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首页> 外文期刊>Optical engineering >Potentials of acousto-optical spectrum analysis on a basis of a novel algorithm of the collinear wave heterodyning in a large-aperture KRS-5 crystalline cell
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Potentials of acousto-optical spectrum analysis on a basis of a novel algorithm of the collinear wave heterodyning in a large-aperture KRS-5 crystalline cell

机译：基于大孔径KRS-5晶胞共线波外差的新算法的声光光谱分析潜力

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摘要

The technique under proposal for a precise spectrum analysis within an algorithm of the collinear wave heterodyning implies a two-stage integrated processing, namely, the wave heterodyning of a signal in a square-law nonlinear medium and then the optical processing in the same solid state cell. The technical advantage of this approach lies in providing a direct multichannel parallel processing of ultra-high-frequency radio-wave signals with essentially improved frequency resolution. This technique imposes specific requirements on the cell's material. We focus our attention on the solid solutions of thallium chalcogenides and take the TIBr-TII (thallium bromine-thallium iodine) solution, which forms KRS-5 cubic-symmetry crystals with the mass-ratio 58% of TIBr to 42% of Tll. Analysis shows that the acousto-optical cell made of a KRS-5 crystal oriented along the [111 ]-axis and the corresponding longitudinal elastic mode for producing the dynamic diffractive grating can be exploited. With the acoustic velocity of about 1.92 x 10~5 cm/s and attenuation of ~10 dB/(cm GHz2), a similar cell is capable of providing an optical aperture of ~5.0 cm and one of the highest figures of acousto-optical merit in solid states in the visible range. Such a cell is rather desirable for the application to direct 5000-channel parallel spectrum analysis with an improved up to 10~(-5) relative frequency resolution.
机译：提议用于共线波外差算法中的精确频谱分析的技术意味着两步集成处理，即在平方律非线性介质中对信号进行波外差，然后在相同固态下进行光学处理。细胞。该方法的技术优势在于提供对超高频无线电波信号的直接多通道并行处理，并具有实质上提高的频率分辨率。该技术对电池的材料提出了特殊要求。我们将注意力集中在硫族th的固溶体上，并采用TIBr-TII（th溴-bro碘）溶液，该溶液形成KRS-5立方对称晶体，其质量比为TIBr的58％至Tll的42％。分析表明，可以利用由沿[111]轴取向的KRS-5晶体制成的声光单元以及用于产生动态衍射光栅的相应纵向弹性模式。具有约1.92 x 10〜5 cm / s的声速和〜10 dB /（cm GHz2）的衰减，类似的单元能够提供〜5.0 cm的光学孔径，是声光的最高数值之一在可见光范围内具有固态的优点。这种单元对于直接5000通道并行频谱分析的应用是非常理想的，具有高达10〜（-5）的相对频率分辨率。

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