Necklace high harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing

1. Brooks, N.J.
2. Rego, L.
3. Nguyen, Q.L.D.
4. Román, J.S.
5. Binnie, I.
6. Plaja, L.
7. Hernández-García, C.
8. Kapteyn, H.C.
9. Murnane, M.M.