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Phase conjugation can be used to correct blurred images caused by atmospheric turbulence and scattering of light by biological tissues. In the past, phase-conjugation devices based on photorefractive effect have response times of 100 µs – 1 s [1]. Four-wave mixing in a third-order nonlinear medium can be also used to achieve optical phase conjugation [2]. This scheme, demonstrated in Ref. [3], requires...
By measuring and comparing the reflection spectra of single crystal and pressed polycrystalline powder of calcium fluoride (CaF2) in the terahertz range, we have demonstrated recovery of polaritonic stopband in the powder. By using a simplified model to fit our data, we have deduced the longitudinal-optical and transverse-optical phonon frequencies and damping parameter for the polariton resonance...
We have demonstrated recovery of polaritonic stop-band in pressed polycrystalline CaF2 powder. Due to small sizes of CaF2 particles, we have observed evidence of severe damping of polaritonic waves at particle surfaces.
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