Research on ‘Thermal Lens Investigation of the CdSe Quantum Dots using Dual Beam Z-Scan Technique’

 A research conducted at the University of Damascus in cooperation with the Atomic Energy Commission of Syria sheds light on the effect of the thermal lens (TL) of Cadmium Selenide quantum dots (CdSe QDs) using a dual beam Z-scan technique, where the nonlinear optical properties of the thermal lens of CdSe QDs were investigated by applying the two CW laser beams (λ = 532 nm and λ = 632.8 nm).

The thermal lens parameters of the CdSe solutions, such as: the on-axis phase shift (θ), the thermal diffusivity (D), and thermal diffusion time (tc) were extracted using the theoretical thermal lens model. Our results give new insight into the CdSe QDs dissolved in toluene and are valuable for further development of semiconductor QDs optical devices.

Thermal lens studies of CdSe QDs were very limited; so, this article presents new results related to the TL effect of the CdSe QDs dissolved in toluene using the dual-beam z-scan configuration.

One of the most important results of the research was recording the TL signals of CdSe QD’s using the dual beam z-scan configuration. The TL signals depend on the input pump laser powers. The temperature profile and convective velocity of CdSe QD’s were calculated using Green function for the heat conduction and convection equation, the simulation of temperature profiles using the Matlab software.