By using Yb 3+ -doped double-clad fiber with rectangular inner-cladding, and a set of back-cavity mirrors with different transmission ratio, the double-clad fiber lasers are constructed. It is found that the back-cavity mirror with a higher transmission ratio is better; a back-cavity mirror can control laser wavelength; the relationship between slope efficiency and transmission ratio is in accordance with exponential function, the maximum slope efficiency is about 60%.
The birefringence properties of two types of side-hole fibers have been numerically studied, based on which a Sagnac fiber interferometer employing ethanol-filled side-hole fibers is proposed and experimentally demonstrated for high-sensitive temperature measurement. Thanks to highly temperature-sensitive refractive index of ethanol infiltrated in the air holes of side-hole fibers, high-sensitive temperature measurement could be realized by monitoring fiber-birefringence-induced resonance wavelength shift of the fiber Sagnac interferometer in response to environmental temperature variation. Experimental results show that within a temperature range of 26 C to 54 C, there exists some critical temperature point around 40 C, on both sides of which the resonance dips exhibit inverse temperature-dependent shift behaviors. A temperature sensitivity of 1.10 nm/ C is experimentally achieved for our proposed side-hole fiber Sagnac interferometer.
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