A scanning, all-fiber Sagnac interferometer for high resolution magneto-optic measurements at 820 nm

作者：Fried Alexander^*; Fejer Martin; Kapitulnik Aharon

来源：Review of Scientific Instruments, 2014, 85(10): 103707.

DOI：10.1063/1.4897184

The Sagnac Interferometer has historically been used for detecting non-reciprocal phenomena, such as rotation. We demonstrate an apparatus in which this technique is employed for high resolution measurements of the Magneto-Optical Polar Kerr effect-a direct indicator of magnetism. Previous designs have incorporated free-space components which are bulky and difficult to align. We improve upon this technique by using all fiber-optic coupled components and demonstrate operation at a new wavelength, 820 nm, with which we can achieve better than 1 mu rad resolution. Mounting the system on a piezo-electric scanner allows us to acquire diffraction limited images with 1.5 mu m spatial resolution. We also provide extensive discussion on the details and of the Sagnac Interferometer's construction.

• 出版日期2014-10