探测激光超声用的激光外差干涉仪

简述了外差干涉法探测固体表面激光超声的原理和实验结果，讨论了信号光，参考光的准直角对信噪比Ｓ／Ｎ影响和信号光在光束器上的入射角对３外差信号强度的影响，理论和结果表明：当选择入射角时，可以得到约２倍的外差信号强度。为提高检测信号的强度，提出并讨论了外差干涉的共轭输出法。     

Optical heterodyne detected velocity modulation molecular ionic spectroscopy

Optical heterodyne detected velocity modulation molecular ionic spectroscopy is presented and employed to observe the rovibrantional spectra of O2^ and O2^-. That the lineshape of OH-VMS is of the second derivative of Gaussian profile and its sensitivity is 3.5 X 10-s are theoretically analyzed, and they are both in good agreement with our experimental results.     

锁相倍频式高分辨横向塞曼外差干涉仪

阐述了分裂频率约为100kHz的横向塞曼效应激光器及以其为光源的分辨率为10nm的动态式外差干涉仪。仪器应用了国产锁相环器件,采用了专门设计的前馈控制器,使其锁定范围从±15％扩展到±40％,满足了仪器的技术要求。仪器填补了国内高分辨位移动态测量仪的空白。     

高灵敏度分子离子吸收光谱技术及其应用

综述了测量分子离子吸收光谱的速度调制技术的产生背景和发展进程，着重介绍了高灵敏度的光外差磁旋转速度调制光谱技术的实验装置、特点以及应用这项技术的新的研究成果。     

A simple Fourier transform spectrometer for terahertz applications

A simple Fourier transform spectrometer was designed and constructed for the measurement of detectors,sources,passive devices and materials in the terahertz(THz) range.It can be operated at frequencies between 0.3 and 1.5 THz,using a 50-μm-thick Mylar-film beam splitter.The spectral range can be changed by altering the thickness of the beam splitter.The highest frequency resolution is 750 MHz.We studied the properties of heterodyne detectors including superconductor mixers and semiconductor harmonic mixers,direct detectors including an InSb semiconductor bolometer,superconducting tunnel junctions and the Golay cell,and sources including Gunn oscillators and a microwave source with its multipliers,as well as various materials and passive devices including Si wafers and metal mesh filters.     

光外差速度调制分子离子激光光谱

通过求解分子离子在电场中速度分布，获得了小调制度近似下，速度调制分子离子光谱信号强度与调制度成正比、线型为Gauss线型的一次微分线型；理论分析了光外差频率调制光谱的线型亦为Gauss线型的一次微分线型，并分析了该两种光谱技术的优缺点．基于此，提出了光外差速度调制分子离子激光光谱技术，理论分析表明该技术测量获得的谱线线型为Gauss线型的二次微分线型，比纯速度调制测量灵敏度提高大约100倍．它不导致复杂的谱线线型，非常适合进行分子离子的振转光谱测量．     

Measurement of the absorption spectrum of H2O+ in the visible region

Together with the 74 lines belonging to (0,9,0)- (0,0,0) band, the high-resolution absorption spectrum of H₂O⁺ A²A₁-X²B₁ system was observed in the visible region of 16680 — 17300 cm^-1 using optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy for the first time, which verifies the high sensitivity and high signal to noise ratio (S/N) of this technique.     

Optical heterodyne-Zeeman modulation magnetic rotation spectroscopic technique

Optical heterodyne detection using 500 MHz phase modulation was combined with the Zeeman modulation-magnetic rotation spectroscopy (ZM-MRS) to form a new spectroscopic technique, which effectively reduced the amplitude fluctuation from laser source and greatly improved the signal-to-noise ratio in the detection of transient molecules.     

微波光子信号的产生

微波光子信号的产生是微波光子技术的一个基础。着重分析总结了电光调制法、外差法、谐波产生、光电振荡器等实现微波光子信号产生的各种方案,及相关的研究进展并比较了各种方案所产生信号的性能。     

利用激光测量气体微小扩散量的研究

在油压系统中,存在于工作液体中的气泡、压力的变化特别是突然的变化等有时会导致系统不能继续正常地运转,甚至产生破坏.气体与液体之间的扩散是使得液体中的气泡生长及压力变化的主要物理现象.因此有必要研究气体—液体之间的扩散特性.提出了一种使用激光干涉法和U型管相结合,对气体体积的非常微小的变化进行测量的方法.对于气体—液体,气体—液体—橡胶组成的体系的扩散量分别进行了测量.为了验证此种方法的精确程度,推导出了从理论上计算气体扩散的计算方法.测量结果与计算值都能很好地吻合.实验结果上验证了橡胶层的存在对气体的扩散量将会产生一定的影响.