AlN单晶中的激光调谐

Laser tuning in AlN single crystals

激光波长调谐对于在压力检测、强电场监测、痕量气体探测以及可见光通讯领域中提高动态波长分配效率起着重要作用.拉曼散射是一种具有频移特性的非线性光学效应,这表明拉曼散射可能是一种实现激光波长调谐的可行方法.在本文中,我们发现在特定的测试结构下,氮化铝的A1(TO)模式对应的散射光具有线偏振特性.此外,通过温度调制,我们在氮化铝中实现了高精度的散射光波长调谐.基于实验结果,具有高热导率和高稳定性的氮化铝可能是一种实现激光波长调谐的良好载体.

In the fields of trace gas detection,electric field detection,visible optical communication,and beyond,laser tuning technology plays an increasingly important role,as shown in Fig.S1.Following the miniaturization of optoelectronic devices,it is desirable to integrate a large number of lasers with different wavelengths into one chip[1].However,the dynamic wavelength allocation efficiency of fixedwavelength laser is quite low,which greatly limits the monolithic integration of optoelectronics systems.Therefore,the development of laser wavelength tuning technology is urgent and crucial to the efficiency of optoelectronics[2–7].Raman scattering is a physical phenomenon that can be explained by mature normal form[8,9].However,most studies only pay attention to the fact that Raman spectrum is a non-destructive material characterization method with fingerprint identification characteristics,while its essential feature of inelastic scattering is always ignored[10].The natural frequency shift characteristics indicate the possibility of Raman scattering as a feasible method to realize laser wavelength tuning[11–13].