Abstract
We report on the generation of high-energy (1.9μJ) far-infrared pulses tunable between 4 and 18THz frequency. Emphasis is placed on tunability and on minimizing the bandwidth of these pulses to less than 1THz, as achieved by difference-frequency mixing of two linearly chirped near-infrared pulses in the organic nonlinear crystal DSTMS. As the two near-infrared pulses are derived from amplification of the same white light continuum, their carrier envelope phase fluctuations are mutually correlated, and hence the difference-frequency THz field exhibits absolute phase stability. This source opens up new possibilities for the control of condensed matter and chemical systems by selective excitation of low-energy modes in a frequency range that has, to date, been difficult to access.
Highlights
Many applications in femtosecond optical science require that one is able to generate highenergy pulses in the range between 1 and 20 THz
We present the generation of far-infrared narrowband carrier-envelope phase-stable pulses achieved by different frequency generation (DFG) between two chirped nearinfrared pulses in a DSTMS organic crystal
The near-IR beams were collimated to diameters of ~2 mm, keeping the fluence incident on the DSTMS crystal below its damage threshold of 150 GW/cm2
Summary
Many applications in femtosecond optical science require that one is able to generate highenergy pulses in the range between 1 and 20 THz. For example, one of the most interesting areas of condensed matter research in the past few years has been the use of THz light to control lattice vibrations [1] and with that the functionality of many correlated electron materials like, e.g., high-temperature superconductors [2]. The lack of powerful sources with frequencies
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