A. M. Malyarevich 1 ) (a), V. G. Savitsky (a) I. A. Denisov (a), P. V. Prokoshin (a), Subject classification: 78.66.Jg; 78.67.Hc; S8.11; S8.12; S10.15 Nonlinear optical properties of phosphate and silicate glasses doped with PbS and PbSe quantum dots of different sizes were studied. Absorption saturation intensity in the range of the first and second excitonic transitions was estimated. Passive Q-switch operation of glasses doped with PbSand PbSe-quantum dots as saturable absorbers for 1.067 mm Nd 3+ : KGd(WO 4 ) 2 , 1.54 mm Er : glass and 2.1 mm Ho 3+ : Cr 3+ : Tm 3+ : Y 3 Al 5 O 12 diode-and flashlamp-pumped lasers was demonstrated.1. Introduction Glasses doped with semiconductor quantum dots (QDs) are being extensively studied as promising materials for various photonics applications. Recently passive Q-switch and mode-locking operation for both pulse and cw pumped lasers were presented at 0.7-0.9 mm with CdTe-doped glasses [1-3] and at 1.06-1.08 mm with CuInSSe-doped ones [4]. In the near infrared region PbS(Se) QDs are very attractive to be used as saturable absorbers. The reason is that PbS and PbSe have a large bulk exciton Bohr radius (a B 18 and 33 nm, respectively) and small energy bandgap (E g 0.41 and 0.28 eV, respectively) at room temperature, which allows to obtain the first absorption resonance in a wide spectral range from 3 down to 1 mm only by varying the QD size. Glass containing PbS QDs was successfully used as passive mode-locker for a Cr:forsterite laser at 1.2-1.3 mm [5].In this paper we present nonlinear optical properties of PbS and PbSe quantum dots in phosphate and silicate glasses and their applications for Q-switching of Nd:KGW (at 1.067 mm), Er:glass (at 1.54 mm) and Ho : YAG (at 2.1 mm) lasers with diode and flashlamp pumping.

No abstract

A new fluorophosphate glass matrix containing PbSe quantum dots characterized by a narrow size distribution (Delta R/R similar to 5-7%, where R is the size of a quantum dot) is prepared under heat treatment. It is demonstrated that fluorophosphate glasses can be doped by introducing (ZnSe + PbO) or PbSe into the composition of the glass. The optical absorption spectra of the quantum dots corresponding to the strong quantum confinement regime are studied over a wide range of quantum-dot sizes (4-18 nm). The nonlinear optical absorption is investigated at a wavelength of 1.54 mu m. It is revealed that the introduction of (ZnSe + PbO) rather than of PbSe into the composition of the glass improves the bleaching contrast owing to a more uniform distribution of the quantum dots over the volume of the glass sample

No abstract

No abstract