提出了基于光强非线性响应的光致热弹光谱光强修正方法，实现了激光光强的准确修正。控制DFB激光器工作于波长调制模式，设置激光调制频率为16 369.75 Hz，通过光纤放大器增强其出射光强非线性项的幅值，光束经多次反射池后汇聚于石英音叉根部激发光热信号，采用数字锁相放大器解调得到对应的谐波信号，通过多项式拟合谐波信号背景，反演得到与浓度及光强分别对应的谐波信号。实验结果表明，当光强从22.03 mW变化至3.16 mW，谐波信号背景幅值与光强具有良好的线性关系，线性相关系数大于0.998，归一化后的谐波信号幅值波动小于0.37%。针对甲烷测量，系统在较大的浓度范围内具有良好的线性响应，谐波信号信噪比表明系统的最低检测限达0.22×10^-6。该研究为光致热弹光谱的光强修正提供了一种新的方法，可有效提高LITES系统在长期测量应用中的稳定性。

Intermodal four-wave mixing (FWM) processes have recently attracted significant interest for all-optical signal processing applications thanks to the possibility to control the propagation properties of waves exciting distinct spatial modes of the same waveguide. This allows, in principle, to place signals in different spectral regions and satisfy the phase matching condition over considerably larger bandwidths compared to intramodal processes. However, the demonstrations reported so far have shown a limited bandwidth and suffered from the lack of on-chip components designed for broadband manipulation of different modes. We demonstrate here a silicon-rich silicon nitride wavelength converter based on Bragg scattering intermodal FWM, which integrates mode conversion, multiplexing and de-multiplexing functionalities on-chip. The system enables wavelength conversion between pump waves and a signal located in different telecommunication bands (separated by 60 nm) with a 3 dB bandwidth exceeding 70 nm, which represents, to our knowledge, the widest bandwidth ever achieved in an intermodal FWM-based system.

对真空紫外光谱辐射计的探测系统、光学系统、真空舱开展了研究和设计，研制了一台轻量化、小型化的高灵敏真空紫外光谱辐射计，并对真空紫外辐射计的光谱范围、中心波长、光谱辐射亮度等性能进行了测试。测试结果表明辐射计光谱范围覆盖了115 nm~200 nm的真空紫外波段，实现了最大响应度分别在121.2 nm、135.6 nm、160 nm、180 nm、200 nm五个工作波长附近，且中心波长的相对示值误差均小于3%，利用定标氘灯测量辐射计在全波段的真空紫外光谱辐射亮度在0.006 4~3.923 9 μW/ cm²·nm·Sr之间，实现了对真空紫外光谱辐射亮度0.01量级以下的测量。