17 February 2017 High-sensitivity sucrose erbium-doped fiber ring laser sensor
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We investigate a high-sensitivity sucrose sensor based on a standard erbium-doped fiber ring laser incorporating a coreless fiber (CF). A single-mode-coreless-single mode (SCS) structure with a very low insertion loss has been constructed. The SCS fiber structure performed dual function as an intracavity fiber filter and/or a sensing element. The gain medium (erbium-doped fiber) is pumped by a 975-nm wavelength fiber coupled diode laser. Laser emission around 1537 nm with 2    dBm peak output power is obtained when a CF in SCS structure has a diameter of 125    μ m . The 3-dB line-width of the laser is < 0.14    nm , which is beneficial to high precision sensing. The sucrose concentration varied from 0% to 60%, and the relationship between the lasing wavelength and the sucrose concentration exhibited linear behavior ( R 2 = 0.996 ), with sensitivity of 0.16 nm/% was obtained. To improve the measurement sensitivity, the CF is etched by hydrofluoric acid. The splice joint of etched CF with SMF is a taper, which improves its sensitivity to sucrose changes. An average sensitivity of 0.57 nm/% and a high signal-to-noise ratio of 50 dB make the proposed sensor suitable for potential applications.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Wurood Abdulkhaleq Khaleel, Wurood Abdulkhaleq Khaleel, Abdul Hadi M. Al-Janabi, Abdul Hadi M. Al-Janabi, } "High-sensitivity sucrose erbium-doped fiber ring laser sensor," Optical Engineering 56(2), 026116 (17 February 2017). https://doi.org/10.1117/1.OE.56.2.026116 . Submission: Received: 4 November 2016; Accepted: 30 January 2017
Received: 4 November 2016; Accepted: 30 January 2017; Published: 17 February 2017

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