Steady-state and transient thermal lens behavior in the dual beam Z-scan arrangement

Abstract

Output beam spatial properties of a dual wavelength CW DPSS laser have been studied using the thermal lens (photothermal) effect. In employing the Z-scan technique both the steady-state and time-dependent thermal lens signal as a function of sample position could be examined simultaneously. The influence of sample thickness and laser output power upon obtained spatial properties of incident beam is studied. It is shown, that both the steady state and the transient photothermal signal provide comparable results.

All-optical modulation and photonic diode based on spatial self-phase modulation in porphyrin–napthalimide molecules

“…23 The cross-phase modulation (XPM) is the process in which the nonlinear optical phase of one weak optical signal is switched and modulated with a strong optical signal. 24 Recent studies on the NLO responses of various material systems have drawn a lot of interest due to their importance in various optical devices, like all-optical conversion and switching, logic gate applications using SSPM and XPM processes, mostly employing inorganic systems as the nonlinear optical media. 19,[25][26][27][28][29] Considering the ease of obtaining molecular engineering using novel synthetic protocols, it is highly beneficial if these applications can be achieved using organic molecular systems.…”

Analysis of Z-scan measurement for large thermal nonlinear refraction in gold nanoparticle colloid

“…Thermal nonlinear refraction of materials has been intensively measured using Z-scan technique based on these thermal lens models. [7][8][9][10][11][12][13][14][15][16][17][18] It is necessary to point out that the small phase shift has been induced in the reported media and the conventional thermal lens models are suitable for these cases. However, in our previous work, 18 the reported far-field diffraction patterns of the gold nanoparticles (AuNPs) dispersed in cyclohexanone indicates that large thermal phase shift induces in the medium when using low power laser irradiation at 532 nm.…”