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Because their phase can be compensated by a grating-based stretcher compressor and further controlled by RF injection, quantum cascade laser based optical frequency comb generation allowed the generation of pulse as short as 630fs after compression, value confirmed using an upconversion technique with a sub-picosecond time resolution. Another possibility is the direct generation of optical solitons using ring quantum cascade lasers in which, by using a very low lateral loss waveguide, the symmetric counter-propagating modes undergo a spontaneous symmetry breaking and generate solitons.
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