The present invention relates to an in-band pumping 975-nanomater single-frequency fiber laser with an ytterbium-doped silica optical fiber, comprising a 915-nanometer in-band pumping laser, an optical fiber wavelength division multiplexer, a high-reflectivity optical fiber Bragg grating, an ytterbium-doped silica optical fiber, a low-reflectivity optical fiber Bragg grating and an output optical fiber. The 915-nanometer in-band pumping laser servers as an in-band pumping source. A pumping input port of the optical fiber wavelength division multiplexer is connected to the in-band pumping laser. One end of the high-reflectivity optical fiber Bragg grating is connected to an output port of the optical fiber wavelength division multiplexer, while the other end thereof is connected to one end of the ytterbium-doped silica optical fiber. The low-reflectivity optical fiber Bragg grating is connected to the other end of the ytterbium-doped silica optical fiber. Single-frequency laser light is ultimately output from the output optical fiber connected to the other end of the low-reflectivity optical fiber Bragg grating. The in-band pumping 975-nanomater single-frequency fiber laser with an ytterbium-doped silica optical fiber provided by the present invention has the advantages of simple structure, compact volume, high working stability, convenient manufacturing and the like.
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