Study of transient characteristic of excited-state nonlinear absorption by single laser pulse

A new method for studying excited-state nonlinear absorption through measuring the temporal profile of input and output single laser pulses was presented. Using this method, the transient excited-state nonlinear absorption of the solution of cadmium-texaphyrin-like in chloroform ((TXP)Cd) and the methyl orange solution were demonstrated by the ns laser pulse. The reverse saturable absorption in (TXP)Cd and the combination of saturable absorption and reverse saturable absorption in methyl orange were observed respectively. The theoretical simulations agree well with the experimental results.