Speckle Imaging Using Aperture Modulation

This book is about how speckle images form when the aperture is modulated in different ways. Its main thread is theoretical: for each aperture, the author calculates the impulse response, or Point Spread Function (PSF), which shows what resolution the resulting speckle images can reach.

It opens by looking at how the orientation of new apertures can be recognized from elongated speckle images, and this sets up the later chapters. The analysis then moves through a range of designs, including Gaussian, graded-index and other modulated apertures. The book also examines how contrast behaves in speckle images, covering the Voigt distribution and the way modulation changes contrast.

Beyond apertures themselves, the book deals with processing the speckle images once they are formed. Topics include discrimination in microscopy with digital speckle images, concentric hexagonal pupils and irregular apertures. The final part treats speckle imaging with an annular Hermite Gaussian laser beam. The book is meant for researchers and academics who want a thorough account of speckle image formation, modulation and processing.