Abstract
We investigated influence of the self-diffraction effect on optical Kerr signals of Bi2O3-B2O3-SiO2 glass (BI glass) and CS2 in femtosecond non-collinear pump-probe optical Kerr experiments. By measuring the dependence of the Kerr signals on the pump power and on the polarization angle between pump and probe beams, we found that the optical Kerr signals of CS2 consisted of two components: a fast response and a slow response,which were attributed to the self-diffraction effect and the photoinduced birefringence effect, respectively. The contribution of the self-diffraction effect to the Kerr signals increased with increase of the pump power. For the BI glass, no evident influence of self-diffraction on the Kerr signals was observed.
Highlights
For the last few decades, research of ultrafast all-optical switch has been stimulated by its high-bit-rate handling of optical signals for the need of future integrated optical system [1,2,3]
When the pump and probe beams with equal wavelength are used in the non-collinear pump-probe optical Kerr shutter (OKS) experiments, optical Kerr signals usually originate from two kinds of effects: the photoinduced birefringence effect [7] and self-diffraction that results from laser-induced transient gratings (LITG) [8, 9]
By measuring the dependence of the Kerr signals on the pump power and on the polarization angle between pump and probe beams, we found that the optical Kerr signals of CS2 consisted of two components: a fast response and a slow response, which were attributed to the self-diffraction effect and the photoinduced birefringence effect, respectively
Summary
For the last few decades, research of ultrafast all-optical switch has been stimulated by its high-bit-rate handling of optical signals for the need of future integrated optical system [1,2,3]. Optical Kerr shutter based on femtosecond non-collinear pump-probe technique can be used to measure nonlinear optical (NLO) response of materials. When the pump and probe beams with equal wavelength are used in the non-collinear pump-probe OKS experiments, optical Kerr signals usually originate from two kinds of effects: the photoinduced birefringence effect [7] and self-diffraction that results from laser-induced transient gratings (LITG) [8, 9]. We investigated the self-diffraction and optical Kerr effects of Bi2O3-B2O3-SiO2 glass (BI glass) and CS2 using the femtosecond non-collinear pump-probe OKS technique. For the BI glass, no evident influence of self-diffraction on the Kerr signals was observed This is probably because the optical nonlinearity of BI glasses arose from the electronic polarization process whose response time is shorter than the pulse duration
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