Effect of L-arginine-phosphate doping on structural, optical and strength properties of KDP single crystal

Abstract

L-arginine-phosphate doped Potassium Dihydrogen Phosphate single crystals with 0.2…4.4 wt.% concentration in the solution was grown on a point seed by the method of temperature reduction. The grown KDP:LAP crystals were characterizied by UV-vis spectroscopy, powder XRD analysis, differential thermal and thermogravimetric analyses and second harmonic generation efficiency measurements. The mechanical and laser strength values of LAP doped KDP crystals have been evaluated. Slight variation in the unit cell parameters of KDP:LAP has been reported. It has been shown that the efficiency of second harmonic generation conversion in KDP:LAP crystals was higher by more than 3-fold as compared to the corresponding values of pure KDP. The experimental results evidence the suitability of the grown KDP:LAP crystals for optoelectronics, and the study is helpful for further searching and designing of hybrid NLO materials.

Polarimetric studies of L-arginine-doped potassium dihydrogen phosphate single crystals

“…X-ray diffraction studies of KDP and KDP:l-Arg crystals show variations in the lattice parameters at the level of only $10 À4 Å , confirming the high quality of the crystals. No changes were observed in the external morphology of the l-Arg-doped KDP crystals, and only a slight blocking of the {100} faces compared with pure KDP was noted (Kostenyukova et al, 2019).…”

“…Unfortunately, we do not have the capability for polarimetric measurements at lower wavelengths, in particular in the UV region. The anisotropy of the absorption in l-arginine-doped KDP crystals (Kostenyukova et al, 2019) may indicate the presence of linear dichroism, which is exhibited in any optically active molecule (Rodger, 2013). The differences in the dispersion of OA should be noticeable in this region, but polarimetric studies under such conditions are significantly more challenging.…”

“…It has been observed that the efficiency of second-harmonic generation (SHG) in l-arginine (l-Arg)-doped crystals rises by a factor of about 2 in comparison with pure KDP (Parikh et al, 2010;Kostenyukova et al, 2016). Naturally, various experimental techniques have been used to characterize these materials, for example, X-ray diffraction, UV-visible-IR spectroscopy, and thermal and mechanical analyses (Kostenyukova et al, 2019;Lavanya & Ravindran, 2019;Dolzhenkova et al, 2017;Pritula et al, 2016). It would be useful to supplement these techniques by the methods of optical anisotropy measurement applied to the above-mentioned doped crystals.…”