14 September 2001 Challenges of laser spectrum metrology in 248- and 193-nm lithography
Author Affiliations +
Abstract
Several approaches for high-resolution laser metrology have been discussed. One approach is to use a multiple-etalon spectrometer, which has two or more etalons with different FSRs. This approache can increase both the resolution at FWHM and the tails, as well as increase the spectrum range of the instrument. With the proper alignment, this multiple etalon configuration can produce an instrument whose resolution is equal to or better than the highest resolution etalon while still maintaining the FSR of the lower resolution etalon. In the configuration tested, a spectrometer designed for 248nm was constructed with a 2pm etalon and a 20pm etalon. The resolution of this multi-pass, multi-etalon (MPME) spectrometer produced an instrument function of 0.086pm FWHM and 0.339pm for the integrated 95% level over an integration range of 20pm. Another approach is to use a combination of diffraction grating and etalon - based spectrometers. In this approach, the etalon provides high resolution for FWHM measurements, while diffraction grating provides accurate measurement of the spectrum tails over the wide scanning range. This idea has been tested with a 193 nm instrument.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexander I. Ershov, Alexander I. Ershov, Scot Smith, Scot Smith, } "Challenges of laser spectrum metrology in 248- and 193-nm lithography", Proc. SPIE 4346, Optical Microlithography XIV, (14 September 2001); doi: 10.1117/12.435657; https://doi.org/10.1117/12.435657
PROCEEDINGS
10 PAGES


SHARE
RELATED CONTENT

An XUV optics beamline at BESSY II
Proceedings of SPIE (September 04 2014)
Advanced VUV spectrometer for F2 laser metrology
Proceedings of SPIE (September 13 2001)
Laser spectrum line shape metrology at 193 nm
Proceedings of SPIE (July 04 2000)
High-resolution spectrometer for TOKAMAK plasma diagnostics
Proceedings of SPIE (September 24 1997)

Back to Top