Hong-jun ZHOU, Xuan-zhi XIA, Tong-lin HUO, et al. Distribution and suppression of higher-order harmonics of metrology beamline in 5~140 nm[J]. Optics and precision engineering, 2016, 24(7): 1550-1556.
DOI:
Hong-jun ZHOU, Xuan-zhi XIA, Tong-lin HUO, et al. Distribution and suppression of higher-order harmonics of metrology beamline in 5~140 nm[J]. Optics and precision engineering, 2016, 24(7): 1550-1556. DOI: 10.3788/OPE.20162407.1550.
Distribution and suppression of higher-order harmonics of metrology beamline in 5~140 nm
To correct and improve calibration and measurement precision of optical element performance at 5-140 nm waveband covered by metrology beamline
a scheme for higher-order harmonic suppression was designed based on spectral radiation standard of State Synchrotron Radiation Laboratory and distribution of higher-order harmonic of the metrology beamline. The distribution of the higher-order harmonic of metrology beamline at 5-140 waveband was studied by use of 3500
8401/mm gold-film self-support transmission gratings and a photodiode detector. Thus a method to suppress higher-order harmonics at different wavebands with Si
Al
Al/Mg/Al filter and LiF window and MgF
2
window was put forward. Experimental result shows that the content of higher harmonic without filter is extremely low in 5-15 nm waveband
the proportion of higher-order harmonic with quantum efficiency corrected by detector can be suppressed below 1.8% in 5-40 nm waveband when proper filter is added at the corresponding waveband; LiF window and MgF
2
window can basically make higher-order harmonic proportion zero in 105-140 nm and 115-140 nm wavebands. The scheme for suppression of harmonic waves with filters at whole waveband is effective.
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references
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