Frequency-tunable sub-two-cycle 60-MW-peak-power free-space waveforms in the mid-infrared.

Optics letters

PubMedID: 25490486

Lanin AA, Voronin AA, Stepanov EA, Fedotov AB, Zheltikov AM. Frequency-tunable sub-two-cycle 60-MW-peak-power free-space waveforms in the mid-infrared. Opt Lett. 2014;39(22):6430-6433.
A physical scenario whereby freely propagating mid-infrared pulses can be compressed to pulse widths close to the field cycle is identified. Generation of tunable few-cycle pulses in the wavelength range from 4.2 to 6.8 µm is demonstrated at a 1-kHz repetition rate through self-focusing-assisted spectral broadening in a normally dispersive, highly nonlinear semiconductor material, followed by pulse compression in the regime of anomalous dispersion, where the dispersion-induced phase shift is finely tuned by adjusting the overall thickness of anomalously dispersive components. Sub-two-cycle pulses with a peak power up to 60 MW are generated in the range of central wavelengths tunable from 5.9 to 6.3 µm.