基于環(huán)形濾波鏡的單頻摻鐿光纖激光器研究
[Abstract]:Single-frequency fiber laser is a kind of fiber laser with only one longitudinal mode output in the resonator of optics, so it is also called single-longitudinal-mode fiber laser, because of its high conversion efficiency and good coherence. It is widely used in optical communication, optical fiber sensing, precision measurement and so on due to its simple and compact structure and narrow line width. In this paper, the single frequency optical fiber laser output of 1064 nm is realized by combining the optical fiber ring mirror with saturable absorber to the linear cavity, and then the experimental single frequency laser is used as the seed light to amplify the power. The main work and research contents are as follows: 1. The energy level structure and spectral characteristics of ytterbium-doped fiber are theoretically analyzed. The optimal fiber length and the distribution of power in the linear cavity are calculated. Based on the working principle of fiber annular mirror, the fiber ring filter mirror is formed by combining it with saturable absorber. The filtering principle and working mechanism of ring filter mirror are analyzed theoretically, including the formation mechanism of dynamic grating. The reason why graphene is a saturable absorber in fiber ring mirror and single frequency fiber laser is analyzed. In the experiment, a single frequency fiber laser is realized by applying saturable absorber to the optical fiber ring mirror and placing it in a linear cavity. Ytterbium-doped fiber and graphene are used as saturable absorbers in annular filter mirror respectively. By adjusting two polarization controllers continuously, the stable single-frequency laser output with a central wavelength of 1064 nm is achieved, and the power stability is over 98%. The signal-to-noise ratio (SNR) is 60 dB, in which ytterbium-doped fiber is used as the saturable absorber to obtain the single-frequency laser output with a threshold of 30 mW, with a maximum output power of 32 mW, slope efficiency of 33.8%. Using graphene as a saturable absorber, a single frequency laser output with a threshold of 26 mW, with a maximum output power of 16 mW, slope efficiency of 15% was obtained. The output linewidth of the fiber delay self-heterodyne is measured to be 5 kHz.3.. After the stable single frequency laser output is realized, the output signal is amplified as seed light. The MOPA amplification system is used in the experiment, and the ytterbium-doped fiber with 2mt 5mt 10m is used as the gain medium respectively. Compared with the experiment, it is found that the output power is the best when the length is 5 m, especially when the pump light is up to 300 mW. The gain factor of the single frequency laser is 14.3 dB, and the gain factor of 160mW, is 26.7 times.
【學(xué)位授予單位】:西北大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TN248
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