Studies on the growth and characterization of benzimidazole single crystals—vertical Bridgman technique

107

Single crystals of L-Prolinium tartrate (C 5 H 10 NO 2 ), a new organic non-linear optical material of size: 15 × 10 × 10 mm 3 were grown using submerged seed solution growth method. Characterization of the crystals was made using single crystal X-ray diffraction and density determination. Spectroscopic, thermal, optical and mechanical studies were carried out. These studies show that the crystals are thermally stable upto 161°C, transparent for the fundamental and second harmonic generation of Nd: YAG (λ = 1064 nm) laser and possess good mechanical strength. Second harmonic generation (SHG) conversion efficiency was investigated to explore the NLO characteristics of this material using Kurtz and Perry method and it was found that the SHG conversion efficiency is about 90% of that of the standard KDP crystals. Laser damage threshold study was also carried out.

Section: Laser Damage Thresholdmentioning

confidence: 99%

Growth and characterization of L‐prolinium tartrate – A new organic NLO material

Dhas

Natarajan

2007

107

“…This is because thermal effects take several nanoseconds to buildup and could take several milliseconds to decay. From this analysis we found that the laser damage threshold is higher than inorganic crystal of potassium dihydrogen phosphate (KDP) and lower than that of benzimidazole single crystals [15]. The laser damage threshold of some NLO crystals are given in table 1 [16].…”

Section: Characterizationmentioning

confidence: 94%

Studies on the structural, thermal and optical behaviour of solution grown organic NLO material: 8‐hydroxyquinoline

Vijayan

Bhagavannarayana²,

Maurya

et al. 2007

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Single crystal of 8-hydroxyquinoline (8HQ) having chemical formula C 9 H 7 NO, an organic nonlinear optical (NLO) material has been successfully grown by slow evaporation solution growth technique at room temperature. The crystal system has been confirmed from the powder X-ray diffraction (PXRD) analysis. The crystalline perfection was evaluated by high resolution X-ray diffractometry (HRXRD). From this analysis we found that the quality of the crystal is quite good. However, a very low angle (tilt angle 14 arc sec) boundary was observed which might be due to entrapping of solvent molecules in the crystal during growth. Its optical behavior has been examined by UV-Vis. analysis, which shows the absence of absorbance between the wavelengths ranging from 400 to 1200 nm. From the thermal analysis it was observed that the material exhibits single sharp weight loss starting at 113°C without any degradation. The laser damage threshold was measured at single shot mode and the SHG behavior has been tested using Nd:YAG laser as a source.

“…Irradiation methodology The BMZ single crystals were grown by melt growth technique and the growth details were reported elsewhere [4,5]. The vertical Bridgman grown BMZ crystal was used for the present investigation.…”

Section: Methodsmentioning

confidence: 99%

Effects of 50 MeV Si ion irradiation on nonlinear optical benzimidazole single crystals

Kanagasekaran

Mythili

Srinivasan

et al. 2007

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The 50 MeV Si 7+ ion irradiation induced modifications on structural, dielectric, optical and mechanical properties of Vertical Bridgman grown benzimidazole (BMZ) crystals were studied. The high resolution Xray diffraction studies show the quality of as grown BMZ and irradiated BMZ crystals. The dielectric constant and dielectric loss as a function of frequency and temperature was studied in detail. The ion induced mechanical behaviour of both as grown BMZ and irradiated BMZ crystals has been explained with the indentation effects using Vickers microhardness tester. UV-VIS. studies reveal the decrease in bandgap values and defects on irradiation. The above results are discussed in detail.