Block Defocused Spherical Fabry-Perot Interferometer III: Laser Light Frequency Structure Monitoring For Pulse Holography

In pulse holographic interferometry it is very annoying to find out that hard work done in making interferogram has been spoiled. Posible reasons could be in the arrangement design itself, in the deteriorated or inappropriate photosensitive material or processing, and in laser malfunctioning. In this work the use of a simple device, block defocused spherical Fabry-Perot interferometer (BDSFP), for instant monitoring of the pulsed laser light frequency components as well as for transversal coherence monitoring, and its useful help in holointerferometry is described.