Investigation of ultrafast laser-photonic material interactions: Challenges for directly written glass photonics

IEEE Journal on Selected Topics in Quantum Electronics

Volumn 14, Issue 5, 2008, Pages 1370-1388

  Ams, Martin ^a   Marshall, Graham D ^a   Dekker, Peter ^a   Dubov, Mykhaylo ^b   Mezentsev, Vladimir K ^b   Bennion, Ian ^b   Withford, Michael J ^a  

^a MACQUARIE UNIVERSITY   (Australia)

^b ASTON UNIVERSITY   (United Kingdom)

Author keywords

Laser machining; Laser materials processing applications; Optical glass; Optical waveguides; Ultrafast optics

Indexed keywords

GLASS; LASERS; LIGHT AMPLIFIERS; OPTICAL WAVEGUIDES; OPTOELECTRONIC DEVICES; PULSED LASER APPLICATIONS; SILICA; ULTRASHORT PULSES; WAVEGUIDES;

LASER MACHINING; LASER MATERIALS PROCESSING APPLICATIONS; OPTICAL GLASS; ULTRAFAST OPTICS;

FUSED SILICA;

EID: 53349178743     PISSN: 1077260X     EISSN: None     Source Type: Journal    
DOI: 10.1109/JSTQE.2008.925809     Document Type: Article

References (100)

1. K. M. Davis, K. Miura, N. Sugimoto, and K. Hirao, "Writing waveguides in glass with a femtosecond laser," Opt. Lett., vol. 21, no. 21, pp. 1729-1731, 1996.
2. E. N. Glezer, M. Milosavljevic, L. Huang, R. J. Finlay, T. H. Her, J. P. Callan, and E. Mazur, "Three-dimensional optical storage inside transparent materials," Opt. Lett., vol. 21, no. 24, pp. 2023-2025, 1996.
3. 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., vol. 12, no. 11, pp. 1784-1794, 2001.
4. D. Homoelle, S. Wielandy, A. L. Gaeta, N. F. Borrelli, and C. Smith, "Infrared photosensitivity in silica glasses exposed to femtosecond laser pulses," Opt. Lett., vol. 24, no. 18, pp. 1311-1313, 1999.
5. O. M. Efimov, L. B. Glebov, K. A. Richardson, E. Van Stryland, T. Cardinal, S. H. Park, M. Couzi, and J. L. Bruneel, "Waveguide writing in chalcogenide glasses by a train of femtosecond laser pulses," Opt. Mater., vol. 17, no. 3, pp. 379-386, 2001.
6. S. Nolte, M. Will, J. Burghoff, and A. Tuennermann, "Femtosecond waveguide writing: A new avenue to three-dimensional integrated optics," Appl. Phys. A, Mater. Sci. Process., vol. 77, no. 1, pp. 109-111, 2003.
7. J. R. Liu, Z. Y. Zhang, S. D. Chang, C. Flueraru, and C. P. Grover, "Directly writing in fused of 1-to-n optical waveguide power splitters silica glass using a femtosecond laser," Opt. Commun., vol. 253, no. 4-6, pp. 315-319, 2005.
8. D. K. Y. Low, H. Xie, Z. Xiong, and G. C. Lim, "Femtosecond laser direct writing of embedded optical waveguides in aluminosilicate glass," Appl. Phys. A, Mater. Sci. Process., vol. 81, no. 8, pp. 1633-1638, 2005.
9. A.M. Streltsov and N. F. Borrelli, "Fabrication and analysis of a directional coupler written in glass by nanojoule femtosecond laser pulses," Opt. Lett., vol. 26, no. 1, pp. 42-43, 2001.
10. K. Minoshima, A. M. Kowalevicz, E. P. Ippen, and J. G. Fujimoto, "Fabrication of coupled mode photonic devices in glass by nonlinear femtosecond laser materials processing," Opt. Exp., vol. 10, no. 15, pp. 645-652, 2002.
11. W. Watanabe, T. Asano, K. Yamada, K. Itoh, and J. Nishii, "Wavelength division with three-dimensional couplers fabricated by filamentation of femtosecond laser pulses," Opt. Lett., vol. 28, no. 24, pp. 2491-2493, 2003.
12. T. Pertsch, U. Peschel, F. Lederer, J. Burghoff, M. Will, S. Nolte, and A. Tunnermann, "Discrete diffraction in two-dimensional arrays of coupled waveguides in silica," Opt. Lett., vol. 29, no. 5, pp. 468-470, 2004.
13. A. M. Kowalevicz, V. Sharma, E. P. Ippen, J. G. Fujimoto, and K. Minoshima, "Three-dimensional photonic devices fabricated in glass by use of a femtosecond laser oscillator," Opt. Lett., vol. 30, no. 9, pp. 1060-1062, 2005.
14. A. Martinez, M. Dubov, I. Khrushchev, and I. Bennion, "Direct writing of fibre Bragg gratings by femtosecond laser," Electron. Lett., vol. 40, no. 19, pp. 1170-1172, 2004.
15. E. Wikszak, J. Burghoff, M. Will, S. Nolte, A. Tunnermann, and T. Gabler, "Recording of fiber Bragg gratings with femtosecond pulses using a "point by point" technique," in Proc. Lasers Electro-Opt 2004 (CLEO) Conf., J. Burghoff, Ed., May, vol. 2, pp. 1-2, Paper CThM7.
16. L. Sudrie, M. Franco, B. Prade, and A. Mysyrewicz, "Writing of permanent birefringent microlayers in bulk fused silica with femtosecond laser pulses," Opt. Commun., vol. 171, no. 4-6, pp. 279-284, 1999.
17. 2 thin films on silicon by a single femtosecond laser pulse," Appl. Phys. Lett., vol. 78, no. 8, pp. 1038-1040, 2001.
18. C. Florea and K. A. Winick, "Fabrication and characterization of photonic devices directly written in glass using femtosecond laser pulses," J. Lightw. Technol., vol. 21, no. 1, pp. 246-253, Jan. 2003.
19. N.Takeshima,Y. Narita, S. Tanaka,Y.Kuroiwa, and K.Hirao, "Fabrication of high-efficiency diffraction gratings in glass," Opt. Lett., vol. 30, no. 4, pp. 352-354, 2005.
20. J. Liu, Z. Zhang, Z. Lu, G. Xiao, F. Sun, S. Chang, and C. Flueraru, "Fabrication and stitching of embedded multi-layer micro-gratings in fused silica glass by fs laser pulses," Appl. Phys. B, Lasers Opt., vol. 86, no. 1, pp. 151-154, 2007.
21. Y. Sikorski, A. A. Said, P. Bado, R. Maynard, C. Florea, and K. A. Winick, "Optical waveguide amplifier in Nd-doped glass written with near-IR femtosecond laser pulses," Electron. Lett., vol. 36, no. 3, pp. 226-227, 2000.
22. R. Osellame, S. Taccheo, M. Marangoni, R. Ramponi, P. Laporta, D. Polli, S. De Silvestri, and G. Cerullo, "Femtosecond writing of active optical waveguides with astigmatically shaped beams," J. Opt. Soc. Amer. B, Opt. Phys., vol. 20, no. 7, pp. 1559-1567, 2003.
23. G. Della Valle, R. Osellame, N. Chiodo, S. Taccheo, G. Cerullo, P. Laporta, A. Killi, U. Morgner, M. Lederer, and D. Kopf, "C-band waveguide amplifier produced by femtosecond laser writing," Opt. Exp., vol. 13, no. 16, pp. 5976-5982, 2005.
24. N. D. Psaila, R. R. Thomson, H. T. Bookey, A. K. Kar, N. Chiodo, R. Osellame, G. Cerullo, A. Jha, and S. Shen, "Er:Yb-doped oxyfluoride silicate glass waveguide amplifier fabricated using femtosecond laser inscription," Appl. Phys. Lett., vol. 90, no. 13, pp. 131102-1-131102-3, 2007.
25. E. Bricchi, J. D. Mills, P. G. Kazansky,B. G. Klappauf, andJ. J. Baumberg, "Birefringent Fresnel zone plates in silica fabricated by femtosecond laser machining," Opt. Lett., vol. 27, no. 24, pp. 2200-2202, 2002.
26. W. J. Cai, A. R. Libertun, and R. Piestun, "Polarization selective computer-generated holograms realized in glass by femtosecond laser induced nanogratings," Opt. Exp., vol. 14, no. 9, pp. 3785-3791, 2006.
27. W. Yang, P. G. Kazansky, and Y. P. Svirko, "Non-reciprocal ultrafast laser writing," Nature Photon., vol. 2, no. 2, pp. 99-104, 2008.
28. S. M. Eaton, H. B. Zhang, and P. R. Herman, "Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate," Opt. Exp., vol. 13, no. 12, pp. 4708-4716, 2005.
29. G. Della Valle, S. Taccheo, R. Osellame, A. Festa, G. Cerullo, and P. Laporta, "1.5 mu m single longitudinal mode waveguide laser fabricated by femtosecond laser writing," Opt. Exp., vol. 15, no. 6, pp. 3190-3194, 2007.
30. G. Li, X. Baoxi, and C. T. Chong, "Microstructure in lithium niobate by use of focused femtosecond laser pulses," IEEE Photon. Technol. Lett., vol. 16, no. 5, pp. 1337-1339, May 2004.
31. H. T. Bookey, R. R. Thomson, N. D. Psaila, A. K. Kar, N. Chiodo, R. Osellame, and G. Cerullo, "Femtosecond laser inscription of low insertion loss waveguides in z-cut lithium niobate," IEEE Photon. Technol. Lett., vol. 19, no. 9-12, pp. 892-894, Jun. 2007.
32. 3+ crystal by femtosecond laser writing," Opt. Lett., vol. 30, no. 17, pp. 2248-2250, 2005.
33. 4+ crystals by femtosecond laser irradiation," in Proc. Conf. Lasers Electro-Opt (CLEO): OSA Trends Opt. Photon. Ser. Washington, DC: Optical Society of America, 2004, vol. 96, p. CWA49.
34. K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, "Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals," Appl. Phys. Lett., vol. 84, no. 3, pp. 311-313, 2004.
35. A. H. Nejadmalayeri, P. R. Herman, J. Burghoff, M. Will, S. Nolte, and A. Tunnermann, "Inscription of optical waveguides in crystalline silicon by mid-infrared femtosecond laser pulses," Opt. Lett., vol. 30, no. 9, pp. 964-966, 2005.
36. 3+ :sapphire," Appl. Phys. Lett., vol. 85, no. 7, pp. 1122-1124, 2004.
37. S. Sowa, W. Watanabe, T. Tamaki, J. Nishii, and K. Itoh, "Symmetric waveguides in poly (methyl methacrylate) fabricated by femtosecond laser pulses," Opt. Exp., vol. 14, no. 1, pp. 291-297, 2006.
38. B. C. Stuart, M. D. Feit, S. Herman, A. M. Rubenchik, B. W. Shore, and M. D. Perry, "Nanosecond-to-femtosecond laser-induced breakdown in dielectrics," Phys. Rev. B, vol. 53, no. 4, pp. 1749-1761, 1996.
39. A. Kaiser, B. Rethfeld, M. Vicanek, and G. Simon, " Microscopicprocesses in dielectrics under irradiation by subpicosecond laser pulses," Phys. Rev. B, vol. 61, no. 17, pp. 11437-11450, 2000.
40. A. Zoubir, M. Richardson, L. Canioni, A. Brocas, and L. Sarger, "Optical properties of infrared femtosecond laser-modified fused silica and application to waveguide fabrication," J. Opt. Soc. Amer. B, Opt. Phys., vol. 22, no. 10, pp. 2138-2143, 2005.
41. D. Blomer, A. Szameit, F. Dreisow, T. Schreiber, S. Nolte, and A. Tunnermann, "Nonlinear refractive index of fs-laser-written waveguides in fused silica," Opt. Exp., vol. 14, no. 6, pp. 2151-2157, 2006.
42. J. W. Chan, T. Huser, S. Risbud, and D. M. Krol, "Structural changes in fused silica after exposure to focused femtosecond laser pulses," Opt. Lett., vol. 26, no. 21, pp. 1726-1728, 2001.
43. 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, Mater. Sci. Process., vol. 76, no. 3, pp. 367-372, 2003.
44. R. Bruckner, "Properties and structure of vitreous silica. I," J. Non-Cryst. Solids, vol. 5, no. 2, pp. 123-175, 1970.
45. R. Bruckner, "Properties and structure of vitreous silica. II," J. Non-Cryst. Solids, vol. 5, no. 3, pp. 177-216, 1971.
46. U. Haken, O. Humbach, S. Ortner, and H. Fabian, "Refractive index of silica glass: Influence of Active temperature," J. Non-Cryst. Solids, vol. 265, no. 1/2, pp. 9-18, 2000.
47. M. Will, S. Nolte, B. N. Chichkov, and A. Tunnermann, "Optical properties of waveguides fabricated in fused silica by femtosecond laser pulses," Appl. Opt., vol. 4.1, no. 2.1, pp. 4360-4364, 2002.
48. J. W. Chan, T. R. Huser, S. H. Risbud, J. S. Hayden, and D. M. Krol, "Waveguide fabrication in phosphate glasses using femtosecond laser pulses," Appl. Phys. Lett., vol. 82, no. 15, pp. 2371-2373, 2003.
49. S. Nolte, M. Will, J. Burghoff, and A. Tunnermann, "Ultrafast laser processing: New options for three-dimensional photonic structures," J. Modern Opt., vol. 51, no. 16-18, pp. 2533-2542, 2004.
50. 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., vol. 97, no. 8, pp. 083102-1-083102-9, 2005.
51. R. R. Thomson, H. T. Bookey, N. Psaila, S. Campbell, D. T. Reid, S. X. Shen, A. Jha, and A. K. Kar, "Internal gain from an erbium-doped oxyfluoride-silicate glass waveguide fabricated using femtosecond waveguide inscription," IEEE Photon. Technol. Lett., vol. 18, no. 13-16, pp. 1515-1517, Jul. 2006.
52. J. Siegel, J. M. Fernandez-Navarro, A. Garcia-Navarro, V. Diez-Blanco, O. Sanz, J. Solis, F. Vega, and J. Armengol, "Waveguide structures in heavy metal oxide glass written with femtosecond laser pulses above the critical self-focusing threshold," Appl. Phys. Lett., vol. 86, no. 12, pp. 121109-1-121109-3, 2005.
53. A. M. Streltsov and N. F. Borrelli, "Study of femtosecond-laser- written waveguides in glasses," J. Opt. Soc. Amer. B-Opt. Phys., vol. 19, no. 10, pp. 2496-2504, 2002.
54. K. Hirao and K. Miura, "Writing waveguides in silica-related glasses with femtosecond laser," Jpn. J. Appl. Phys. Part 1-Reg. Papers Short Notes Rev. Papers, vol. 37, pp. 49-52, 1998.
55. K. O. Hill and G. Meltz, "Fiber Bragg grating technology fundamentals and overview," J. Lightw. Technol., vol. 15, no. 8, pp. 1263-1276, Aug. 1997.
56. W. J. Reichman, J. W. Chan, C. W. Smelser, S. J. Mihailov, and D. M. Krol, "Spectroscopic characterization of different femtosecond laser modification regimes in fused silica," J. Opt. Soc. Amer. B-Opt. Phys., vol. 24, no. 7, pp. 1627-1632, 2007.
57. L. Sudrie, M. Franco, B. Prade, and A. Mysyrowicz, "Study of damage in fused silica induced by ultra-short IR laser pulses," Opt. Commun., vol. 191, no. 3-6, pp. 333-339, 2001.
58. B. Poumellec and M. Lancry, "Damage thresholds in femtosecond laser processing of silica based materials," in Proc. 1st Int. Workshop Multiphoton Process. Glass Glassy Mater., J. Canning, Ed. Sydney, NSW, Australia, 2006, pp. 91-105.
59. W. J. Reichman, D. M. Krol, L. Shah, F. Yoshino, A. Arai, S. M. Eaton, and P. R. Herman, "A spectroscopic comparison of femtosecond-laser-modified fused silica using kilohertz and megahertz laser systems," J. Appl. Phys., vol. 99, no. 12, pp. 123112-1-123112-5, 2006.
60. A. Pasquarello and R. Car, "Identification of raman defect lines as signatures of ring structures in vitreous silica," Phys. Rev. Lett., vol. 80, no. 23, pp. 5145-5147, 1998.
61. A. Kubota, M. J. Caturla, J. S. Stolken, and M. D. Feit, "Densification of fused silica due to shock waves and its implications for 351 nm laser induced damage," Opt. Exp., vol. 8, no. 11, pp. 611-616, 2001.
62. F. L. Galeener, R. A. Barrio, E. Martinez, and R. J. Elliott, "Vibrational decoupling of rings in amorphous solids," Phys. Rev. Lett., vol. 53, no. 25, pp. 2429-2432, 1984.
63. A. Marcinkevicius, S. Juodkazis, M. Watanabe, M. Miwa, S. Matsuo, H. Misawa, and J. Nishii, "Femtosecond laser-assisted three-dimensional microfabrication in silica," Opt. Lett., vol. 26, no. 5, pp. 277-279, 2001.
64. K. Hirao and K. Miura, "Writing waveguides and gratings in silica and related materials by a femtosecond laser," J. Non-Cryst. Solids, vol. 239, no. 1-3, pp. 91-95, 1998.
65. D. C. Allan, C. Smith, N. F. Borrelli, and T. P. Seward, "193-nm excimer-laser-induced densification of fused silica," Opt. Lett., vol. 21, no. 24, pp. 1960-1962, 1996.
66. Y. Shimotsuma, P. G. Kazansky, J. R. Qiu, and K. Hirao, "Self-organized nanogratings in glass irradiated by ultrashort light pulses," Phys. Rev. Lett., vol. 91, no. 24, pp. 247405-1-247405-4, 2003.
67. C. Hnatovsky, R. S. Taylor, E. Simova, P. P. Rajeev, D. M. Rayner, V. R. Bhardwaj, and P. B. Corkum, "Fabrication of microchannels in glass using focused femtosecond laser radiation and selective chemical etching," Appl. Phys. A, Mater. Sci. Process., vol. 84, no. 1/2, pp. 47-61, 2006.
68. B. Poumellec, L. Sudrie, M. Franco, B. Prade, and A. Mysyrowicz, "Femtosecond laser irradiation stress induced in pure silica," Opt. Exp., vol. 11, no. 9, pp. 1070-1079, 2003.
69. R. S. Taylor, C. Hnatovsky, E. Simova, P. P. Rajeev, D. M. Rayner, and P. B. Corkum, "Femtosecond laser erasing and rewriting of self-organized planar nanocracks in fused silica glass," Opt. Lett., vol. 32, no. 19, pp. 2888-2890, 2007.
70. K. Hirao, Y. Shimotsuma, J. R. Qiu, and K. Miura, "Femtosecond laser induced phenomena in various glasses and their applications," Glass Technol., vol. 46, no. 2, pp. 207-212, 2005.
71. E. N. Glezer and E. Mazur, "Ultrafast-laser driven micro-explosions in transparent materials," Appl. Phys. Lett., vol. 71, no. 7, pp. 882-884, 1997.
72. D. Ashkenasi, G. Muller, A. Rosenfeld, R. Stoian, I. V. Hertel, N. M. Bulgakova, and E. E. B. Campbell, "Fundamentals and advantages of ultrafast micro-structuring of transparent materials," Appl. Phys. A-Mater. Sci. Process., vol. 77, no. 2, pp. 223-228, 2003.
73. J. R. Qiu, K. Miura, and K. Hirao, "Three-dimensional optical memory using glasses as a recording medium through a multi-photon absorption process," Jpn. J. Appl. Phys. Part 1-Reg. Papers Short Notes Rev. Papers, vol. 37, no. 4B, pp. 2263-2266, 1998.
74. C. B. Schaffer, A. O. Jamison, and E. Mazur, "Morphology of femtosecond laser-induced structural changes in bulk transparent materials," Appl. Phys. Lett., vol. 84, no. 9, pp. 1441-1443, 2004.
75. T. Gorelik, M. Will, S. Nolte, A. Tuennermann, and U. Glatzel, "Transmission electron microscopy studies of femtosecond laser induced modifications in quartz," Appl. Phys. A, Mater. Sci. Process., vol. 76, no. 3, pp. 309-311, 2003.
76. A. Horn, E. W. Kreutz, and R. Poprawe, "Ultrafast time-resolved photography of femtosecond laser induced modifications in bk7 glass and fused silica," Appl. Phys. A, Mater. Sci. Process., vol. 79, no. 4, pp. 923-925, 2004.
77. M. Sakakura, M. Terazima, Y. Shimotsuma, K. Miura, and K. Hirao, "Observation of pressure wave generated by focusing a femtosecond laser pulse inside a glass," Opt. Exp., vol. 15, no. 9, pp. 5674-5686, 2007.
78. H. Y. Sun, J. Song, C. B. Li, J. Xu, X. S. Wang, Y. Cheng, Z. Z. Xu, J. R. Qiu, and T. Q. Jia, "Standing electron plasma wave mechanism of void array formation inside glass by femtosecond laser irradiation," Appl. Phys. A, Mater. Sci. Process., vol. 88, no. 2, pp. 285-288, 2007.
79. W. Watanabe, T. Toma, K. Yamada, J. Nishii, K. Hayashi, and K. Itoh, "Optical seizing and merging of voids in silica glass with infrared femtosecond laser pulses," Opt. Lett., vol. 25, no. 22, pp. 1669-1671, 2000.
80. G. D. Marshall, M. Ams, and M. J. Withford, "Direct laser written waveguide-bragg gratings in bulk fused silica," Opt. Lett., vol. 31, no. 18, pp. 2690-2691, 2006.
81. C. Mendez, J. R. V. De Aldana, G. A. Torchia, and L. Roso, "Optical waveguide arrays induced in fused silica by void-like defects using femtosecond laser pulses," Appl. Phys. B-Lasers Opt., vol. 86, no. 2, pp. 343-346, 2007.
82. K. Itoh, W. Watanabe, S. Nolte, and C. B. Schaffer, "Ultrafast processes for bulk modification of transparent materials," MRS Bull., vol. 31, no. 8, pp. 620-625, 2006.
83. M. Ams, G. D. Marshall, D. J. Spence, and M. J. Withford, "Slit beam shaping method for femtosecond laser direct-write fabrication of symmetric waveguides in bulk glasses," Opt. Exp., vol. 13, no. 15, pp. 5676-5681, 2005.
84. S. Ho, P. R. Herman, Y. Cheng, K. Sugioka, and K. Midorikawa, "Direct ultrafast laser writing of buried waveguides in Foturan glass," in Proc. Conf. Lasers Electro-Opt (CLEO), P. R. Herman, Ed., May 2004, vol. 2, pp. 1-3, Paper CThD6.
85. G. D. Marshall, P. Dekker, M. Ams, J. A. Piper, and M. J. Withford, "Monolithic waveguide-laser created using the direct write technique," presented at Bragg Gratings, Photosensitivity Poling Glass Waveguides (BGPP), Quebec, QC, Canada, Sep. 2007, Postdeadline Paper JWBPDP2.
86. I. Mansour and F. Caccavale, "An improved procedure to calculate the refractive index profile from the measured near-field intensity," J. Lightw. Technol., vol. 14, no. 3, pp. 423-428, Mar. 1996.
87. C. B. Schaffer, J. F. Garcia, and E. Mazur, "Bulk heating of transparent materials using a high-repetition-rate femtosecond laser," Appl. Phys. A, Mater. Sci. Process., vol. 76, no. 3, pp. 351-354, 2003.
88. Y. Nasu, M. Kohtoku, and Y. Hibino, "Low-loss waveguides written with a femtosecond laser for flexible interconnection in a planar light-wave circuit," Opt. Lett., vol. 30, no. 7, pp. 723-725, 2005.
89. J. R. Liu, Z. Y. Zhang, C. Flueraru, X. P. Liu, S. D. Chang, and C. P. Grover, "Waveguide shaping and writing in fused silica using a femtosecond laser," IEEE J. Sel. Topics Quantum Electron., vol. 10, no. 1, pp. 169-173, Jan./Feb. 2004.
90. V. Diez-Blanco, J. Siegel, A. Ferrer, A. R. de la Cruz, and J. Solis, "Deep subsurface waveguides with circular cross section produced by femtosecond laser writing," Appl. Phys. Lett., vol. 91, no. 5, pp. 051104-1-051104-3, 2007.
91. 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-Lasers Opt., vol. 87, no. 1, pp. 21-27, 2007.
92. M. Ams, G. D. Marshall, and M. J. Withford, "Study of the influence of femtosecond laser polarisation on direct writing of waveguides," Opt. Exp., vol. 14, no. 26, pp. 13158-13163, 2006.
93. A. H. Nejadmalayeri and P. R. Herman, "Ultrafast laser waveguide writing: Lithium niobate and the role of circular polarization and picosecond pulse width," Opt. Lett., vol. 3.1, no. 20, pp. 2987-2989, 2006.
94. R. Osellame, S. Taccheo, G. Cerullo, M. Marangoni, D. Polli, R. Ramponi, P. Laporta, and S. De Silvestri, "Optical gain in Er-Yb doped waveguides fabricated by femtosecond laser pulses," Electron. Lett., vol. 38, no. 17, pp. 964-965, Aug. 2002.
95. S. Taccheo, G. Della Valle, R. Osellame, G. Cerullo, N. Chiodo, P. Laporta, O. Svelto, A. Killi, U. Morgner, M. Lederer, and D. Kopf, "Er: Yb-doped waveguide laser fabricated by femtosecond laser pulses," Opt. Lett., vol. 29, no. 22, pp. 2626-2628, 2004.
96. 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. Topics Quantum Electron., vol. 12, no. 2, pp. 277-285, Mar./Apr. 2006.
97. H. Kogelnik and C. V. Shank, "Stimulated emission in a periodic structure," Appl. Phys. Lett., vol. 18, no. 4, pp. 152-154, 1971.
98. 3+ codoped fiber distributed-feedback laser," Opt. Lett., vol. 19, no. 24, pp. 2101-2103, 1994.
99. H. B. Zhang, S. M. Eaton, and P. R. Herman, "Single-step writing of Bragg grating waveguides in fused silica with an externally modulated femtosecond fiber laser," Opt. Lett., vol. 32, no. 17, pp. 2559-2561, 2007.
100. G. D. Marshall, P. Dekker, M. Ams, J. A. Piper, and M. J. Withford, "Directly written monolithic waveguide laser incorporating a distributed feedback waveguide-Bragg grating," Opt. Lett., vol. 33, no. 9, pp. 956-958, 2008.