Direct imaging of rare-earth ion clusters in Yb:CaF2

1. Lacroix, B.
2. Genevois, C.
3. Doualan, J.L.
4. Brasse, G.
5. Braud, A.
6. Ruterana, P.
7. Camy, P.
8. Talbot, E.
9. Moncorgé, R.
10. Margerie, J.