Two-colour operation of a Free-Electron Laser and applications in the mid-infrared
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The two-colour operation of a Free-Electron Laser (FEL) has been demonstrated with the “CLIO” infrared facility. A two section undulator allows the production of picosecond laser pulses at two different wavelengths \(\) and \(\) simultaneously, in a wavelength range from \(\) to \(\), and with a wavelength separation of two colours of up to \(\). The time overlap, between both colours, has been measured on a picosecond time scale and on a microsecond time scale. An initial pump-probe application experiment has been performed with the two colours: stimulated emission has been measured in a 3-level Quantum-Well system. This is the best demonstration of the stability and reliability of the two-colour laser operation.
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