The combined effects of hydrostatic pressure and temperature on the optical absorption coefficient and refractive index changes of a hydrogenic impurity in a disc-shaped quantum dot with parabolic confinement in the presence of an external electric field have been investigated by using the perturbation method within the effective-mass approximation. Analytical expressions for the linear and thi...

There are two figures of merit used to assess the suitability of a nonlinear material for all-optical switching devices [8]. If the loss is dominated by linear absorption, W = A n l a must be larger than unity. In PTS, W > 1 for I > 20MW/cm2, based on attenuation coefficients estimated from those reported by Thakur, Frye and Greene [9]. In the case where two-photon absorption dominates the loss...

Ultrathin BP QDs with a uniform size of ∼3.4 nm were prepared via small molecule-assisted liquid phase exfoliation and they exhibited superior broadband nonlinear saturable absorption promising for nonlinear optical applications. Laser photolysis measurement implied that the nonlinear response origin was related to the long-lived electron-hole pairs delocalized within the BP QDs.

Since the invention of the laser in 1960, multiphoton effects have become useful in techniques for real applications as well as conceptual predictions. Here, we report the first experimental observation of frequency-upconverted stimulated emission from a novel fluorophore through simultaneous five-photon absorption. Compared to lower-order nonlinear absorption, the fifth-order dependence on inp...

In the present work, The third order optical nonlinearity and optical limiting properties of Magnesium phthalocyanine (MgPc) thin film have been investigated. Third order optical nonlinearity of MgPc thin film has been studied by z–scan method using a cw He-Ne laser at ~633nm wavelength as an exciting source. The normalized transmission for both open and closed aperture z scan are measured and ...