Third-order nonlinear optical properties of Mn doped ZnO thin films under cw laser illumination

Optical Nonlinearity Investigation of the Novel Organic-Inorganic Hybrid Salt: 1,1'-methylenedipyridinium pentacynidonitrosoferrate(II)pentahydrate Using Z-Scan System

“…The reported values of n 2 and β of the studied sample in Table I can be compared with recently reported values of n 2 and β of different nonlinear optical materials with CW laser excitation [19,[41][42][43][44].…”

CW Optical Limiting Study in Disperse Yellow Dye-doped PMMA-MA Polymer Films

“…6 respectively. In open aperture Z-scan, DY-7 has shown a decrease in transmittance with an increase in irradiance/input intensity due to reverse saturation absorption [37][38][39].…”

Influence of Pr Doping on the Structural, Morphological, Optical, Luminescent and Non-linear Optical Properties of RF-Sputtered ZnO Films

“…The switch over from saturable absorption to reverse saturable absorption is an interesting effect that can be utilized for optical switching, optical pulse compression and laser pulse narrowing. The change over in sign of the non-linearity is related to the interplay of exciton band bleach and optical limiting mechanisms [100].In semiconductors, RSA results mainly due to the nonlinear mechanisms such as two-photon absorption (TPA), free-carrier absorption (FCA), nonlinear scattering or a combination of these processes [95,101]. In semiconductors, two-photon absorption is allowedwhen the incident light source energy is less than the direct band gap energy Eg, but greater than Eg/2.…”

“…In semiconductors, two-photon absorption is allowedwhen the incident light source energy is less than the direct band gap energy Eg, but greater than Eg/2. For ½ E g <hω<Eg the nonlinear response involves virtual processes and the two photon process is much stronger than the one-photon process [95,101]. TPA is one of the important basic mechanisms for induced absorption.…”