26 June 2003 Spectral dynamics analysis of utlra-line-narrowed F2 laser
Author Affiliations +
Abstract
We have developed an ultra-line-narrowed, high-repetition-rate, high-power injection-locked F2 laser system for 157 nm dioptric projection systems under the ASET project “F2 Laser Lithography Development Project”. A spectral bandwidth of < 0.2 pm (FWHM), an output power of > 25 W, and an energy stability (3-sigma) of < 10 % at 5 kHz repetition rate was successfully obtained by using a low-power ultra-line-narrowed oscillator laser and a high-gain multi-pass amplifier laser. These parameters satisfy the requirements of exposure tools. A numerical simulation code that can simulate the spectral dynamics of the F2 laser under different operation modes such as free running operation, line-narrowed operation, and injection-locked operation, has also been developed. Using this simulation code, it is found that the instantaneous spectral bandwidth narrows monotonously during the laser pulse, and a narrower spectral output can be obtained by seeding the tail area of the line-narrowed F2 laser pulse. And the line-narrowing operation of the oscillator laser and the behavior of the injection-locked laser system can be predicted very precisely with this simulation code. The development of F2 laser for microlithography will be accelerated by this new simulation code.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Takahito Kumazaki, Osamu Wakabayashi, Ryoichi Nohdomi, Tatsuya Ariga, Hidenori Watanabe, Kazuaki Hotta, Hakaru Mizoguchi, Hiroki Tanaka, Akihiko Takahashi, Tatsuo Okada, "Spectral dynamics analysis of utlra-line-narrowed F2 laser", Proc. SPIE 5040, Optical Microlithography XVI, (26 June 2003); doi: 10.1117/12.485381; https://doi.org/10.1117/12.485381
PROCEEDINGS
8 PAGES


SHARE
Back to Top