Littrow-type external-cavity blue laser for holographic data storage.
An external-cavity laser with a wavelength of 405 nm and an output of 80 mW has been developed for holographic data storage. The laser has three states: the first is a perfect single mode, whose coherent length is 14 m; the second is a three-mode state with a coherent length of 3 mm; and the third is a six-mode state with a coherent length of 0.3 mm. The first and second states are available for angular-multiplexing recording; all states are available for coaxial multiplexing recording. Due to its short wavelength, the recording density is higher than that of a 532 nm laser.
Tanaka
Tomiji
T
Tera Bytes Memory Development Department, Core Technology Development Group, Sony Corporation, Kitashinagawa-ku Tokyo, Japan. tomiji.tanaka@jp.sony.com
Takahashi
Kazuo
K
Sako
Kageyasu
K
Kasegawa
Ryo
R
Toishi
Mitsuru
M
Watanabe
Kenjiro
K
Samuels
David
D
Takeya
Motonobu
M