Nonlinear optical studies of calcium tartrate crystals

Abstract

Calcium Tartrate crystals were synthesized using sol-gel technique. Linear optical studies of the crystals were carried out in the UV-Vis-NIR spectral range. Nonlinear optical open aperture z-scan studies were done using high sensitive z-scan experimental technique. Both saturable absorption and reverse saturable absorption behaviour were observed at different input fluences. Reverse saturable absorption characteristic of the crystals make them suitable for optical limiting applications. Our analysis revealed that the novel crystal has the optimum values for the optical limiting parameters which are required for a high-performance optical limiter.

The Effects of Initial Laser Intensity on the Nonlinear Optical Properties of The Laser Dye DQOCI Doped Films Using Z-Scan Technique

“…Our results have a good agreement with those of an earlier report [21]. [22] where T is the normalized transmittance, the value of which was taken from the open aperture saturation. Figure -5.…”

“…This implies that the electrons on the valence band are transited to the conduction band and the laser intensity depletes many electrons from the valence band to the conduction band, leading to decreased absorbance [21]. This kind of action has useful applications in optical switching [22] and is well suited for passive Q-switching or mode locking of lasers [23]. The transformation from SA to RSA suggests that another nonlinear process takes place and becomes dominant, which could be probably due to the TPA (positive absorption).…”

“…The transformation from SA to RSA suggests that another nonlinear process takes place and becomes dominant, which could be probably due to the TPA (positive absorption). The minimum transmittance highlights the better optical limiting efficiency and can be used in efficient optical limiters [22] which can be exploited against radiation induced damage for the protection of eyes, light-sensitive sensors and CCD cameras. behavior is attributed to the variation of refractive index with temperature, resulting in the typical shape of a Z-scan trace for Kerr nonlinearity.…”