Fiber bragg gratings: Advances in fabrication process and tools

Fiber Bragg Grating Sensors: Recent Advancements, Industrial Applications and Market Exploitation

Volumn , Issue , 2011, Pages 9-34

  Sugden, Kate ^a   Mezentsev, Vladimir ^a  

^a ASTON UNIVERSITY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 84877912010     PISSN: None     EISSN: None     Source Type: Book    
DOI: 10.2174/978160805084011101010009     Document Type: Chapter

References (123)

1. Hill KO, Fujii Y, Johnson DC, Kawasaki BS. Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication. Appl. Phys. Lett. 1978; 32(10): 647-9.
2. Kawasaki BS, Hill KO, Johnson DC, Fujii Y. Narrow-band Bragg reflectors in optical fibers. Opt. Lett. 1978; 3(2): 66-8.
3. Bennion I, Reid DCJ, Rowe CJ, Stewart WJ. High-reflectivity monomode-fiber grating filters. Electron. Lett. 1986; 22(6): 341-3.
4. Meltz G, Morey WW, Glenn WH. Formation of Bragg gratings in optical fibers by a transverse holographic method. Opt. Lett. 1989; 14(15): 823-5.
5. Anderson DZ, Mizrahi V, Erdogan T, White AE. Phase-mask method for volume manufacturing of fiber phase gratings. Proc. of Conf. on Optical Fiber Communication/International Conf. on Integrated Optics and Optical Fiber Communication 1993; Paper PD16.
6. Hill KO, Malo B, Bilodeau F, Johnson DC, Albert J. Bragg gratings fabricated in monomode photosensitive optical fiber by UV exposure through a phase mask. Appl. Phys. Lett. 1993; 62(10): 1035-7.
7. Chen X. Advanced Optical Fibre Gratings and Applications. PhD Thesis in Electronic Engineering. Birmingham: Aston University; 2006.
8. Lam DKW, Garside BK. Characterization of single-mode optical fiber filters. Appl. Opt. 1981; 20(3): 440-5.
9. Hosono H, Abe Y, Kinser DL, Weeks RA, Muta K, Kawazoe H. Nature and origin of the 5-eV band in SiO2-GeO2 glasses. Phys. Rev. B 1992; 46(18): 11445-51.
10. Nishii J, Fukumi K, Yamanaka H, Kawamura KI, Hosono H, Kawazoe H. Photochemical reactions in GeO2-SiO2 glasses induced by ultraviolet-irradiation: Comparison between Hg lamp and excimer laser. Phys. Rev. B 1995; 52(3): 1661-5.
11. Russell PS, Poyntz-Wright LJ, Hand DP. Frequency doubling, absorption, and grating formation in glass-fibers: Effective defects or defective effects?. Proc. of SPIE 1991; 1373: 126-39.
12. Lemaire PJ, Atkins RM, Mizrahi V, Reed WA. High-pressure H2 loading as a technique for achieving ultrahigh UV photosensitivity and thermal sensitivity in GeO2 doped optical fibres. Electron. Lett. 1993; 29(13): 1191-3.
13. Canning J. Fibre gratings and devices for sensors and lasers. Laser Photon. Rev. 2008; 2(4): 275-89.
14. Simpson AG. Optical Fibre Sensors and Their Interrogation. PhD Thesis in Electronic Engineering. Birmingham: Aston University; 2005.
15. Wong D, Poole SD, Sceats MG. Stress relief: Proof of the mechanism of photo-induced index change. Proc. of International Conf. Integrated Photonics Research (IPR) 1992; Paper PD16.
16. Erdogan T, Mizrahi V, Lemaire PJ, Monroe D. Decay of ultraviolet-induced fiber Bragg gratings. J. Appl. Phys. 1994; 76(1): 73-80.
17. Fokine M, Margulis W. Large increase in photosensitivity through massive hydroxyl formation. Opt. Lett. 2000; 25(5): 302-4.
18. Liu Y, Williams JAR, Zhang L, Bennion I. Abnormal spectral evolution of fiber Bragg gratings in hydrogenated fibers. Opt. Lett. 2002; 27(8): 586-8.
19. Canning J, Deyerl HJ, Sørensen HR, Kristensen M. Ultraviolet-induced birefringence in hydrogen-loaded optical fiber. J. Appl. Phys. 2005; 97(5): 053104.
20. Shu XW, Liu Y, Zhao DH, Gwandu B, Floreani F, Zhang L, Bennion I. Dependence of temperature and strain coefficients on fiber grating type and its application to simultaneous temperature and strain measurement. Opt. Lett. 2002; 27(9): 701-3.
21. Shu XW, Zhao DH, Zhang L, Bennion I. Use of dual-grating sensors formed by different types of fiber Bragg gratings for simultaneous temperature and strain measurements. Appl. Opt. 2004; 43(10): 2006-12.
22. Niay P, Bernage P, Douay M, Tauney T, Xie WX, Martenelli G, Bayon J, Poignant H, Delevaque E. Bragg grating photoinscription within various types of fibers and glasses. Proc. of Topical Meeting on Photosensitivity and Quadratic Nonlinearity in Glass Waveguides: Fundamentals and Applications 1995; 66-9.
23. Xie WX, Niay P, Bernage P, Douay M, Bayon JF, Georges T, Monerie M, Poumellec B. Experimental evidence of two types of photorefractive effects occurring during photoinscriptions of Bragg gratings within germanosilicate fibres. Opt. Commun. 1993; 104(1-3): 185-95.
24. Riant I, Haller F. Study of the photosensitivity at 193 nm and comparison with photosensitivity at 240 nm influence of fiber tension: Type IIa aging. J. Lightwave Technol. 1997; 15(8): 1464-9.
25. Dong L, Liu WF, Reekie L. Negative-index gratings formed by a 193-nm excimer laser. Opt. Lett. 1996; 21(24): 2032-4.
26. Canagasabey A, Canning J. UV lamp hypersensitisation of hydrogen-loaded optical fibres. Opt. Express 2003; 11(13): 1585-9.
27. Ashton B, Stevenson M, Canning J. Solar hypersensitization of optical fibers. Opt. Lett. 2007; 32(6): 608-10.
28. Lancry M, Poumellec B, Beugin V, Niay P, Douay M, Depecker C, Cordier P. Mechanisms of photosensitivity enhancement in OH-flooded standard germanosilicate preform plates. J. Non-Cryst. Solids 2007; 353(1): 69-76.
29. Sørensen HR, Canning J, Kristensen M. Thermal hypersensitisation and grating evolution in Ge-doped optical fibre. Opt. Express 2005; 13(7): 2276-81.
30. Baker SR, Rourke HN, Baker V, Goodchil D. Thermal decay of fiber Bragg gratings written in boron and germanium codoped silica fiber:. J. Lightwave Technol. 1997; 15(8): 1470-7.
31. Albert J, Fokine M, Margulis W. Grating formation in pure silica-core fibers. Opt. Lett. 2002; 27(10): 809-11.
32. Archambault JL, Reekie L, Russell PSJ. 100 percent reflectivity Bragg reflectors produced in optical fibres by single excimer laser pulses. Electron. Lett. 1993; 29(5): 453-5.
33. Canning J, Bandyopadhyay S, Stevenson M, Cook K. Fiber Bragg grating sensor for high temperature application. Proc. of Joint Conf. of Opto-Electronics and Communications Conf. and Australian Conf. on Optical Fibre Technology 2008; 2 pages.
34. Zhang B, Kahrizi M. High-temperature resistance fiber Bragg grating temperature sensor fabrication. IEEE Sensors J. 2007; 7(4): 586-91.
35. Williams DL, Ainslie BJ, Armitage JR, Kashyap R, Campbell R. Enhanced UV photosensitivity in boron codoped germanosilicate fibres. Electron. Lett. 1993; 29(1): 45-7.
36. Chisholm KE. Fabrication and Application of Short and Novel Structure In-Fibre Bragg Gratings. PhD Thesis in Electronic Engineering. Birmingham: Aston University; 2000.
37. Dianov EM, Golant KM, Mashinsky VM, Medvedkov OI, Nikolin IV, Sazhin OD, Vasiliev SA. Highly photosensitive nitrogen-doped germanosilicate fibre for index grating writing. Electron. Lett. 1997; 33(15): 1334-6.
38. Dianov EM, Golant KM, Khrapko RR, Kurkov AS, Leconte B, Douay M, Bernage P, Niay P. Grating formation in a germanium free silicon oxynitride fibre. Electron. Lett. 1997; 33(3): 236-8.
39. Malo B, Albert J, Bilodeau F, Katagawa T, Johnson DC, Hill KO, Hattori K, Hibino Y, Gujrathi S. Photosensitivity in phosphorus-doped silica glass and optical waveguides. Appl. Phys. Lett. 1994; 65(4): 394-6.
40. Ball GA, Morey WW, Waters JP. Nd3+ fibre laser utilising intra-core Bragg reflectors. Electron. Lett. 1990; 26(21): 1829-30.
41. Dong L, Archambault JL, Reekie L, Russell PSJ, Payne DN. Bragg gratings in Ce3+-doped fibers written by a single excimer pulse. Opt. Lett. 1993; 18(11): 861-3.
42. Meltz G, Morey WW. Bragg grating formation and germanosilicate fiber photosensitivity. Proc. of SPIE 1992; 1516: 185-99.
43. http://www.draka.com/draka/DrakaComteq/Drakafibre/Languages/English/Navigation/Markets%26Products/Single_mode /BendBright/index.html
44. Hermann PR, Beckley K, Ness S. 157-nm photosensitivity in germanosilicate waveguides. Proc. of Topical Meeting on Photosensitivity and Poling in Glass Fibers and Waveguides: Applications and Fundamentals 1997; 154.
45. Albert J, Malo B, Bilodeau F, Johnson DC, Hill KO, Hibino Y, Kawachi M. Photosensitivity in Ge-doped silica optical waveguides and fibers with 193-nm light from an ArF excimer laser. Opt. Lett. 1994; 19(6): 387-9.
46. Askins CG, Tsai TE, Williams GM, Putnam MA, Bashkansky M, Friebele EJ. Fiber Bragg reflectors prepared by a single excimer pulse. Opt. Lett. 1992; 17(11): 833-5.
47. Dyer PE, Farley RJ, Giedl R, Byron KC, Reid D. High reflectivity fibre gratings produced by incubated damage using a 193 nm ArF laser. Electron. Lett. 1994; 30(11): 860-2.
48. Patrick H, Gilbert SL. Growth of Bragg gratings produced by continuous-wave ultraviolet light in optical fiber. Opt. Lett. 1993; 18(18): 1484-6.
49. Illy EK, Booth HJ. Comparison of fibre Bragg grating writing at multiple UV wavelengths. Proc. of XXVIII European Conf. on Optical Communications 2002; Paper M602.
50. Chisholm KE, Sugden K, Bennion I. Effects of thermal annealing on Bragg fibre gratings in boron/germania co-doped fibre. J. Phys. D: Appl. Phys. 1998; 31(1): 61-4.
51. Atkins RM, Espindola RP. Photosensitivity and grating writing in hydrogen loaded germanosilicate core optical fibers at 325 and 351 nm. Appl. Phys. Lett. 1997; 70(9): 1068-9.
52. Dobb HL. Fibre Gratings in Novel Optical Fibres for Applications in Sensing. PhD Thesis in Electronic Engineering. Birmingham: Aston University; 2007.
53. Starodubov DS, Grubsky V, Feinberg J, Kobrin B, Juma S. Bragg grating fabrication in germanosilicate fibers by use of near-UV light: A new pathway for refractive-index changes. Opt. Lett. 1997; 22(14): 1086-8.
54. Blows J, Tang DY. Gratings written with tripled output of Q-switched Nd:YAG laser. Electron. Lett. 2000; 36(22): 1837-9.
55. Kashyap R, Armitage JR, Campbell RJ, Williams DL, Maxwell GD, Ainslie BJ, Millar CA. Light-sensitive optical fibres and planar waveguides: Advances in optical technology. BT Technol. J. 1993; 11(2): 150-60.
56. Eggleton BJ, Krug PA, Poladian L, Ahmed KA, Liu HF. Experimental demonstration of compression of dispersed optical pulses by reflection from self-chirped optical fiber Bragg gratings. Opt. Lett. 1994; 19(12): 877-9.
57. Zhang Q, Brown DA, Reinhart L, Morse TF. Simple prism-based scheme for fabricating Bragg gratings in optical fibers. Opt. Lett. 1994; 19(23): 2030-2.
58. Farries MC, Sugden K, Reid DCJ, Bennion I, Molony A, Goodwin MJ. Very broad reflection bandwidth (44 nm) chirped fibre gratings and narrow bandpass filters produced by the use of an amplitude mask. Electron. Lett. 1994; 30(11): 891-2.
59. Sugden K, Bennion I, Molony A, Copner NJ. Chirped gratings produced in photosensitive optical fibres by fibre deformation during exposure. Electron. Lett. 1994; 30(5): 440-2.
60. Dong L, Cruz JL, Reekie L, Tucknott JA. Fabrication of chirped fibre gratings using etched tapers. Electron. Lett. 1995; 31(11): 908-9.
61. Byron IC, Rourke HN. Fabrication of chirped fibre gratings by novel stretch and write technique. Electron. Lett. 1995; 31(1): 60-1.
62. Okude S, Sakai T, Wada A, Yamauchi R. Novel chirped fiber grating utilizing a thermally diffused taper-core fiber. Proc. of Optical Fiber Communication (OFC) Conf. 1996; 88-9.
63. Legoubin S, Fertein E, Douay M, Bernage P, Niay P, Bayon F, Georges T. Formation of moire grating in core of germanosilicate fibre by transverse holographic double exposure method. Electron. Lett. 1991; 27(21): 1945-7.
64. Matsuhara M, Hill KO. Optical-waveguide band-rejection filters: Design. Appl. Opt. 1974; 13(12): 2886-8.
65. Albert J, Hill KO, Johnson DC, Bilodeau F, Rooks MJ. Moire phase masks for automatic pure apodisation of fibre Bragg gratings. Electron. Lett. 1996; 32(24): 2260-1.
66. Dix C, Mckee PF. High accuracy electron-beam grating lithography for optical and optoelectronic devices. J. Vac. Sci. Technol. B 1992; 10(6): 2667-70.
67. Swanton A, Armes DJ, Young-Smith KJ, Dix C, Kashyap R. Use of e-beam written, reactive ion etched, phase masks for the generation of novel photorefractive fibre gratings. Microelectron. Eng. 1996; 30(1-4): 509-12.
68. Curran JE. Production of surface patterns by chemical and plasma etching. J. Phys. E: Sci. Instrum. 1981; 14(4): 393-407.
69. Smith GN, Kalli K, Bennion I, Sugden K. Demonstration of inscription and ablation of phase masks for the production of 1st, 2nd, and 3rd order FBG gratings using a femtosecond laser. Proc. of SPIE 2009; 7205: Paper 720511.
70. Anderson DZ, Mizrahi V, Erdogan T, White AE. Production of in-fibre gratings using a diffractive optical element. Electron. Lett. 1993; 29(6): 566-8.
71. Loh WH, Cole MJ, Zervas MN, Barcelos S, Laming RI. Complex grating structures with uniform phase masks based on the moving fiber-scanning beam technique. Opt. Lett. 1995; 20(20): 2051-3.
72. Dyer PE, Farley RJ, Giedl R. Analysis of grating formation with excimer laser irradiated phase masks. Opt. Commun. 1995; 115(3-4): 327-34.
73. Albert J, Theriault S, Bilodeau F, Johnson DC, Hill KO, Sixt P, Rooks MJ. Minimization of phase errors in long fiber Bragg grating phase masks made using electron beam lithography. IEEE Photon. Technol. Lett. 1996; 8(10): 1334-6.
74. Albert J, Hill KO, Malo B, Theriault S, Bilodeau F, Johnson DC, Erickson LE. Apodisation of the spectral response of fibre Bragg gratings using a phase mask with variable diffraction efficiency. Electron. Lett. 1995; 31(3): 222-3.
75. Pakulski G, Moore R, Maritan C, Shepherd F, Fallahi M, Templeton I, Champion G. Fused silica masks for printing uniform and phase adjusted gratings for distributed feedback lasers. Appl. Phys. Lett. 1993; 62(3): 222-4.
76. Lefebvre P. Apparatus for Generating an Optical Interference Pattern. US Patent 7079729; filed October 31, 2005.
77. Emmerson GD, Watts SP, Gawith CBE, Albanis V, Ibsen M, Williams RB, Smith PGR. Fabrication of directly UVwritten channel waveguides with simultaneously defined integral Bragg gratings. Electron. Lett. 2002; 38(24): 1531-2.
78. http://www.fbgs-technologies.com/
79. Mihailov SJ, Gower MC. Recording of efficient high-order Bragg reflectors in optical fibres by mask image projection and single pulse exposure with an excimer laser. Electron. Lett. 1994; 30(9): 707-9.
80. Askins CG, Putnam MA, Williams GM, Friebele EJ. Stepped-wavelength optical-fiber Bragg grating arrays fabricated in line on a draw tower. Opt. Lett. 1994; 19(2): 147-9.
81. Rothhardt MW, Chojetzki C, Mueller HR. High-mechanical-strength single-pulse draw tower gratings. Proc. of SPIE 2004; 5579: 127-35.
82. Chojetzki C, Rothhardt M, Ommer J, Unger S, Schuster K, Mueller HR. High-reflectivity draw-tower fiber Bragg gratings - Arrays and single gratings of type II. Opt. Eng. 2005; 44(6): 060503.
83. Bartelt H, Schuster K, Unger S, Chojetzki C, Rothhardt M, Latka I. Single-pulse fiber Bragg gratings and specific coatings for use at elevated temperatures. Appl. Opt. 2007; 46(17): 3417-24.
84. Starodubov DS, Grubsky V, Feinberg J. Efficient Bragg grating fabrication in a fibre through its polymer jacket using near-UV light. Electron. Lett. 1997; 33(15): 1331-3.
85. Bennion I, Mezentsev V, Dubov M, Nikogosyan DN, Petrovic J, Lai Y, Smith G, Zhou K, Sugden K. Device fabrication by femtosecond laser inscription. Proc. of International Conf. on Bragg Gratings Photosensitivity, and Poling in Glass Waveguides 2007; Paper BWB6.
86. Davis KM, Miura K, Sugimoto N, Hirao K. Writing waveguides in glass with a femtosecond laser. Opt. Lett. 1996; 21(21): 1729-31.
87. Kondo Y, Nouchi K, Mitsuyu T, Watanabe M, Kazansky PG, Hirao K. Fabrication of long-period fiber gratings by focused irradiation of infrared femtosecond laser pulses. Opt. Lett. 1999; 24(10): 646-8.
88. Ams M, Marshall GD, Dekker P, Dubov M, Mezentsev VK, Bennion I, Withford MJ. Investigation of ultrafast laserphotonic material interactions: Challenges for directly written glass photonics. IEEE J. Sel. Top. Quantum Electron. 2008; 14(5): 1370-81.
89. Feng Q, Moloney JV, Newell AC, Wright EM, Cook K, Kennedy PK, Hammer DX, Rockwell BA, Thompson CR. Theory and simulation on the threshold of water breakdown induced by focused ultrashort laser pulses. IEEE J. Quantum Electron. 1997; 33(2): 127-37.
90. Mezentsev V, Petrovic JS, Dubov M, Bennion I, Dreher J, Schmitz H, Grauer R. Femtosecond laser microfabrication of subwavelength structures in photonics. Proc. of SPIE 2007; 6459: Paper 64590B.
91. Berge L, Skupin S, Nuter R, Kasparian J, Wolf JP. Ultrashort filaments of light in weakly ionized, optically transparent media. Rep. Prog. Phys. 2007; 70(10): 1633-713.
92. Okhrimchuk AG, Mezentsev VK, Schmitz H, Dubov M, Bennion I. Cascaded nonlinear absorption of femtosecond laser pulses in dielectrics. Laser Phys. 2009; 19(7): 1415-22.
93. Turitsyn SK, Mezentsev VK, Dubov M, Rubenchik AM, Fedoruk MP, Podivilov EV. Sub-critical regime of femtosecond inscription. Opt. Express 2007; 15(22): 14750-64.
94. Dubov M, Mezentsev V, Bennion I, Nikogosyan DN. UV femtosecond laser inscribes a 300 nm period nanostructure in a pure fused silica. Meas. Sci. Technol. 2007; 18(7): L15-7.
95. Zagorul'ko KA, Kryukov PG, Dianov EM, Dragomir A, Nikogosyan DN. Fibre-Bragg-grating writing in single-mode optical fibres by UV femtosecond pulses. Quantum Electron. 2003; 33(8): 728-30.
96. Zagorulko KA, Kryukov PG, Larionov YV, Rybaltovsky AA, Dianov EM. Fabrication of fiber Bragg gratings with 267 nm femtosecond radiation. Opt. Express 2004; 12(24): 5996-6001.
97. Martinez A, Dubov M, Khrushchev I, Bennion I. Direct writing of fibre Bragg gratings by femtosecond laser. Electron. Lett. 2004; 40(19): 1170-2.
98. Wikszak E, Burghoff J, Will M, Nolte S, Tuennermann A, Gabler T. Recording of fiber Bragg gratings with femtosecond pulses using a "point by point" technique. Proc. of Conf. on Lasers and Electro-Optics 2004; Volume 2: Paper CThM7.
99. Martinez A, Khrushchev IY, Bennion I. Thermal properties of fibre Bragg gratings inscribed point-by-point by infrared femtosecond laser. Electron. Lett. 2005; 41(4): 176-8.
100. Allsop T, Dubov M, Martinez A, Floreani F, Khrushchev I, Webb DJ, Bennion I. Long period grating directional bend sensor based on asymmetric index modification of cladding. Electron. Lett. 2005; 41(2): 59-60.
101. Allsop T, Dubov M, Martinez A, Floreani F, Khrushchev I, Webb DJ, Bennion I. Bending characteristics of fiber longperiod gratings with cladding index modified by femtosecond laser. J. Lightwave Technol. 2006; 24(8): 3147-54.
102. Jovanovic N, Fuerbach A, Marshall GD, Withford MJ, Jackson SD. Stable high-power continuous-wave Yb3+-doped silica fiber laser utilizing a point-by-point inscribed fiber Bragg grating. Opt. Lett. 2007; 32(11): 1486-8.
103. Lai Y, Zhou K, Sugden K, Bennion I. Point-by-point inscription of first-order fiber Bragg grating for C-band applications. Opt. Express 2007; 15(26): 18318-25.
104. Martinez A, Dubov M, Khrushchev I, Bennion I. Photoinduced modifications in fiber gratings inscribed directly by infrared femtosecond irradiation. IEEE Photon. Technol. Lett. 2006; 18(21-24): 2266-8.
105. Martinez A, Khrushchev IY, Bennion I. Direct inscription of Bragg gratings in coated fibers by an infrared femtosecond laser. Opt. Lett. 2006; 31(11): 1603-5.
106. Dubov M, Mezentsev V, Bennion I. Femtosecond inscription of the first order Bragg gratings in pure fused silica. Proc. of IX NSTI Nanotechnology Conf. and Trade Show (Nanotech) 2006; Paper TU34.02.
107. Smelser CW, Mihailov SJ, Grobnic D. Formation of Type I-IR and Type II-IR gratings with an ultrafast IR laser and a phase mask. Opt. Express 2005; 13(14): 5377-86.
108. Nikogosyan DN. Multi-photon high-excitation-energy approach to fibre grating inscription. Meas. Sci. Technol. 2007; 18(1): R1-29.
109. Wang DL, Li CD, Luo L, Yang H, Gong QH. Sub-diffraction-limit voids in bulk quartz induced by femtosecond laser pulses. Chin. Phys. Lett. 2001; 18(1): 65-7.
110. Nikogosyan DN, Dubov M, Schmitz H, Mezentsev V, Bennion I, Bolger P, Zayats AV. Point-by-point inscription of 250-nm-period structure in bulk fused silica by tightly-focused femtosecond UV pulses: Experiment and numerical modeling. Cent. Eur. J. Phys.; published online March 21, 2009.
111. Mihailov SJ, Smelser CW, Grobnic D, Walker RB, Lu P, Ding H, Unruh J. Bragg gratings written in all-SiO2 and Gedoped core fibers with 800-nm femtosecond radiation and a phase mask. J. Lightwave Technol. 2004; 22(1): 94-100.
112. Mihailov SJ, Smelser CW, Lu P, Walker RB, Grobnic D, Ding H, Henderson G, Unruh J. Fiber Bragg gratings made with a phase mask and 800-nm femtosecond radiation. Opt. Lett. 2003; 28(12): 995-7.
113. Livitziis M, Pissadakis S. Bragg grating recording in low-defect optical fibers using ultraviolet femtosecond radiation and a double-phase mask interferometer. Opt. Lett. 2008; 33(13): 1449-51.
114. Zhou K, Lai Y, Chen X, Sugden K, Zhang L, Bennion I. A refractometer based on a micro-slot in a fiber Bragg grating formed by chemically assisted femtosecond laser processing. Opt. Express 2007; 15(24): 15848-53.
115. Petrovic J, Lai Y, Bennion I. Numerical and experimental study of microfluidic devices in step-index optical fibers. Appl. Opt. 2008; 47(10): 1410-6.
116. Canagasabey A, Canning J, Mills JD, Banks DP, Ibsen M. Fibre Bragg grating fabrication in germanosilicate fibres with 244nm femtosecond laser light. Proc. of II Pacific International Conf. on Application of Lasers and Optics 2006.
117. Marshall GD, Withford MJ. Annealing properties of femtosecond laser inscribed point-by-point fiber Bragg gratings. Proc. of International Conf. on Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides 2007; Paper JWA30.
118. Reichman WJ, Chan JW, Smelser CW, Mihailov SJ, Krol DM. Spectroscopic characterization of different femtosecond laser modification regimes in fused silica. J. Opt. Soc. Am. B: Opt. Phys. 2007; 24(7): 1627-32.
119. Lai Y, Martinez A, Khrushchev I, Bennion I. Distributed Bragg reflector fiber laser fabricated by femtosecond laser inscription. Opt. Lett. 2006; 31(11): 1672-4.
120. Wikszak E, Thomas J, Burghoff J, Ortac B, Limpert J, Nolte S, Fuchs U, Tunnermann A. Erbium fiber laser based on intracore femtosecond-written fiber Bragg grating. Opt. Lett. 2006; 31(16): 2390-2.
121. Zhan C, Lee J, Yin S, Ruffin P, Grant J. Photoenhanced polarization mode separated fiber Bragg gratings inscribed by femtosecond laser. J. Appl. Phys. 2007; 101(5): 053110.
122. Zhan C, Zhu Y, Yin S, Ruffin P. Multi-parameter harsh environment sensing using asymmetric Bragg gratings inscribed by IR femtosecond irradiation. Opt. Fiber Technol. 2007; 13(2): 98-107.
123. Dubov M, Allsop T, Martinez A, Mezentsev V, Bennion I. Highly birefringent long period gratings fabricated with femtosecond laser. Proc. of Optical Fiber Communication Conf. 2006; Paper OWI50.