Isotropic point in CdGa2S4
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ZHITAR, V, ARAMĂ, Efim, SHEMYAKOVA, Tatiana. Isotropic point in CdGa2S4. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 116.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Isotropic point in CdGa2S4


Pag. 116-116

Zhitar V1, Aramă Efim2, Shemyakova Tatiana1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 ”Nicolae Testemițanu” State University of Medicine and Pharmacy
 
Disponibil în IBN: 4 martie 2019


Rezumat

Optical birefringent filters are used in various fields of science and technology. They are used now for tuning dye lasers and in optical collllllunications. One of the advantages of birefringent filters is the ease with which they can be tuned. Another advantage of birefringent filters is the large field of view that it is possible to obtain. Cadmium thiogallate (CdGa2S4) belongs to the family of semiconductors with defect chalcopyrite tetragonal strncture, and it is an impo1iant material with potential application to the optoelectronic devices because of its llllllinescent prope1iies in the visible region. The CdGa2S4 single crystals are also promising for applications in optical filters and nonlinear optical devices. A naiTow band optical filter was developed on the basis of cadmilllll thiogallate single c1ystal. This filter with the passband less than 2 run and transmittance in the maximum of spectral characteristics of 48% is highly resistant to laser radiation (3.2 x 1011 W/m2) and is a unique device, which can be used in vai·ious domains of science and engineering. In paiiicular, it can be used in gas analyzers using optical principles and can be recommended as an effective transducer for sho1i wave radiation. The isotropic point is associated with the space dispersion of dielectric constant c( v, R) due to tetrahedral disto1iions. The experimentally detennined at T = 293 K position of the isotropic point vai·ies in CdGa2S4 in the range of 487.2 - 489.0 nm; this can be associated with variations in the stoichiometric composition. The nanow band optic filter functions using the prope1iies of the polai·izer - c1ystal - analizer (PCA) system. Actually the filter involves a CdGa2S4 plate cut in the [110] direction placed between the crossed polaroids. The angle between the plane of polarization and the optical axis of the crystal amounts to 45 It was found out that the isotropic point position in the single c1ystals vai·ies in the range from 450 to 580 nm and can be approximated by the expression A0 = 1.737 X 104 T2 + 7.44 X 10-2 T + 449. The following filter's parameters were detennined experimentally. The spectral characteristic of the filter is shown in the Figure. The halfwidth of the passband amounts to ti') .. = 1.0 - 1.5 run; the maximum transmittance is 48%; the range of temperature tuning is within 450 - 580 nm. The filter transmittance can be simply and effectively varied by changing the position of components in the PCA system relative to the filter axis. The filter's structure is simple; it exhibits a wide tuning passband of 450 - 610 nm and a wide field­of-view. This is promising for its practical application.