Abstract

An image-shearing interferometer of Mach–Zehnder type with corner cubes is introduced for the purpose of measuring spatial coherence at the output of inhomogeneous optical sources, such as multimode fibers (MMFs). One arm of the interferometer is modulated in optical delay to produce dynamic interference fringes. Fringe visibility and the two individual intensities are measured nearly simultaneously to allow direct calculation of the modulus of the complex degree of coherence as a function of the lateral shear between the two interferometer arms. Spatial degree of coherence is measured for a step-index MMF pumped with monochromatic and broadband optical sources.

© 2013 Optical Society of America

Modified Mach–Zehnder interferometer for spatial coherence measurement

F. J. Torcal-Milla, J. Lobera, E. M. Roche, A. M. Lopez, V. Palero, N. Andres, and M. P. Arroyo
Opt. Lett. 48(12) 3127-3130 (2023)

Spatial coherence at the output of multimode optical fibers

Anatoly Efimov
Opt. Express 22(13) 15577-15588 (2014)

Spectrally resolved incoherent holography: 3D spatial and spectral imaging using a Mach–Zehnder radial-shearing interferometer

Dinesh N. Naik, Giancarlo Pedrini, Mitsuo Takeda, and Wolfgang Osten
Opt. Lett. 39(7) 1857-1860 (2014)

White light lateral shear interferometer with holographic shear lenses and spatial Fourier transform

Charles Joenathan, Yanzeng Li, Wanseok Oh, Robert M. Bunch, Ashley Bernal, and Scott R. Kirkpatrick
Opt. Lett. 38(22) 4896-4899 (2013)

Measuring spatial coherence by using a lateral shearing interferometry

Luping Pan, Xingbing Chao, Zhi-Cheng Ren, Hui-Tian Wang, and Jianping Ding
Appl. Opt. 58(1) 56-61 (2019)