Deng Jiancheng, Churkin D V, Xu Zuowei, Shu Xuewen
Opt Lett. 2021 Mar 1;46(5):957-960. doi: 10.1364/OL.419115.
A stable single wavelength random fiber laser (RFL) with a partial-reflection random fiber grating (PR-RFG) for high temperature sensing is proposed and demonstrated for the first time, to the best of our knowledge. The PR-RFG is fabricated with the help of a femtosecond laser, with its highest reflection peak significantly higher than all other reflection peaks, which can ensure the stability of this filter-free RFL. Theoretical calculations also show that such a PR-RFG should be designed with reflectivity in the range of ∼30-90 to obtain one reflection peak significantly higher than other peaks. The threshold of this laser is only 6.4 mW. In addition, the RFL realizes temperature sensing in the range from 25°C to 500°C and has an optical signal-to-noise ratio of up to 70 dB.
据我们所知，首次提出并展示了一种用于高温传感的具有部分反射随机光纤光栅（PR-RFG）的稳定单波长随机光纤激光器（RFL）。PR-RFG是在飞秒激光的帮助下制造的，其最高反射峰明显高于所有其他反射峰，这可以确保这种无滤波器RFL的稳定性。理论计算还表明，这种PR-RFG的反射率应设计在约30% - 90%的范围内，以获得一个明显高于其他峰的反射峰。该激光器的阈值仅为6.4 mW。此外，该RFL实现了25°C至500°C范围内的温度传感，光信噪比高达70 dB。
