The inscription of efficient Bragg gratings (> 20 dB) in 12-ring photonic crystal fibre with a germanosilicate doped core without the need for hydrogen loading using 193 nm is demonstrated. We show the characteristic rollover from type I grating to type IIa – the first observation of a type IIa grating in structured optical fibre. The type IIa grating is shown to survive up to 700°C before any degradation in transmission or reflection takes place.
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Cook et al. (2008) studied this question.
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