研究目的
Investigation and crystallization of efficient novel nonlinear optical materials for applications in optoelectronics and photonics.
研究成果
Unidirectional growth by SR method produces LGPT crystals with superior crystalline perfection, higher optical transmittance, increased laser damage threshold, and better mechanical properties compared to conventional methods. The crystal is suitable for nonlinear optical device applications due to its noncentrosymmetric structure, good thermal stability, and SHG efficiency.
研究不足
The study is limited to laboratory-scale crystal growth; scalability for industrial applications may require optimization. The thermal stability is only up to 165°C, which might restrict high-temperature applications. The SHG efficiency is lower than some standard materials like KDP.
1：Experimental Design and Method Selection:
The study involved growing L-Glutaminium p-Toluenesulfonate (LGPT) crystals using both conventional slow evaporation and Sankaranarayanan-Ramasamy (SR) unidirectional growth methods to compare properties. Theoretical models included Tauc's relation for band gap and Mayer's law for hardness.
2：Sample Selection and Data Sources:
Crystals were synthesized from analytical grade L-Glutamic acid and p-Toluenesulfonic acid monohydrate (Merck) in de-ionized water. Solubility was measured gravimetrically from 30°C to 60°C.
3：List of Experimental Equipment and Materials:
Equipment included ENRAF NONIUS CAD4 diffractometer for XRD, multicrystal X-ray diffractometer for HRXRD, Shimadzu spectrometer for UV transmittance, Bruker S4 pioneer for photoluminescence, Q-switched Nd:YAG laser (Quanta ray model lab-170-10) for laser damage threshold and SHG, Vickers microhardness tester, and NETZSCH STA 449 F3 Jupiter for TGA/DSC. Materials were L-Glutamic acid and p-Toluenesulfonic acid monohydrate from Merck.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dissolving equimolar ratios in water, stirring, filtering, and drying. Conventional growth used slow evaporation at room temperature; SR method used a seed crystal in a cylindrical ampoule with controlled temperature. Characterizations included XRD, HRXRD, optical transmittance, photoluminescence, laser damage threshold, microhardness testing, TGA/DSC, and SHG efficiency measurement.
5：Data Analysis Methods:
Data were analyzed using Tauc's plot for band gap, formulas for laser damage threshold and microhardness, and comparison with KDP for SHG efficiency.
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Bruker S4 pioneer
S4 pioneer
Bruker
Used for photoluminescence measurements to record emission spectra.
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ENRAF NONIUS CAD4 diffractometer
CAD4
ENRAF NONIUS
Used for single crystal XRD analysis to determine crystal structure and parameters.
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multicrystal X-ray diffractometer
Used for high resolution XRD studies to assess crystalline perfection.
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Shimadzu spectrometer
Shimadzu
Used to record optical transmittance spectra in the UV-visible range.
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Nd:YAG laser
Quanta ray model lab-170-10
Quanta ray
Used for laser damage threshold and second harmonic generation measurements.
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Vickers microhardness tester
Used to measure microhardness of the crystals.
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NETZSCH STA 449 F3 Jupiter
STA 449 F3 Jupiter
NETZSCH
Used for thermogravimetric analysis and differential scanning calorimetry.
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L-Glutamic acid
Analytical grade
Merck
Raw material for synthesizing LGPT crystal.
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p-Toluenesulfonic acid monohydrate
Analytical grade
Merck
Raw material for synthesizing LGPT crystal.
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