Reference : Assessment of space radiation effects on solid-state Brillouin phase conjugate mirrors
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Assessment of space radiation effects on solid-state Brillouin phase conjugate mirrors
Brignon, Arnaud [Thales TRT > > > >]
Richard, Sébastien [Thales TRT > > > >]
Gusarov, Andreï [Studiecentrum voor Energie = Centre d'Etude de l'Energie Nucléaire - SCK = CEN > > > >]
Berghmans, Francis [ > > ]
Georges, Marc mailto [Université de Liège - ULiège > > CSL (Centre Spatial de Liège) >]
Thibert, Tanguy mailto [Université de Liège - ULiège > > CSL (Centre Spatial de Liège) >]
Lien, Yngve [ > > ]
Applied Optics
Optical Society of America
Yes (verified by ORBi)
[en] Phase conjugation ; space qualification ; radiation effects
[en] Optical phase conjugation (OPC) provides a means of dynamical correction of thermally induced aberrations in high-power laser systems. This method is particularly interesting for space applications because it is passive, mechanically simple, and allows for improved beam quality with only a small loss in power. To exploit it one has to assess the effect of the space environment, and in particular of space radiation, on the properties of the materials that are suitable for phase-conjugating mirrors (PCMs). We have investigated both materials providing OPC via stimulated Brillouin scattering and actual PCMs with regard to their radiation hardness. Proton- and gamma-irradiated PCMs in the form of 30-cm long silica rods and 5-cm long TeO2 crystals were tested in a single frequency flash-lamp pumped Nd:YAG system delivering up to 220 mJ pulses with a 20 ns duration at a 50 Hz repetition rate. The difference in the reflectivity between irradiated and nonirradiated components was found to be within the measurement errors. Gamma irradiation of TeO2 resulted in a decrease of the laser-induced damage threshold, while for silica possible changes were below the detection limit. Our results show that synthetic fused silica, and Lithosil in particular, can be used for generating the OPC in laser systems operating in a space radiation environment.
Agence spatiale européenne - ESA
Researchers ; Professionals

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