Anisotropy of optical transmission and photoluminescence in ZnIn2S4 and ZnIn2S4: Cu single crystals

2010 ◽  
Vol 46 (6) ◽  
pp. 628-631 ◽  
Author(s):  
V. F. Zhitar ◽  
V. I. Pavlenko ◽  
T. D. Shemyakova
Keyword(s):  
Single Crystals ◽  
Optical Transmission

scholarly journals TEMPERATURE DEPENDENCE OF OPTICAL TRANSMISSION OF GERMANIUM SINGLE CRYSTALS

2021 ◽  
pp. 177-186
Author(s):  
Александра Ивановна Иванова ◽  
Кристина Александровна Мариничева ◽  
Сергей Андреевич Третьяков ◽  
Алексей Михайлович Иванов ◽  
Сергей Вячеславович Молчанов ◽  
...  
Keyword(s):  
Single Crystals ◽  
Optical Transmission ◽  
Crystal Surface ◽  
Attenuation Coefficients ◽  
Temperature Changes ◽  
Temperature Range ◽  
Low Resistance ◽  
Donor And Acceptor ◽  
Helium Neon ◽  
Nanoscale Level

Проведены исследования оптического пропускания в диапазоне длин волн 2 - 14 мкм монокристаллов германия, легированных донорными и акцепторными примесями (удельное сопротивление германия 1 - 3 Ом⋅см), в интервале температур от 86 К до 523 К. Рассчитаны значения коэффициентов ослабления α для исследуемых кристаллов; минимальные значения коэффициентов ослабления (0,0015 - 0,0231 см) в интервале температур от 86 К до 323 К характерны для монокристаллов германия, легированных сурьмой, в диапазоне 2 - 11 мкм. Исследования показали, что низкие значения α и коэффициента пропускания на длине волны 3,39 мкм для кристаллов Ge: Sb и Ge: Bi позволяют применять эти низкоомные кристаллы германия для газовых гелий-неоновых лазеров при температурах от 86 К до 323 К. Исследованы температурные изменения геометрии поверхности кристалла на наноразмерном уровне. Показано, что нагрев кристаллического германия приводит к увеличению диффузного отражения излучения от поверхности. Сделан вывод о возможности использования низкоомных кристаллов германия, легированных сурьмой, в качестве элементов инфракрасной оптики в интервале температур 86 - 373 К. In this work, we investigated optical transmission in the wavelength range of 2-14 μm of low-resistance germanium crystals (1 - 3 Ω⋅cm) doped with donor and acceptor impurities in the temperature range from 86 K to 523 K. The values of the attenuation coefficients for investigated crystals are obtained. Minimum attenuation coefficients α of 0,0015 - 00231 cm in the temperature range from 86 K to 323 K are characteristic for germanium single crystals doped with antimony in the range 2,1-11 μm. Studies have shown that the low values of α and the transmittance at a wavelength of 3,39 pm for Ge: Bi and Ge: Sb crystals make it possible to use these low-resistance germanium crystals for gas helium-neon lasers at temperatures from 86 K to 323 K. The temperature changes in the geometry of the crystal surface are investigated at the nanoscale level. It is shown that heating crystalline germanium leads to an increase in the diffuse reflection of radiation from the surface. The possibility of using the low-resistance germanium crystals doped with antimony as elements of infrared optics in the temperature range 86 - 373 K has been demonstrated.

Optical and Raman spectra of single crystals of perylene-TCNQ charge transfer complexes

1982 ◽  
Vol 60 (5) ◽  
pp. 588-595 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
C. Carlone
Keyword(s):  
Raman Spectrum ◽  
Charge Transfer ◽  
Single Crystals ◽  
Raman Spectra ◽  
Optical Transmission ◽  
Charge Transfer Complexes ◽  
One Dimensional ◽  
Resonance Enhancement ◽  
First Time ◽  
Transmission And Reflection

Optical transmission and reflection measurements are reported for the quasi one dimensional solids perylene-TCNQ (P1T1) and (perylene)3-TCNQ (P3T1) in the region from 300 to 1200 nm. Raman spectra of single crystals of both compounds were obtained from 20 to 3000 cm−1. With 457.9 nm excitation, combinations and overtones of perylene are observed for the first time. A complete Raman spectrum of perylene and its deuterated homologue including librations is thus obtained via selective resonance enhancement of that molecule.

scholarly journals Growth, structural, thermal and optical properties of Mg2+ -Co2+ doped potassium acid phthalate crystals

2014 ◽  
Vol 37 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Mostak Hossain ◽  
Shahan Ara Begum ◽  
Jiban Podder
Keyword(s):  
Single Crystals ◽  
Optical Transmission ◽  
Vital Role ◽  
Secondary Nucleation ◽  
Optically Transparent ◽  
Isothermal Evaporation ◽  
Potassium Acid Phthalate ◽  
Academy Of Sciences ◽  
Co Doped ◽  
Acid Phthalate

Single crystals of pure potassium acid phthalate (KAP) and magnesium-cobalt (Mg2+-Co2+) co-doped potassium acid phthalate crystals were grown by an isothermal evaporation method. Optically transparent and coloured KAP single crystals were grown by doping divalent bimetallic impurities. Enhancement of the metastable zonewidth was achieved by the addition of co-doped bimetallic impurities in KAP solution. It is anticipated that these larger cations play a vital role in the growth mechanism and it favours to reduce the formation of secondary nucleation by positioning the doped metal ions into the interstitial sites. The XRD results confirm that the incorporation of bimetallic ions into the KAP crystal lattice. The optical transmission is found to decrease in Mg-Co doped crystals compared to that of pure KAP. DOI: http://dx.doi.org/10.3329/jbas.v37i2.17557 Journal of Bangladesh Academy of Sciences, Vol. 37, No. 2, 165-172, 2013

Growth and Characterization of Zinc Doped L-Proline Cadmium Chloride Single Crystals

2012 ◽  
Vol 584 ◽  
pp. 60-64
Author(s):  
S. Vetrivel ◽  
R. Rajasekaran
Keyword(s):  
Single Crystals ◽  
Cadmium Chloride ◽  
Room Temperature ◽  
Optical Transmission ◽  
Second Harmonic ◽  
Wavelength Region ◽  
Nlo Property ◽  
Crystalline Nature ◽  
Xrd Patterns

Single Crystals of 20% of Zinc doped L- Proline Cadmium chloride [Zn(20M):LPCC] and 40% of Zinc doped L-Proline Cadmium chloride[Zn(40M):LPCC]were successfully grown from aqueous solution by slow evaporation method at room temperature. The grown crystals of [Zn(20M):LPCC] and [Zn(40M):LPCC] have dimensions 47x14x3.7 mm3 and 36x9.5x4.2 mm3 respectively. The single crystal XRD, powder XRD patterns were recorded and indexed for crystalline nature of grown materials. The presence of functional group has been confirmed by FTIR analysis. The optical transmission spectrum has been recorded in wavelength region 100nm to1000nm.The thermal properties were studied by TGA/DTA. The second harmonic generation (SHG) was carried out and it reveals the NLO property of the crystals. The electrical properties were studied by dielectric studies.

The temperature dependence of the electrical conductivity and switching phenomena in Cu2O single crystals

1982 ◽  
Vol 60 (11) ◽  
pp. 1648-1655 ◽  
Author(s):  
G. J. Wang ◽  
F. L. Weichman
Keyword(s):  
Electrical Conductivity ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Electric Fields ◽  
Optical Transmission ◽  
Current Voltage ◽  
High Electric Fields ◽  
Optically Induced

Optical transmission work had shown that three distinct types of Cu2O single crystals could be created by means of different annealing processes. We have now made mobility measurements and a series of current–voltage measurements over the ambient to 200 °C range. All types of crystals were subject to breakdown at sufficiently high electric fields and temperatures in accordance with a previously known mechanism. Two new switching effeets, one of which is optically induced, are shown to exist in the highest resistivity material.

scholarly journals Fabrication and Electrical Characterization of Translucent Bi12TiO20Ceramics

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
D. J. Santos ◽  
L. B. Barbosa ◽  
R. S. Silva ◽  
Z. S. Macedo
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Dielectric Properties ◽  
Single Crystals ◽  
Optical Transmission ◽  
Electrical Characterization ◽  
High Density ◽  
Average Grain Size ◽  
Electrical And Dielectric Properties

The production of high-density Bi12TiO20ceramics, their transmission spectrum, and impedance features are reported. The samples were synthesized at 700°C/6 h and sintered at 800°C/3 h. This procedure yielded translucent ceramics with relative density of99.2±0.5% and average grain size of3.1±1.6 μm. Samples with 0.5 mm thickness were translucent with optical transmission of about 30% at 800 nm. The electrical and dielectric properties of the high-density ceramics were studied and compared with those measured for samples with lower density and also with the literature about Bi12TiO20single crystals. The activation energy for the conduction process in high-density ceramic was 0.99 eV, and the dielectric permittivity was 40 at 200°C. These values are comparable to those reported for single crystals.

Optical transmission spectra of Na0.4R0.6F2.2 single crystals with fluorite structure

2001 ◽  
Author(s):  
Antonina P. Shtyrkova ◽  
Tatiana M. Glushkova ◽  
Marina M. Firsova ◽  
Dmitrii F. Kiselev ◽  
Elena A. Krivandina ◽  
...  
Keyword(s):  
Single Crystals ◽  
Optical Transmission ◽  
Fluorite Structure ◽  
Transmission Spectra ◽  
Optical Transmission Spectra
Sign in / Sign up

Export Citation Format

Share Document