Abstract
A novel diagnostic system [W.P. Leemans et al., Nucl. Instr. and Meth. A 331 (1993) 615] has been used to measure the micropulse spectra of infrared pulses generated by the free electron laser (FEL) at Stanford University. The diagnostic system makes use of a high resolution 1 m spectrometer, and an imaging system based on an image dissector [H.A. Baldis et al., Rev. Sci. Instr. 48 (1977) 173] and a single element HgCdTe-high speed detector with integrating sphere. Spectra of single and multiple consecutive micropulses at a repetition rate of 11.8 MHz have been obtained for the FEL operating at 5 μm.
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