Development of high-throughput, high-damage-threshold beam separator for 13 nm high-order harmonics |
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Authors: | Nagata Yutaka Nabekawa Yasuo Midorikawa Katsumi |
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Institution: | Laser Technology Laboratory, Saitama, Japan. ynagata@riken.jp |
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Abstract: | We demonstrate a high-throughput, high-damage-threshold beam separator for wavelengths shorter than 30 nm, which uses a 10 nm thick niobium nitrogen film prepared on a Si substrate, set at the Brewster angle relative to the pump wavelength. The film was deposited by rf reactive magnetron sputtering on a Si substrate. The beam separator has an attenuation ratio of 0.01 and a damage-threshold intensity of at least 0.8 TW/cm2 for a 26 fs pump pulse. The measured reflectivity of the beam separator exceeded 70% in a wavelength range of 13-18 nm. This broadband beam separator may be used to eliminate energetic laser pulses from longitudinally pumped x ray lasers as well as from high-order harmonics. |
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