Investigation of optical nonlinearity and diffraction ring patterns of carbon nanotubes

Z-scan measurements of the third order optical nonlinearity of C60 doped poly(ethylacetylenecarboxylate) under CW regime

“…The defocusing effect obtained in the studied samples is due to thermal nonlinearity resulting from absorption of a tightly focused CW laser beam propagating through an absorbing medium producing a spatial distribution of temperature in the sample solution. This leads to a spatial variation of the refractive index that acts as a thermal lens resulting in severe phase distortion of the propagating beam [25,26].…”

“…[25]. The measurements were done with linearly polarized TEM 00 Gaussian beam of a CW diode laser at 20 mW ( = 635 nm).…”

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

“…Z-scan measurements The Z-scan experimental setup was analogous to that described in Refs. [6,25]. The measurements were done with linearly polarized TEM 00 Gaussian beam of a CW diode laser at maximum power of 26 mW (λ = 635 nm).…”

“…The self-defocusing effect obtained in the studied sample is due to the local variation of the refractive index with the temperature ( dn/dT ), and is attributed to a thermal nonlinearity resulting from the incident tightly focused CW laser beam. The localized absorption of the laser beam propagating through an absorbing solution medium produces a spatial distribution of the temperature in sample solution and, consequently, a spatial variation of the refractive index that acts as a thermal lens results in the phase distortion of the propagating beam [25,33,34]. The thermal effect has been discussed by Sheik-Bahae et al [15,16,35] in terms of temperature derivative of the index of refraction ( dn/ dT ) of the medium.…”

Z-Scan Measurements of the Third-Order Optical Nonlinearity of a C60Doped Poly(dimethylacetylendicarboxylate)

“…The Z-scan experimental setup was analogous to that described in Ref. [23]. The measurements were done with linearly polarized TEM00 Gaussian beam of a CW diode laser at 26 mW (λ = 635 nm as shown in Fig.…”