对974 nm双光纤光栅激光器的温度特性进行理论分析与实验研究,理论模拟了双光纤光栅的栅距对反射率的影响。先在室温(25 ℃)下测试器件的光谱,与未加双光纤光栅器件的光谱相比,双光纤光栅激光器的光谱中的次峰得到明显抑制,测试得到峰值波长(974.07 nm)锁定在光栅的中心波长974 nm附近。对器件的功率电流电压特性进行测试,当工作电流达到400 mA时,尾纤输出功率大于253 mW。再分别测试器件在全温范围下的波长变化率和功率变化率,得到波长变化率小于8.2×10 -3 nm/℃。最后测试器件的微分结构函数曲线并分析热阻分布,通过优化热沉的烧结工艺使器件功率变化率小于1.06%。

In this study, theoretical analysis and experimental investigation of the temperature characteristics of a 974 nm dual-fiber Bragg grating laser are conducted. The effect of grating pitch on reflectivity is theoretically simulated. First, the spectrum of the device is measured at room temperature (25 ℃). Compared with the spectrum of a device without a dual-fiber grating, the secondary peak in the spectrum of the dual-fiber grating laser is significantly suppressed, and the peak wavelength (974.07 nm) of the test laser is locked near the center wavelength of the grating at 974 nm. The power current voltage characteristics characteristics of the device are also measured. When the operating current reaches 400 mA, the output power of the pigtail is greater than 253 mW. Then the wavelength change rate and power change rate of the device at full temperature are analyzed, and it is found that the wavelength change rate is less than 8.2×10 -3 nm/℃. Finally, the differential structure function curve of the device is obtained, and the thermal resistance distribution is analyzed. By optimizing the heat sink sintering process, a device power change rate of less than 1.06% is obtained.