Single‐wavelength fiber laser for localized temperature monitoring

Abstract

We report on a single-longitudinal-mode singlewavelength fiber laser and its applications for measuring localized temperature variation. The laser was developed using a fiber Bragg grating. The laser wavelength was single-longitudinal-mode with optical signal-to-noise ratio (OSNR) of more than 40 dB. The temperature sensitivity of the system was 11.08 pm/ C. To demonstrate the promising application of the laser sensor developed, we used the sensor to monitor the localized temperature of TiO 2 nanotubes during the photochemical process, and superparamagnetic iron oxides nanoparticles when exposed to low frequency magnetic field. The output of the laser was monitored using a scanning Fabry-Perot spectrum analyzer of resolution 6.7 MHz and an optical spectrum analyzer of resolution 3.75 GHz.

Widely Tunable Fiber Bragg Grating and its Application in Fiber Lasers

“…The applications of most of the lasers reported were limited due to small tuning range, large linewidth, and low output power. A number of techniques have been proposed and demonstrated to achieve widely tunable filters for fiber lasers using a fiber Bragg grating (FBG) . The change in the period of the grating and thus the Bragg wavelength shift was achieved by varying temperature or strain on the FBG.…”