Optical properties of Er-doped GeS2-Ga2S3 glasses

Erbium doped chalcogenide glasses are of great interest in integrated optoelectronics technology, due to their Er3+ intra-4f emission at the standard telecommunication wavelength of 1 54 mu m In this report, the optical absorption and photoluminescence (PL) of chalcogenide (GeS2)(80)(Ga2S3)(20) glasses doped with 0 6 and 1 8 mol % Er2S3 have been evaluated The role of the excitation wavelength on the emission cross section at similar to 1540 nm, attributed to the 4|(13/2) -> 4|(15/2) transition of the Er3+ ion, has been specified, and basic optical properties have been determined For this purpose, the Judd-Ofelt (J-O) theory has been applied to calculate the intensity Q, parameters Consequently, radiative properties such as the radiative transition probabilities (A(R)), the total radiative transition probabilities (A(T)) and the radiative lifetimes (tau(R)) have been determined In particular, the present glasses have exhibited relatively high tau(R) values, of about 3 4 ms The influence of the Er-doping level on the PL line-shape at similar to 1540 nm has been specified by such spectroscopic parameters as the full width at half maximum and the stimulated emission cross-section (sigma(e)) for the 4|(13/2) -> 4|(15/2) transition