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The theoretical calculations predicted shift of the absorption spectra of DNA solution in lower frequencies from B- to A-form. The experiments were carried out for DNA dissolved in water and 25% ethanol. Two different technique, THz time domain spectroscopy and THz ellipsometry at NovoFEL facility, were applied for measuring difference in dielectrical properties caused by conformational transmission.
Diffractive optical elements (polypropylene kinoform diffractive lenses, silicon binary diffractive lenses, and silicon beamsplitters) for the terahertz spectral range have been designed and characterized using high-power terahertz radiation of Novosibirsk free electron laser. The effect of an antireflection coating on the silicon elements was studied.
The Novosibirsk FEL (NovoFEL) generates tunable monochromatic coherent radiation as a continuous stream of 100-ps pulses with a repetition rate of up to 11.2 MHz and average power of up to 500 W. After commissioning of the second laser resonator in 2010, the spectral ranges of 120–240 μm and 40–80 μm are available to users. A review of experimental results for the past year is given.
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