The effectiveness of metal coated diffraction gratings at grazing and near normal incidence as harmonic scrubbers
High power free electron lasers (FEL) can produce significant amounts of harmonic radiation. These harmonic components represent a substantial damage threat to the optical elements comprising the laser resonator. In this paper we discuss the merits of using blind gratings in both the paraboloid and grazing incidence hyperboloid mirrors of a 1.06 micron FEL under construction by the Boeing Aerospace Company. Grating designs developed for use at grazing incidence are not very efficient for dispersing harmonics. However, blind gratings positioned in the paraboloid exhibit better filtering capability. 6 refs., 8 figs., 3 tabs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7043982
- Report Number(s):
- LA-UR-88-3148; CONF-880904-1; ON: DE89000359
- Country of Publication:
- United States
- Language:
- English
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