Absorption in neodymium glasses during the passage of an intense laser pulse
Ivanov V. V. , Senatskii Yu. V. , Sklizkov G. V.
A jump in the absorption at the wavelength 0.66 /zm and 1.053 μπι has been observed during the self-focusing of a subnanosecond laser pulse in neodymium glasses. The jump stems from the filling of the 4/M/2 lower level of the working transition of the Nd3+ ion. The absorption relaxation has a time constant rr >10^8s.