Micromachining & FBG fabrication using point by point technique utilizing femto-second laser

Abstract

Fiber bragg gratings (FBG) has wide variety of applications in sensor and laser devices. In this work, we have fabricated FBG using point by point (PbP) technique utilizing fs laser. FBGs spectral characteristics were explored through the variation of grating length, fiber holder position, laser power and coated layer. Fs FBG is fabricated on small mode field diameter fiber which shows enhancement of transmission depth to 2.5 dB. The center wavelength shift is observed from 1520 nm to 1568 nm with the change in translational stage speed. The fs FBGs can be utilized in high pressure sensing, high temperature sensing and hazardous environment monitoring purposes.