, “Pearl-chain waveguides written at megahertz repetition rate,” Appl. Phys. B 87, 21-27 (2007).
[CrossRef]

M. Sakakura, M. Terazima, Y. Shimotsuma, K. Miura, and K. Hirao, “Heating and rapid cooling of bulk glass after photoexcitation by a focused femtosecond laser pulse,” Opt. Express 15, 16800-16807 (2007).
[CrossRef] [PubMed]

2006 (3)

A. Mermillod-Blondin, I. M. Burakov, R. Stoian, A. Rosenfeld, E. Audouard, N. Bulgakova, and I. V. Hertel, “Direct observation of femtosecond laser induced modifications in the bulk of fused silica by phase contrast microscopy,” J. Laser Micro/Nanoeng. 1, 155-160 (2006).
[CrossRef]

L. M. Tong, R. R. Gattass, I. Maxwell, J. B. Ashcom, and E. Mazur, “Optical loss measurements in femtosecond laser written waveguides in glass,” Opt. Commun. 259, 626-630(2006).
[CrossRef]

R. Osellame, N. Chiodo, G. Della Valle, G. Cerullo, R. Ramponi, P. Laporta, A. Killi, U. Morgner, and O. Svelto, “Waveguide lasers in the C-band fabricated by laser inscription with a compact femtosecond oscillator,” IEEE J. Sel. Top. Quantum Electron. 12, 277-285 (2006).
[CrossRef]

2005 (4)

C. Hnatovsky, R. S. Taylor, E. Simova, V. R. Bhardwaj, D. M. Rayner, and P. B. Corkum, “High-resolution study of photoinduced modification in fused silica produced by a tightly focused femtosecond laser beam in the presence of aberrations,” J. Appl. Phys. 98, 013517 (2005).
[CrossRef]

R. Osellame, N. Chiodo, V. Maselli, A. Yin, M. Zavelani-Rossi, G. Cerullo, P. Laporta, L. Aiello, S. De Nicola, P. Ferraro, A. Finizio, and G. Pierattini, “Optical properties of waveguides written by a 26 MHz stretched cavity Ti:Sapphire femtosecond oscillator,” Opt. Express 13, 612-620 (2005).
[CrossRef] [PubMed]

S. M. Eaton, H. Zhang, P. R. Herman, F. Yoshino, L. Shah, J. Bovatsek, and A. Y. Arai, “Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate,” Opt. Express 13, 4708-4716 (2005).
[CrossRef] [PubMed]

V. R. Bhardwaj, E. Simova, P. B. Corkum, D. M. Rayner, C. Hnatovsky, R. S. Taylor, B. Schreder, M. Kluge, and J. Zimmer, “Femtosecond laser-induced refractive index modification in multicomponent glasses,” J. Appl. Phys. 97, 083102 (2005).
[CrossRef]

2004 (2)

S. Juodkazis, H. Misawa, and I. Maksimov, “Thermal accumulation effect in three-dimensional recording by picosecond pulses,” Appl. Phys. Lett. 85, 5239-5241 (2004).
[CrossRef]

D. Ehrt, T. Kittel, M. Will, S. Nolte, and A. Tünnermann, “Femtosecond-laser-writing in various glasses,” J. Non-Cryst. Solids 345, 332-337 (2004).
[CrossRef]

2003 (3)

J. W. Chan, T. R. Huser, S. H. Risbud, and D. M. Krol, “Modification of the fused silica glass network associated with waveguide fabrication using femtosecond laser pulses,” Appl. Phys. A 76, 367-372 (2003).
[CrossRef]

C. B. Schaffer, J. F. Garcia, and E. Mazur, “Bulk heating of transparent materials using a high-repetition-rate femtosecond laser,” Appl. Phys. A 76, 351-354 (2003).
[CrossRef]

C. Florea and K. A. Winick, “Fabrication and characterization of photonic devices directly written in glass using femtosecond laser pulses,” J. Lightwave Technol. 21, 246-253 (2003).
[CrossRef]

2002 (1)

2001 (2)

A. M. Streltsov and N. F. Borrelli, “Fabrication and analysis of a directional coupler written in glass by nanojoule femtosecond laser pulses,” Opt. Lett. 26, 42-43 (2001).
[CrossRef]

C. B. Schaffer, A. Brodeur, and E. Mazur, “Laser-induced breakdown and damage in bulk transparent materials induced by tightly focused femtosecond laser pulses,” Meas. Sci. Technol. 12, 1784-1794 (2001).
[CrossRef]

1997 (1)

K. Miura, J. R. Qiu, H. Inouye, T. Mitsuyu, and K. Hirao, “Photowritten optical waveguides in various glasses with ultrashort pulse laser,” Appl. Phys. Lett. 71, 3329-3331 (1997).
[CrossRef]

1996 (1)

1995 (1)

Appl. Opt. (1)

Appl. Phys. A (2)

C. B. Schaffer, J. F. Garcia, and E. Mazur, “Bulk heating of transparent materials using a high-repetition-rate femtosecond laser,” Appl. Phys. A 76, 351-354 (2003).
[CrossRef]

J. W. Chan, T. R. Huser, S. H. Risbud, and D. M. Krol, “Modification of the fused silica glass network associated with waveguide fabrication using femtosecond laser pulses,” Appl. Phys. A 76, 367-372 (2003).
[CrossRef]

Appl. Phys. B (1)

R. Graf, A. Fernandez, M. Dubov, H. J. Brueckner, B. N. Chichkov, and A. Apolonski, “Pearl-chain waveguides written at megahertz repetition rate,” Appl. Phys. B 87, 21-27 (2007).
[CrossRef]

Appl. Phys. Lett. (2)

S. Juodkazis, H. Misawa, and I. Maksimov, “Thermal accumulation effect in three-dimensional recording by picosecond pulses,” Appl. Phys. Lett. 85, 5239-5241 (2004).
[CrossRef]

K. Miura, J. R. Qiu, H. Inouye, T. Mitsuyu, and K. Hirao, “Photowritten optical waveguides in various glasses with ultrashort pulse laser,” Appl. Phys. Lett. 71, 3329-3331 (1997).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

R. Osellame, N. Chiodo, G. Della Valle, G. Cerullo, R. Ramponi, P. Laporta, A. Killi, U. Morgner, and O. Svelto, “Waveguide lasers in the C-band fabricated by laser inscription with a compact femtosecond oscillator,” IEEE J. Sel. Top. Quantum Electron. 12, 277-285 (2006).
[CrossRef]

J. Appl. Phys. (2)

V. R. Bhardwaj, E. Simova, P. B. Corkum, D. M. Rayner, C. Hnatovsky, R. S. Taylor, B. Schreder, M. Kluge, and J. Zimmer, “Femtosecond laser-induced refractive index modification in multicomponent glasses,” J. Appl. Phys. 97, 083102 (2005).
[CrossRef]

C. Hnatovsky, R. S. Taylor, E. Simova, V. R. Bhardwaj, D. M. Rayner, and P. B. Corkum, “High-resolution study of photoinduced modification in fused silica produced by a tightly focused femtosecond laser beam in the presence of aberrations,” J. Appl. Phys. 98, 013517 (2005).
[CrossRef]

J. Laser Micro/Nanoeng. (1)

A. Mermillod-Blondin, I. M. Burakov, R. Stoian, A. Rosenfeld, E. Audouard, N. Bulgakova, and I. V. Hertel, “Direct observation of femtosecond laser induced modifications in the bulk of fused silica by phase contrast microscopy,” J. Laser Micro/Nanoeng. 1, 155-160 (2006).
[CrossRef]

J. Lightwave Technol. (1)

J. Non-Cryst. Solids (1)

D. Ehrt, T. Kittel, M. Will, S. Nolte, and A. Tünnermann, “Femtosecond-laser-writing in various glasses,” J. Non-Cryst. Solids 345, 332-337 (2004).
[CrossRef]

J. Opt. Soc. Am. B (1)

Meas. Sci. Technol. (1)

C. B. Schaffer, A. Brodeur, and E. Mazur, “Laser-induced breakdown and damage in bulk transparent materials induced by tightly focused femtosecond laser pulses,” Meas. Sci. Technol. 12, 1784-1794 (2001).
[CrossRef]

Opt. Commun. (1)

L. M. Tong, R. R. Gattass, I. Maxwell, J. B. Ashcom, and E. Mazur, “Optical loss measurements in femtosecond laser written waveguides in glass,” Opt. Commun. 259, 626-630(2006).
[CrossRef]

Opt. Express (4)

Opt. Lett. (2)

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Figures (4)

Fig. 1
Fig. 1

Overhead OTM images of waveguides written at a 75 μm depth, a 0.5 mm / s speed, and repetition rates of (a)  100 kHz , (b)  1 MHz , and (c)  2 MHz . Average power was 200 mW in (a) and 375 mW in (b) and (c).

Fig. 2
Fig. 2

(a) PCM and (b) OTM cross-sectional images of waveguides written at a 1 MHz repetition rate with a 375 mW power ( 375 nJ pulse energy), a 1.5 mm / s scan speed, and writing depths of 75, 150, and 300 μm . Laser radiation was incident from the top. Arrows indicate the guiding regions with positive refractive index change.

Fig. 3
Fig. 3

(a) PCM and (b) OTM cross-sectional images of waveguides written at 1 MHz with a 375 mW power ( 375 nJ pulse energy), a 150 μm depth, and scan speeds of 0.2, 0.5, 1, 1.5, and 2 mm / s . Laser radiation was incident from the top.

Fig. 4
Fig. 4

OTM cross-sectional image (right) and corresponding 1550 nm wavelength near-field intensity profile (left) of waveguide fabricated with a 375 mW power, a 1.5 mm / s scan speed, and a 75 μm depth. The arrow indicates the guiding region where the mode was observed.

Tables (1)

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Table 1 Waveguide Insertion Loss and MFD at a 1 MHz Repetition Rate and a 375 mW Power

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