A micrometric deflection fiber laser sensor controlled by polarized light pumping

Abstract

Abstract This work presents a study of a deflection laser sensor using a pump light source with different polarization states and shows that controlling the polarization state of the pump source can achieve better control in the tuning of an erbium-doped fiber laser. Laser tuning uses a selective wavelength filter manufactured using a thin core fiber section between two single-mode fibers, while the deflection is applied using an angular mechanism. In addition, the sensor was analyzed according to the wavelength shift of the laser emission as a function of the angular micrometric deflection, and a sensitivity of −33.01 pm µrad−1 was obtained in a dynamic range from 0 to 89.3 µrad with an adjustment parameter R 2 = 0.993 61. We achieved dual-wavelength tuning with gradual shifting and single-wavelength tuning from 1531.5 nm to 1547.7 nm. This sensor exhibits potential applications in the bionic and robotic detection fields owing to its high sensitivity, good linearity, simple fabrication, and low cost.