Turnaround-Point Long-Period Fiber Gratings (TAP-LPGs) as High-Radiation-Dose Sensors

Author

Kher, Sanjay ; Chaubey, Smita ; Kashyap, Raman ; Oak, Shrikant Madhusudan

Author_Institution

Fiber Opt. Lab., Raja Ramanna Centre for Adv. Technol., Indore, India

Volume

24

Issue

9

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

742

Lastpage

744

Abstract

This letter reports the application of turnaround-point (TAP) long-period gratings (LPGs) for radiation dosimetry. The LPGs were realized using the laser-writing technique. After a gamma dose of 6 kGy, the TAP-LPGs show a radiation-induced shift of more than 35 nm for each of the dual resonance dips, which is the highest shift reported to date for any type of fiber gratings. These LPGs can therefore be used as radiation sensors down to doses of a few Gy with modest wavelength-resolving instrumentation. The LPGs show significant sensitivity of wavelength shifts up to 80 nm for a dose of 65 kGy. We attribute the very high radiation sensitivity to near-TAP operation and doping of Boron in the fiber. This should open up applications of LPGs to radiation dosimetry.

Keywords

boron; diffraction gratings; dosimetry; fibre optic sensors; high radiation dose sensors; laser writing technique; radiation absorbed dose 6 kGy; radiation absorbed dose 65 kGy; radiation dosimetry; turnaround-point long period fiber gratings; wavelength resolving instrumentation; Fiber gratings; Fiber lasers; Optical fiber dispersion; Optical fiber sensors; Optical fibers; Sensitivity; Phase-matching curves (PMC); radiation dose; sensor; turnaround-point long-period gratings (TAP-LPGs);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2187637

Filename

6151807