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Abstract

A method and arrangement for producing ultrashort light pulses of tunable wavelength and pulse duration for use in spectroscopy, photobiology and in the medical science comprises a pumping radiation source for producing a substantially coherent radiation. A grating is provided for producing a first and a second partial beam from the coherent radiation which are superimposed in a laser active medium operating to the distributed feedback principle, for generating a laser beam in a first range of the laser active medium. According to the invention a third partial beam is produced at said grating. The third partial beam is fed into the laser active medium into a second range of the same which is either entirely or partially or not at all overlapping said first range. The second range is passed by the laser beam. A tiltable planoparallel plate is inserted into the coherent radiation for displacing the first and second partial beam relative to the third partial beam and, hence, the first and second range. Furthermore, an arrangement is provided to vary the energies in the first and second partial beam relative to that in the third partial beam.

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First Claim