Comparison of Z-scan and THG derived nonlinear index of refraction in selected organic solvents

Third-harmonic generation at interfaces with femtosecond pulses: self-focusing contribution and nonlinear microscopy

“…By our results, chloroform has somewhat stronger orientational nonlinearity in comparison with acetone, which is in agreement with Rau et al 58 In the case of DMSO, it seems that this solvent has no significant orientational nonlinearity for the pulse widths we have used here.…”

“…58 For a positive nonlinearity, as is usual for the instantaneous electronic polarization of optical glasses, the refractive index is larger at the center of the laser beam than at its periphery, resulting in a positive lens whose focal length depends on the laser irradiance and sample nonlinearity. 59 In In order to verify the validity of the model proposed, we carried out THG Z-scan measurements using a commercial optical parametric amplifier (OPA) (TOPAS, from Light Conversion), synchronously pumped by a chirped-pulse-amplified system (CPA 2001-Clark MXR) with a 775 nm central wavelength and 150 fs pulse duration at 1 kHz repetition rate.…”

“…Several organic solvents have both electronic and orientational nonlinearities. 58 Here, working in the tightly focused laser beam condition and with a silica cuvette filled with solvent, we can obtain conditions where the self-focusing occurs inside the silica, where only the electronic nonlinearity is present, and a situation where self-focusing occurs inside the solvent, where both contributions, electronic and orientational, may be present. In addition, the instantaneous electronic nonlinearity is a constant as a function of the pulse width, which is not the case for the orientational one.…”

Calibration and rotational contribution in third-order NLO properties characterization

“…[15] (see also Rau et al [16]). The excitation is provided by a linearly polarized mode-locked Nd:YAG laser, operating at the wavelength of 1064 nm, with a pulse duration of 16 ps and a repetition rate of 10 Hz.…”

Growth and characterization of dexterous nonlinear optical material: Dimethyl amino pyridinium 4-nitrophenolate 4-nitrophenol (DMAPNP)

“…The speck extent of the laser beam at the focus was 17.32 mm and the analogous Rayleigh length, which is coupled to the worn laser parameters anticipated was 2.3 mm which persuades the significant state ZR >> L. Consequently, the sample width of 1.3 mm was less than the Rayleigh length and therefore it could be consider as a slim medium. The schematic design of the investigational set-up has already been examined [53,54]. The beam transmission through an opening (aperture) situated in the far-away field was deliberate by photo detector which fed to the digital power meter.…”