Multi-mW, few-cycle mid-infrared continuum spanning from 500 to 2250?cm-1.

ABSTRACT: The demand for and usage of broadband coherent mid-infrared sources, such as those provided by synchrotron facilities, are growing. Since most organic molecules exhibit characteristic vibrational modes in the wavelength range between 500 and 4000?cm-1, such broadband coherent sources enable micro- or even nano-spectroscopic applications at or below the diffraction limit with a high signal-to-noise ratio1, 2, 3. These techniques have been applied in diverse fields ranging from life sciences, material analysis, and time-resolved spectroscopy. Here we demonstrate a broadband, coherent and intrinsically carrier-envelope-phase-stable source with a spectrum spanning from 500 to 2250?cm-1 (-30?dB) at an average power of 24?mW and a repetition rate of 77?MHz. This performance is enabled by the first mode-locked thin-disk oscillator operating at 2??m wavelength, providing a tenfold increase in average power over femtosecond oscillators previously demonstrated in this wavelength range4. Multi-octave spectral coverage from this compact and power-scalable system opens up a range of time- and frequency-domain spectroscopic applications.

SUBMITTER: Zhang J 

PROVIDER: S-EPMC6060060 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature