title: Tunable blue laser compensates for thermal expansion of the medium in holographic data storage.
abstract: A tunable laser optical source equipped with wavelength and mode-hop monitors was developed to compensate for thermal expansion of the medium in holographic data storage. The laser's tunable range is 402-409 nm, and supplying 90 mA of laser diode current provides an output power greater than 40 mW. The aberration of output light is less than 0.05 lambdarms. The temperature range within which the laser can compensate for thermal expansion of the medium is estimated based on the tunable range, which is +/-13.5 degrees C for glass substrates and +/-17.5 degrees C for amorphous polyolefin substrates.
authors.affiliation: Tera Bytes Memory Development Department, Core Technology Development Group, Sony Corporation, 5-1-12 Kitashinagawa, Tokyo 141-0001, Japan. tomiji.tanaka@jp.sony.com
authors.forename: Tomiji
authors.initials: T
authors.lastname: Tanaka
authors.forename: Kageyasu
authors.initials: K
authors.lastname: Sako
authors.forename: Ryo
authors.initials: R
authors.lastname: Kasegawa
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Toishi
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Watanabe