Laser-plasma generation of tunable ultrashort pulses in terahertz and mid-infrared ranges

摘要

The generation of tunable ultrashort pulses in the terahertz (THz) and mid-infrared (mid-IR) ranges is an important problem of both fundamental interest and for many applications. In particular, such sources are required for the observation of ultrafast electronic and vibrational dynamics in a wide class of materials [1]. Such sources are also of interest because of the possibilities of spectroscopy and diagnostics of various media [2]. Apart from this, the use of intense ultrashort pulses in the mid-IR range with controlled phase for the generation of high harmonics makes it possible to reach the short-wave region of the soft X- ray range and to obtain ultrashort attosecond pulses [3].