Abstract
We have demonstrated the generation of circularly polarized coherent light pulses at 66 nm wavelength by combining laser seeding at 263 nm of a 375 MeV relativistic electron bunch with subsequent coherent harmonic generation from an elliptical undulator of APPLE-II type. Coherent pulses at higher harmonics in linear polarization have been produced and recorded up to the sixth order (44 nm). The duration of the generated pulses depends on the temporal overlap of the initial seed laser pulse and the electron bunch and was on the order of 200 fs. Currently, this setup is the only source worldwide producing coherent fs-light pulses with variable polarization in the vacuum ultraviolet.
Highlights
Brilliant synchrotron radiation as produced in third generation storage rings is used in many user facilities worldwide featuring polarization control of the radiation using elliptical undulators
coherent harmonic generation (CHG) was observed in the linear mode of the radiator at all harmonics of the seed laser up to 6th (44 nm) at bunch charges of 25 pC and 2 Hz repetition rate
Single shot spectra taken at the 2nd harmonic (131 nm) in circular mode of the radiator are depicted in Fig. 3 revealing that a coherent signal occurs at every shot but with fluctuating intensity
Summary
Brilliant synchrotron radiation as produced in third generation storage rings is used in many user facilities worldwide featuring polarization control of the radiation using elliptical undulators. In the vacuum ultraviolet (VUV) and x-ray regime the synchrotron radiation is only partially coherent transversely, and multiparticle (gain) effects are nonexistent. Time resolved measurements are limited by the electron bunch length of typically 10–100 ps. The pulse duration can be further reduced with slicing techniques, where only a part of the bunch charge is used [2,3]. These pulses are temporally incoherent and the photon flux is limited
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