Femtosecond laser based in-fiber long period grating fabrication for improved solution sensing

Farid Ahmed; Md. Shamim Ahsan; Man Seop Lee; Martin B.G. Jun

doi:10.1117/12.2005731

13 March 2013 Femtosecond laser based in-fiber long period grating fabrication for improved solution sensing

Farid Ahmed, Md. Shamim Ahsan, Man Seop Lee, Martin B.G. Jun

Proceedings Volume 8607, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XVIII; 86071L (2013) https://doi.org/10.1117/12.2005731
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

This work reports femtosecond laser based fabrication of long period fiber gratings (LPFG). Index modulation in the core of single mode fiber (SMF) is written employing femtosecond pulse filamentation technique. Highly repeatable filamentary voids written in line-by-line femtosecond laser inscription technique enables steady and noise free growth of LPFGs. The sharp transmission valley (with a narrow full width at half maximum of 5 nm) of long period grating offers better resolution for refractive index (RI) measurement of a solution. The LPFGs inscribed by femtosecond laser radiation show RI sensing sensitivity of 29.199 nm/RIU which is three times higher than the sensitivity of LPFGs written by UV radiation (sensitivity: 11.179 nm/RIU). The position of transmission dip of a grating can be tailored relatively easily simply by varying the period of index modulation.

Citation Download Citation

Farid Ahmed, Md. Shamim Ahsan, Man Seop Lee, and Martin B.G. Jun "Femtosecond laser based in-fiber long period grating fabrication for improved solution sensing", Proc. SPIE 8607, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XVIII, 86071L (13 March 2013); https://doi.org/10.1117/12.2005731

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