Common-path phase-shifting interferometer with binary grating

One Type of Bio-Phase Microscopy Imaging Method Based on a Con Beam with Double Dove Prisms

“…In 2012, Samsheerali [15] reported a coaxial phase-shift digital holographic technology with the help of a diffraction grating phase, which realized the high stability of the quantitative phase imaging. In recent years, other QPI based on the coaxial interference microscopy [16][17][18][19][20][21][22][23][24] have also been put forward, such as the Popescu team [17] successively put forward Fourier Phase Microscopy (FPM) and space optical interference microscopy (SLIM) [20][21][22][23] and the Wax team put forward parallel two-steps phase-shift Microscopy [24], and so on. The research of these techniques have greatly enriched coaxial interference method, make the technology more and more high, but its structure and operation is becoming more and more complicated.…”

Phase-shifting interferometry with four interferograms using linear polarization modulation and a Ronchi grating displaced by only a small unknown amount

“…Modulation of polarization is another useful technique [2]. In grating interferometry, a grating can be transversally displaced by a quarter of a period to obtain shifts of a = 90° [10], for example. But in order to obtain several values, the same number of displacements is required [11][12][13].…”

“…In this communication, a method to reduce the number of captures from n = 2p to p is proposed by means of common-path grating interferometry [10] in conjunction with crossed linear polarization filters for modulation of polarization [14] and grating displacements. A common-path phase-shifting interferometer can be constructed with two-window in the object plane of a 4f Fourier-transform system and a grating as its pupil [15].…”

“…However, a more common Ronchi grating can be used for the case of n = 4 because the diffraction efficiencies for diffraction orders ±1 are sufficiently good enough to display adequate interferograms. Interference of first-neighboring orders can be obtained in the image plane when proper matching conditions are fulfilled and the phase shifting can be performed with grating displacement driven by an actuator [10]. Because several diffraction orders are to be found in the image plane, some additional shifts can be induced by use of linear polarization instead of circular or elliptical polarization.…”

Quantitative phase imaging by common-path interferometric microscopy: application to super-resolved imaging and nanophotonics

“…Thus the instabilities of the system (mechanical or due to thermal changes on both optical paths) do not affect the obtained results. Common-path interferometers had been proposed in many different forms such as the point-diffraction [11], dark-ground filtering [12], phase-contrast [13,14] and luminance contrast method [15], and are applied to visualization of phase disturbances [16][17][18][19], quantitative phase imaging [20][21][22], wavefront and phase aberration sensing [23,24], and superresolution imaging [25][26][27].…”