Multi-dimensional Imaging

Chapter 5Dispersion Compensation in Holograms Reconstructed by Femtosecond Light Pulses

Omel Mendoza-Yero^1,2, Jorge Pérez-Vizcaíno^1,2, Lluís Martínez-León^1,2, Gladys Mínguez-Vega^1,2, Vicent Climent^1,2, Jesús Lancis^1,2 and Pedro Andrés³

¹INIT – Institut de Noves Tecnologies de la Imatge, Universitat Jaume I, Spain

²GROC·UJI – Grup de Recerca d'Òptica, Dept. de Física, Universitat Jaume I, Spain

³Department d'Òptica, Universitat de València, Spain

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 ...