The monolithic integration of passively mode-locked solid-state lasers at highest repetition rates has been prevented by Q-switching instabilities and the lack of integrable saturable absorbers to date. In this thesis we demonstrate in theory and experiment that active feedback electronics controlling the intracavity loss of the laser is capable of suppressing the Q-switching instability. We in...

The present work reports the effects of meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) aggregation on its excited states absorption spectra, triplet quenching by molecular oxygen and singlet production. Experimental techniques such as optical absorption, Z-scan with a white light continuum source Laser Flash Photolysis were used to fulfil study. J-aggregates possess reverse saturable in 50...

in this study, the nonlinear optical properties and optical limiting performance of the silver nanoparticles (agnps) in distilled water are investigated. the nonlinear absorption coefficient of the colloid is measured by the z-scan technique. the optical limiting behavior of the agnp suspension is investigated under exposure to nanosecond laser pulses at 532 nm. the results show that nonlinear ...

In the present work, KTP crystals have been grown by spontaneous nucleation technique in flux medium using K6P4O13 flux. 0.4-1 °C/h cooling rates were applied in the spontaneous nucleation process. The presence and amount of impurities has been determined by using XRF. The optical transmission spectra of impure KTP crystals in the UV–visible region are discussed. The transmission cut-off is cle...

Polymer composites are one of the most attractive near-termmeans to exploit the unique properties of carbon nanotubes and graphene. This is particularly true for composites aimed at electronics and photonics, where a number of promising applications have already been demonstrated. One such example is nanotube-based saturable absorbers. These can be used as all-optical switches, optical amplifie...

1 The renal handling of iohexol was examined in the rat isolated perfused kidney (IPK)-1 (C1r/GF) of 0.63 ± 0.06 could be indicating that a saturable mechanism is involved in the luminal disappearance of the drug. 3 Pretreatment of the kidneys with polylysine, probenecid or diatrizoate resulted in a significantly enhanced clearance o f iohexol, probably due to inhibition of membrane binding. Re...

InP/ZnSe/ZnS QDs with surface fluorination treatment were fabricated and their nonlinear saturable absorption properties explored. Passive Q-switching of diode-pumped Nd:YVO 4 near-infrared laser at 1064 nm (∼1.0 μm) using InP-HF as absorber (SA) is observed.

Graphene is one of the most attractive two-dimensional nanomaterials widely used as saturable absorber for pulsing laser, owing to its unique non-linear optical responses. However, fabrication and integration graphene into a laser cavity involves complex processes procedures. Mass production graphene-based absorbers requires simplification process with minimum material wastage. Reduced oxide, f...