May 2014
Intermediate to advanced
464 pages
14h 43m
English
Content preview from Multi-dimensional Imaging
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Chapter 5Dispersion Compensation in Holograms Reconstructed by Femtosecond Light Pulses
5.1 Introduction
The generation of a desired diffraction pattern when employing a femtosecond laser pulse source is a matter of great interest in several hot topics of research, such as high-speed microprocessing [1], multiphoton microscopy [2], optical trapping of particles [3], and the generation of optical vortices [4]. Among other possible approaches, computer generated holograms (CGHs) are diffractive optical elements (DOEs) designed to shape an optical beam into a user-defined intensity distribution in one shot. Usually, CGHs are implemented onto voltage-addressed flat displays working as phase-only spatial light modulators (SLMs). This implementation allows for dynamic applications since the intensity and phase pattern delivered onto the target can be changed in real time.
It is worth remarking that when a pulsed beam passes through a DOE two relevant modifications appear: angular dispersion, due to the strong dependence of the diffraction phenomenon with the wavelength, and temporal stretching, originated from the propagation ...
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