Photonic Crystal Fiber Sensors for Strain and Temperature Measurement
Figure 5
Scanning electron micrographs of PBF cross-sections (a) before and (b) after laser irradiation. (c) Periodic notches created on the surface of the PBF. (d) The transmitted spectrum of LPG with 40 periods and a grating pitch of 430 . (e) Variation of LPG resonant wavelengths with grating pitch (upper panel) and the corresponding transmission spectrums (lower panel) [19].
