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2-Amino-5-nitropyridinium halides (2A5NPBr)/(2A5NPCl) were synthesized by dissolving 2-amino-5-nitropyridine in hydrobromic/hydrochloric acid. Nanoparticles of 2A5NPBr and 2A5NPCl were attained by hydrothermal method. For comparison and estimation of mechanical properties, single crystals of the samples were grown by slow evaporation process. SEM analysis shows the formation of nanoparticles of 2A5NPBr and 2A5NPCl with average grain size of 50 and 100nm, respectively. UV-Vis analysis reveals that the materials possess low cut-off wavelength and a wide optical transmission window. By Vickers test, the Meyer index (n) was estimated to be 1.33 for 2A5NPBr and 2.49 for 2A5NPCl crystals. The SHG efficiency of 2A5NPBr and 2A5NPCl nanoparticles was calculated to be 1.5 and 4.3 times that of well known NLO material KDP. The role of cations in demonstrating the desired NLO properties were discussed in detail.

We have developed a two-photon fluorescence microscope capable of imaging up to 4mm in turbid media with micron resolution. The key feature of this instrument is the innovative detector, capable of collecting emission photons from a wider surface area of the sample than detectors in traditional two-photon microscopes. This detection scheme is extremely efficient in the collection of emitted photons scattered by turbid media which allows eight fold increase in the imaging depth when compared with conventional two-photon microscopes. Furthermore, this system also has in-depth fluorescence lifetime imaging microscopy (FLIM) imaging capability which increases image contrast. The detection scheme captures emission light in a transmission configuration, making it extremely efficient for the detection of second harmonic generation (SHG) signals, which is generally forward propagating. Here we present imaging experiments of tissue phantoms and in vivo and ex vivo biological tissue performed with this microscope.

L-Glycine Glycinium Hydrochloride Monohydrate (L-GGHCM), a new second-order nonlinear optical crystal, was produced using the slow evaporation process with double distilled water as a solvent. Powder XRD analysis was completed in order to identify the crystallinity sample. In the orthorhombic system with space group P${}_{212121}$, L-GGHCM expands in accordance with structural improvement. A single crystal XRD analysis discovered the extended framework architecture of L-GGHCM, a self-assembly process involving short-range and directed bonds, among many other interactions. The optical quality and transmission of the synthesized crystal were determined using UV–visible and fluorescence spectrum analysis. The effectiveness of L-GGHCM’s second harmonic generation is roughly 1.7 times compared to a standard potassium dihydrogen orthophosphate sample. Thermal analysis is used to study a material’s thermal stability and internal decomposition. L-glycine glycinium hydrochloride monohydrate crystal is shown to have good thermal stability.