χ(3) measurement and optical limiting studies of urea picrate

Naseema, K.; Shyma, Mary Y.; Manjunatha, K.; Muralidharan, Ajith; Umesh, G.; Rao, Vijayalakshmi

doi:10.1016/j.optlastec.2011.03.025

Cited by 58 publications

(8 citation statements)

References 24 publications

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“…The experimental setup details and findings of the Z scan method for the KHS crystal are displayed in Table 3. Additionally, the high value of χ 3 confirms the electron density transfer in the grown crystal [16].…”

Section: Z-scan Analysissupporting

confidence: 53%

Growth, Surface Morphology and Mechanical Properties of Potassium Hydrogen Sulphate Single Crystals for Antimicrobial and Third-Order NLO Applications

Thilaga,

Selvarajan,

Kader

2023

Phys. Chem. Sol. State

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A good quality single crystal of potassium hydrogen sulphate (KHS) has been grown and subjected to characterization techniques including single crystal X-ray diffraction, scanning electron microscope, hardness test, Z-scan and antimicrobial test. The single crystal X-ray diffraction study discloses the orthorhombic system of the KHS crystals. The SEM analysis shows the formation of tiny hillocks in the KHS crystal. Vickers microhardness test was utilized for testing the mechanical hardness of the grown KHS crystals. Moreover, the mechanical parameters such as elastic stiffness constant and yield strength were also determined. The nonlinear optical properties such as nonlinear susceptibility, nonlinear refractive index, and nonlinear absorption coefficient were estimated by Z scan analysis. In addition, antimicrobial activity was performed against certain pathogens for medication applications.

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Section: Z-scan Analysissupporting

confidence: 53%

Growth, Surface Morphology and Mechanical Properties of Potassium Hydrogen Sulphate Single Crystals for Antimicrobial and Third-Order NLO Applications

Thilaga,

Selvarajan,

Kader

2023

Phys. Chem. Sol. State

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“…The n 2 can be measured by the closed aperture spectrum obtained from the difference of the peak and valley transmission (Δ T P – V ) with respect to the axis phase shift (|Δϕ|) using the following equation: According to the above equation, the linear transmittance (S) after the aperture was measured using the relation where r a denotes the radius of the aperture and w a denotes the beam waist radius in front of the aperture. The n 2 index can be expressed by the relation where , L eff is the effective thickness, and I 0 is the incident irradiance of the laser beam at the focal point ( Z = 0). The effective thickness ( L eff ) depends on the linear absorption coefficient (α) and the thickness of the crystal ( L ), and it can be calculated using the following expression: …”

Section: Resultsmentioning

confidence: 65%

Evaluation of Linear and Nonlinear Optical Properties of D−π–A Type 2-Amino-5-Nitropyridinium Dihydrogen Phosphate (2A5NPDP) Single Crystal Grown by the Modified Sankaranarayanan–Ramasamy (SR) Method for Terahertz Generation

Vediyappan¹,

Chaudhary

Venkatesh

et al. 2019

Crystal Growth & Design

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We report the growth process and linear and nonlinear optical characterization of high quality improvised semiorganic 2A5NPDP single crystal using the modified SR method for the first time. The major difficulties for the growth of 2A5NPDP single crystal have been resolved with the aid of a temperature lowering method. After optimization of the growth conditions, a transparent 2A5NPDP single crystal was harvested with a size of 85 mm length and 10 mm diameter over a period of 60 days. The growth rate of the modified SR method grown crystal was found to be 10 times higher than that of the conventional slow evaporation solution technique (SEST) grown crystal. The unit cell parameters of the grown crystal were ascertained by the single crystal X-ray diffraction (SXRD) and powder X-ray diffraction (PXRD) techniques. The high crystalline perfection of the crystal was ascertained by using a high-resolution X-ray diffraction (HRXRD) technique. The presence of multifarious functional groups of the 2A5NPDP crystal were confirmed by Fourier transform infrared (FT-IR) and Fourier transform Raman (FT-Raman) spectral analyses. The thermal property was assessed by the thermogravimetric (TG) and differential thermal analysis (DTA). It shows that the grown crystal withstands temperature up to 175 °C. UV–vis–NIR analysis was used to measure the linear optical property while third-order nonlinear optical properties were ascertained using Z-scan and optical limiting (OL) techniques. The optical limiting threshold of conventional method grown crystal is 5.7 mW/cm2, whereas the modified SR method grown crystal is 4.7 mW/cm2. Low value of limiting threshold indicates that the grown crystal has minimum defects. Finally, 800 nm wavelength of 140 fs at 80 MHz repetition rate obtained from a Ti:sapphire oscillator was used for the terahertz (THz) generation between 0.1 and 2.1 THz range. The efficiency of the generated THz signal was measured using another 800 nm wavelength of 40 fs, at 1 kHz repetition rate obtained from a Ti:sapphire amplifier. The generated THz signal is separated out from unconverted 800 nm using Teflon filters, and power is measured using a pyrometer. The maximum conversion efficiency of generated THz signal is on the order of 0.63 × 10–5%.

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“…In fact, several organic salts can give nanocrystalline systems with OPL properties. While compound 87 (Chart 24) displayed nonlinear refractive index η 2 = −1.258 × 10 −11 esu, nonlinear absorption coefficient β = 2.146 cm/GW, and third-order susceptibility χ (3) = 0.377 × 10 −13 esu, 719 the crystal bis(2-aminopyridinium)-succinate-succinic acid 88 single crystal (Chart 24) had a nonlinear refractive index η 2 = −2.4189 × 10 −8 cm 2 /W. 720 Nonlinear transmission measurements with ns pulses of hybrid organic−inorganic crystal 89 (Chart 24) were also reported.…”

Section: Non Macrocyclic Moleculesmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.

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χ(3) measurement and optical limiting studies of urea picrate

Cited by 58 publications

References 24 publications

Growth, Surface Morphology and Mechanical Properties of Potassium Hydrogen Sulphate Single Crystals for Antimicrobial and Third-Order NLO Applications

Growth, Surface Morphology and Mechanical Properties of Potassium Hydrogen Sulphate Single Crystals for Antimicrobial and Third-Order NLO Applications

Evaluation of Linear and Nonlinear Optical Properties of D−π–A Type 2-Amino-5-Nitropyridinium Dihydrogen Phosphate (2A5NPDP) Single Crystal Grown by the Modified Sankaranarayanan–Ramasamy (SR) Method for Terahertz Generation

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

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