基于开槽型DBR光纤激光器拍频的折射率探测
发布时间：2018-08-06 20:08
【摘要】：提出一种包层开槽型分布布拉格反射光纤激光器,用于光纤激光折射率探测.该激光器以单纵模双偏振分布布拉格反射光纤激光器为核心传感单元,以结构双折射产生的拍频信号为传感信号对折射率进行探测.实验中应用频率编码,灵敏度高且易于解调.利用二氧化碳激光器的热效应对分布布拉格反射光纤激光器的谐振腔加工开槽,通过控制其扫描范围和功率来制备不同宽度和深度的开槽结构,并研究了不同结构参量对灵敏度特性的影响.实验测得最优灵敏度达-240 MHz/RI-unit.此外,还对该结构的温度传感特性做了测试,相较于未刻槽结构,温度灵敏度提高了21%,达1.73 MHz/℃.该装置结构紧凑、稳定性高、制备简单且成本低廉,可用于进一步研究分布布拉格反射光纤激光器的传感和复用特性.
[Abstract]:A laminated slotted distributed Bragg reflective fiber laser is proposed to detect refractive index of fiber laser. The single longitudinal mode dual polarization distributed Bragg reflective fiber laser is used as the core sensing unit and the beat frequency signal generated by structural birefringence is used as the sensing signal to detect the refractive index. Frequency coding is used in the experiment, which has high sensitivity and is easy to demodulate. The cavity of distributed Bragg reflection fiber laser is grooved by the thermal effect of carbon dioxide laser. The slotted structure with different width and depth is fabricated by controlling the scanning range and power of the cavity. The influence of different structural parameters on the sensitivity is also studied. The optimal sensitivity is -240 MHz / RI-unit. In addition, the temperature sensing characteristics of the structure are tested, and the temperature sensitivity of the structure is increased by 21%, reaching 1. 73 MHz/ 鈩，
本文编号：2168855
[Abstract]:A laminated slotted distributed Bragg reflective fiber laser is proposed to detect refractive index of fiber laser. The single longitudinal mode dual polarization distributed Bragg reflective fiber laser is used as the core sensing unit and the beat frequency signal generated by structural birefringence is used as the sensing signal to detect the refractive index. Frequency coding is used in the experiment, which has high sensitivity and is easy to demodulate. The cavity of distributed Bragg reflection fiber laser is grooved by the thermal effect of carbon dioxide laser. The slotted structure with different width and depth is fabricated by controlling the scanning range and power of the cavity. The influence of different structural parameters on the sensitivity is also studied. The optimal sensitivity is -240 MHz / RI-unit. In addition, the temperature sensing characteristics of the structure are tested, and the temperature sensitivity of the structure is increased by 21%, reaching 1. 73 MHz/ 鈩，
本文编号：2168855
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