Shao Lei, Gorman Jason J
Opt Express. 2016 Jul 25;24(15):17459-69. doi: 10.1364/OE.24.017459.
Femtosecond pulsed laser interferometry has important applications in measuring picometer-level displacements on sub-nanosecond time scales. In this paper, we experimentally examine its achievable displacement resolution, as well as the relationship between the laser's optical spectrum and the interferometer's effective wavelength. The resulting broadband displacement noise and noise floor of the pulsed laser Michelson interferometer are equivalent to that achieved with a stabilized continuous wave HeNe laser, where values of 1.01 nm RMS and 27.75 fm/√Hz have been demonstrated. It is also shown that a single effective wavelength can accurately describe the fringes of the pulsed laser interferometer but the effective wavelength value can only be determined from the optical spectrum under certain conditions. These results will be used for time-resolved displacement metrology with picosecond temporal resolution in the future.
飞秒脉冲激光干涉测量技术在亚纳秒时间尺度上测量皮米级位移方面具有重要应用。在本文中，我们通过实验研究了其可实现的位移分辨率，以及激光光谱与干涉仪有效波长之间的关系。脉冲激光迈克尔逊干涉仪产生的宽带位移噪声和本底噪声与稳定的连续波氦氖激光所达到的相当，已证明其均方根值为1.01 nm，噪声基底为27.75 fm/√Hz。研究还表明，单一有效波长可以准确描述脉冲激光干涉仪的条纹，但有效波长值只能在特定条件下根据光谱来确定。这些结果将用于未来具有皮秒时间分辨率的时间分辨位移计量。
