Opacity effect on extreme ultraviolet radiation from laser-produced tin plasmas.
Opacity effects on extreme ultraviolet (EUV) emission from laser-produced tin (Sn) plasma have been experimentally investigated. An absorption spectrum of a uniform Sn plasma generated by thermal x rays has been measured in the EUV range (9-19 nm wavelength) for the first time. Experimental results indicate that control of the optical depth of the laser-produced Sn plasma is essential for obtaining high conversion to 13.5 nm-wavelength EUV radiation; 1.8% of the conversion efficiency was attained with the use of 2.2 ns laser pulses.
Fujioka
Shinsuke
S
Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka 565-0871, Japan. sfujioka@ile.osaka-u.ac.jp
Nishimura
Hiroaki
H
Nishihara
Katsunobu
K
Sasaki
Akira
A
Sunahara
Atsushi
A
Okuno
Tomoharu
T
Ueda
Nobuyoshi
N
Ando
Tsuyoshi
T
Tao
Yezheng
Y
Shimada
Yoshinori
Y
Hashimoto
Kazuhisa
K
Yamaura
Michiteru
M
Shigemori
Keisuke
K
Nakai
Mitsuo
M
Nagai
Keiji
K
Norimatsu
Takayoshi
T
Nishikawa
Takeshi
T
Miyanaga
Noriaki
N
Izawa
Yasukazu
Y
Mima
Kunioki
K