Fabrication and Characterization of Bragg Grating in CYTOP POF at 600-nm Wavelength

Abstract

published 5 xx 201x, current version xx xxx 201x. (Dates will be inserted by IEEE; "published" is the date the accepted preprint is posted on IEEE Xplore ® ; "current version" is the date the typeset version is posted on Xplore ®).

Inscription of Bragg gratings in undoped PMMA mPOF with Nd:YAG laser at 266 nm wavelength

“…Since then, great progress has been made in the POFBG fabrication. Different materials such as TOPAS [9][10][11], ZEONEX [12,13], CYTOP [14][15] or even polycarbonate [16][17] were introduced for different sensing modalities with unique advantages. However, until now, PMMA remains the preferred material for POFs composition.…”

Latest Achievements in Polymer Optical Fiber Gratings: Fabrication and Applications

“…Marques et al [104] reported the inscription of gratings in POFs made of different materials (TOPAS, ZEONEX, and Polycarbonate) under 248 nm wavelength, and compared it with the same fiber irradiation under 325 nm, resulting in a reduction of the irradiation time by at least 16 times (Table 2) and better stability when 248 nm wavelength is employed. Min et al [58] obtained the first 600 nm wavelength grating with commercial CYTOP POF, using a 248 nm KrF laser system with a repetition of 40 Hz and average pulse energy of ~0.60 mJ during ~60 min, as shown in Figure 4, with potential applications in the visible range.…”

“…A Moiré structure is formed by superimposing two gratings of equal amplitude but with slightly different periods. Figure 6a shows the result of two superimposed pulses on a singlemode, BDK-doped mPOF by using a 248 nm KrF laser emitting an output pulse power of 2.5 mJ Min et al [58] obtained the first 600 nm wavelength grating with commercial CYTOP POF, using a 248 nm KrF laser system with a repetition of 40 Hz and average pulse energy of~0.60 mJ during~60 min, as shown in Figure 4, with potential applications in the visible range. Min et al [58] obtained the first 600 nm wavelength grating with commercial CYTOP POF, using a 248 nm KrF laser system with a repetition of 40 Hz and average pulse energy of ~0.60 mJ during ~60 min, as shown in Figure 4, with potential applications in the visible range.…”

“…Last but not least, cyclic transparent fluoropolymers (CYTOP) exhibit excellent transmission characteristics from the visible to near-infrared spectrum, due to the optical absorption wavelength shift to 7.7~10 µm, which exceeds the transmission limit of other polymer materials, such as high-loss PMMA, induced by the high overtone vibration of C-H at 3~3.5 µm. This, therefore, allows Bragg gratings to be inscribed in CYTOP fibers by using a femto-second laser [51][52][53][54][55][56] and phase mask method [57][58][59].…”

“…Reflected spectrum of the FBG in cyclic transparent amorphous fluoropolymers (CYTOP) fiber; image adapted from[58].…”