ФОКУСИРОВКА ИЗЛУЧЕНИЯ ЛАЗЕРА ТЕРАГЕРЦОВОГО ДИАПАЗОНА (NOVOFEL) В СООСНЫЙ ОТРЕЗОК

A binary silicon diffractive optical element (DOE) focusing laser radiation onto an axial segment (or a DOE with elongated focal depth) for the terahertz spectral range has been designed and characterized using terahertz radiation of the Novosibirsk Free Electron Laser (NovoFEL).