Study On Narrow-linewidth Yb-doped Fiber Laser

Narrow linewidth fiber laser, as a hotspot in research of fiber laser, has received more attention of the researcher. The technology of narrow linewidth fiber laser is more and more mature. The fiber laser is widely used in high precision sensing technologies. The DBR structure fiber laser is a better technical proposal, because it have the advantages of good stability, small size, simple structure and so on.The paper mainly introduce each steps in the experiment of high power narrow linewidth Yb-doped fiber laser, including reseaching beforehand, theory preparation, analogue simulation, purchasing instruments and platform construction. Finally, we have presented a high power laser with more than 0.8W output, narrow linewidth of 21pm Yb-doped double-cladding fiber laser that utilizes two FBGs inscribed directly into the double-cladding fiber core using femtosecond laser pulses. The laser works at 1064nm, which exhibits extremely good stability by temperature control of the FBGs.First, we have researched the transmission theory and fabrication technique, and understood the theory of the FBGs'optical properties. We use the femtosecond laser pulses and the phase mask technique to inscribe FBG successfully.Moreover, we have simulated the design constraints required to achieve single longitudinal mode operation from a standing-wave, homogeneously broadened, fiber laser which utilizes intra-core bragg reflectors for cavity feedback.Finally, A narrow-linewidth laser in all fiber format at 1064 nm is demonstrated. The resonant cavity is composed of two distributed Bragg reflector (DBR) fiber gratings, which were inscribed into the core of the double-cladding fiber by use of 800 nm femtosecond laser pulses and a phase mask. The wavelength and power of the laser featured long term stability.