We give an up-to-date description of some present development issues, together with an architecture study and a systems engineering analysis, in the area of laser sources for the injection of the Laser Mé ga-Joule (LMJ), which are a part of the French ICF fusion program. After a brief description of the main concepts, the overview consists of two parts. The first one includes the standard first source (allfiber design) that will be used for the activation of the facility of Ligne d'Inté gration Laser (LIL), the reduced-scale demonstrator under construction for the validation of the concepts and technology to be selected for the LMJ. The second one describes the state of the art in the prototyping of a new source, with extended performance with respect to optical noise and robustness, to be tested on LIL in a second step of the activation.
Highly efficient parametric amplification and wavelength conversion have been demonstrated in the 1040–1090 nm band. A nonlinear photonic crystal fiber was used to provide the anomalous dispersion required for phase matching at 1 μm. A 40 dB maximum gain and +35 dB idler conversion efficiency have been achieved in the subnanosecond pulsed regime and by using a spectrally filtered supercontinuum source as a small signal.
The Fibre-Injection System in the LIL-LMJ facilities makes use of a single-mode fiber based arborescent architecture. Starting from a unique single-mode oscillator, it consists of a high performance PM design which is dedicated to the generation of pulses onto a large number of synchronous outputs. The optical features to be optimised involve dynamic ranges in excess of 50 dB and the generation of 25 ns wide arbitrary waveforms at 100 ps time resolution, of which the PSD looks like a precisely controlled Bessel distribution. We analyse the complete design issues, together with the optical components which have been developed specifically.To cite this article: A.
We demonstrate an innovating design to validate and to optimize the real-time performance of an all-optical oscilloscope at 1053-1064 nm. A unique broadband pulse is generated by means of frequency beats and of proper optical-shaping, which helps us to evidence a signal bandwidth of 100 GHz and a dynamics range in excess of 25 dB. Gain-narrowing and dispersion effects due to the replication of the input pulse are shown to be the first limitations in the broadband capabilities.
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