Related Experiment Video
Updated: Jul 2, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Phase measurement using an interferometer having a filamentary spatial filter and an extended source of polychromatic
1Department of Aeronautical Engineering, College of Engineering, University of Osaka Prefecture, Mozu-Umemachi, Sakai 591, Japan.
Abstract:
The theory of phase measurement by means of the interferometer using a filamentary spatial filter (IFSF) is extended to the case in which the source has finite width. Experimental results satisfactorily coincide with theoretically obtained characteristics. The examination of accuracy suggests that the error in phi/2pi can be easily restricted to within 0.01. It is hoped that the IFSF will improve efficiencies in the measurement of dispersive power of a fluid and the method of coincidence being used in the measurement of a distance between reflecting surfaces, because it can simultaneously measure phases in various wavelengths if a polychrometer is set in the rear of the image plane.
Related Concept Videos
Fluorescence and Phosphorescence: Instrumentation
IR Spectrometers
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Interference: Path Lengths
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

