2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12454It is shown how laboratory experiments performed with high intensity femtosecond lasers can probe the physics of black holes in the near-horizon regime. The acceleration generated by the high intensity laser ranging from $10^{13}$g to more than $10^{18}$g is identified with the gravitational acceleration at stretched horizons. In the black-hole's asymptotic region, the stretched-horizon-reflected light shows a measurable universal phase acceleration of $c^4/4GM$. PACS numbers: 04.70.Bw, 97.60.Lf, 52.40.Nk, 52.50.Jm15 pages, 4 figures included (psfig used), LateX-209, e-mail: gos@tpi.uni-jena.de, sauerbrey@qe.physik.uni-jena.deAstrophysicstext