Optimization of recording process in laser irradiance modulated time-average holography of sinusoidally vibrating objects

The beam ratio during modulation of laser irradiance in time-average hologram interferometry of a sinusoidally vibrating object, is discussed for retaining the exposure time, and reducing it if the normal brightness of the higher order J₀ fringes is tolerable. It is assumed that a variable ratio lossless beam splitter is used for the beam division process.