23 March 2012 Development of the reliable high power pulsed carbon dioxide laser system for LPP EUV light source
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Abstract
Laser Produced Plasma (LPP) Extreme Ultra Violet (EUV) light source is expected to be used for next generation lithography. To realize such performance for industrial use, the main driver laser is one of the key components. Our source uses a high power pulsed carbon dioxide (CO2) laser as a plasma driver. A master oscillator and a power amplifier (MOPA) system based on a new configuration of an RF-excited CO2 laser is the key to high efficiency. And multiline amplification of CO2 laser is efficient to increase the extraction efficiency in the case of short pulse amplification like this amplification. Numerical result shows the amplification enhancement as 1.3 times higher than the single line amplification. This report shows its initial performance. Multiline configuration is applied to the master oscillator and the efficiency of multiline amplification is verified in our experimental amplifier system. We have achieved 10% energy extraction improvement using 2 lines (P20+P22) as compared to single line (P20).
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Takeshi Ohta, Takeshi Ohta, Krzysztof M. Nowak, Krzysztof M. Nowak, Takashi Suganuma, Takashi Suganuma, Hidenobu Kameda, Hidenobu Kameda, Masato Moriya, Masato Moriya, Toshio Yokoduka, Toshio Yokoduka, Yasufumi Kawasuji, Yasufumi Kawasuji, Junichi Fujimoto, Junichi Fujimoto, Hakaru Mizoguchi, Hakaru Mizoguchi, } "Development of the reliable high power pulsed carbon dioxide laser system for LPP EUV light source", Proc. SPIE 8322, Extreme Ultraviolet (EUV) Lithography III, 83222O (23 March 2012); doi: 10.1117/12.916586; https://doi.org/10.1117/12.916586
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