Temperature and refractive index measurements using long-period fiber gratings fabricated by femtosecond laser

Yongqin Yu; Jiarong Zheng; Kai Yi; Shuangchen Ruan; Chenlin Du; Jianhui Huang; Wansheng Zhong

doi:10.1117/12.904386

29 November 2011 Temperature and refractive index measurements using long-period fiber gratings fabricated by femtosecond laser

Yongqin Yu, Jiarong Zheng, Kai Yi, Shuangchen Ruan, Chenlin Du, Jianhui Huang, Wansheng Zhong

Author Affiliations +

Proceedings Volume 8307, Passive Components and Fiber-Based Devices VIII; 83071W (2011) https://doi.org/10.1117/12.904386
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

Abstract

Long period fiber gratings (LPFGs) with different periods in the standard single mode fiber were fabricated, using laser direct writing method, by femtosecond laser pulses with pulse width of 200 fs and the repetition rate of 250 kHz at a center wavelength of 800 nm in air. Comparative with bare LPFG in temperature sensor, LPFG had been encapsulated using large coefficient of thermal expansion of epoxy polymer and Aluminum to enhance the temperature sensitivity. The results showed that the temperature sensitivity of encapsulated LPFG was 2 times than that of bare LPFG. In addition, we also researched the relationship between resonant wavelength and surrounding refractive index (SRI) when LPFG immersed in refractive index of solution of different index at 20 degree Celsius.

Citation Download Citation

Yongqin Yu, Jiarong Zheng, Kai Yi, Shuangchen Ruan, Chenlin Du, Jianhui Huang, and Wansheng Zhong "Temperature and refractive index measurements using long-period fiber gratings fabricated by femtosecond laser", Proc. SPIE 8307, Passive Components and Fiber-Based Devices VIII, 83071W (29 November 2011); https://doi.org/10.1117/12.904386

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