Abstract
Important figure of merit of high-intensity laser systems is the temporal and spatial quality of their pulses. Spatial filtering is a well known technique to improve the spatial quality by modulating the spatial components at the Fourier-plane, using a pinhole of appropriate size or recently by a nonlinear process. Modulation of the beam in the Fourier-plane allows however a simultaneous spatial and temporal filtering. By the use of a conjugate pinhole arrangement before and after the nonlinear spatial selector, intensity dependent transmission is obtained: the low intensity part is efficiently suppressed. Numerical calculations predict practical operation for both amplitude and phase modulation at the Fourier-plane. In the preferred latter case the experimental observations are in good agreement with the theory, demonstrating >40% throughput.
Highlights
Spatial filtering is a well known technique to improve the spatial quality by modulating the spatial components at the Fourier-plane, using a pinhole of appropriate size or recently by a nonlinear process
In the preferred latter case the experimental observations are in good agreement with the theory, demonstrating >40% throughput
Major figure of merit of high-intensity laser systems is how efficiently they can temporally and spatially concentrate the energy carried by the pulse
Summary
Major figure of merit of high-intensity laser systems is how efficiently they can temporally and spatially concentrate the energy carried by the pulse. Using a novel way for frequency doubling – called active spatial filtering [3] – the inherent temporal cleaning of the intensity dependent nonlinearity occurs, and efficient spatial filtering can be realized This leads to a double wavelength system where the temporal and spatial contrast are reset in the “middle” of the system, resulting in output pulses of excellent spatial and temporal quality for medium output power. Disadvantages of plasma mirrors are that they are positioned into a beam of finite size, where the optical quality of the plasma front influences the phase front of the beam and that a fresh target area is needed for each shot For these reasons we are looking for a pulse-cleaning technique, which is generally applicable both for single and dual wavelength lasers, and does not suffer from the shortcomings of the standard plasma mirror method
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