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Fibre Bragg fabrication in germanosilicate fibres with 244nm femtosecond laser light

Fibre Bragg fabrication in germanosilicate fibres with 244nm femtosecond laser light
Fibre Bragg fabrication in germanosilicate fibres with 244nm femtosecond laser light
The ability to fabricate strong and extraordinarily stable Bragg gratings in any type of fibre using femtosecond laser light has attracted much interest in the recent past. The induced index change has been attributed to glass densification brought about by nonlinear multiphoton ionisation resulting in bond breaking, local melting and rapid cooling occurring after optical breakdown by the high-energy femtosecond light. In this paper, a preliminary comparative study between fibre Bragg grating fabrication in germanosilicate fibre using 244nm femtosecond source with a repetition rate of 250kHz and 200fs pulse duration and a 244nm CW frequency doubled argon-ion source is presented. The reflectivities achieved in both cases were close to identical for similar writing fluences, as were the isochronal annealing profiles. This indicated that despite the very high repetition rate used, the collective heat generated by the femtosecond radiation plays no role in the compaction of the glass matrix. The index change observed in this case is a result of single photon absorption into known defect centres - the laser intensity was insufficient to excite the glass band edge leading to glass compaction. No qualitative difference in index change between CW and short-pulse excitation of these defects is found.
Canagasabey, A.
aa60ded2-2f3f-4795-842a-c12d7b9339b8
Canning, J.
6481aeed-b29e-41ec-bea6-3bfee957a74c
Mills, J.D.
3b139ebc-5875-4367-80e6-f7e94cf2d6a8
Banks, D.P.
134b4e3e-9c17-4155-a3e6-bd16d5f94be4
Ibsen, M.
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Canagasabey, A.
aa60ded2-2f3f-4795-842a-c12d7b9339b8
Canning, J.
6481aeed-b29e-41ec-bea6-3bfee957a74c
Mills, J.D.
3b139ebc-5875-4367-80e6-f7e94cf2d6a8
Banks, D.P.
134b4e3e-9c17-4155-a3e6-bd16d5f94be4
Ibsen, M.
22e58138-5ce9-4bed-87e1-735c91f8f3b9

Canagasabey, A., Canning, J., Mills, J.D., Banks, D.P. and Ibsen, M. (2006) Fibre Bragg fabrication in germanosilicate fibres with 244nm femtosecond laser light. 2nd Pacific International Conference on Application of Lasers and Optics (PICALO) Conference. 03 - 05 Apr 2006. 2 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

The ability to fabricate strong and extraordinarily stable Bragg gratings in any type of fibre using femtosecond laser light has attracted much interest in the recent past. The induced index change has been attributed to glass densification brought about by nonlinear multiphoton ionisation resulting in bond breaking, local melting and rapid cooling occurring after optical breakdown by the high-energy femtosecond light. In this paper, a preliminary comparative study between fibre Bragg grating fabrication in germanosilicate fibre using 244nm femtosecond source with a repetition rate of 250kHz and 200fs pulse duration and a 244nm CW frequency doubled argon-ion source is presented. The reflectivities achieved in both cases were close to identical for similar writing fluences, as were the isochronal annealing profiles. This indicated that despite the very high repetition rate used, the collective heat generated by the femtosecond radiation plays no role in the compaction of the glass matrix. The index change observed in this case is a result of single photon absorption into known defect centres - the laser intensity was insufficient to excite the glass band edge leading to glass compaction. No qualitative difference in index change between CW and short-pulse excitation of these defects is found.

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Published date: April 2006
Venue - Dates: 2nd Pacific International Conference on Application of Lasers and Optics (PICALO) Conference, 2006-04-03 - 2006-04-05

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Local EPrints ID: 47890
URI: https://eprints.soton.ac.uk/id/eprint/47890
PURE UUID: 3ddda600-b64a-4116-8283-f5573abc1de2

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Date deposited: 14 Aug 2007
Last modified: 13 Mar 2019 20:58

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