Hologram recording and reproducing device and method for...

Details Hologram recording and reproducing device and method for... Hologram recording and reproducing device and method for...

2011-06-28

2011-06-28

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S103000, C369S116000, C369S121000

Reexamination Certificate

active

07969846

ABSTRACT:
A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a laser diode controller. The external cavity laser has a laser diode adapted to emit an optical beam that is used to generate data light and reference light with which a hologram recording medium is irradiated. The photodiode detects the amount of the optical beam output from the external cavity laser. The laser drive circuit supplies a current to the external cavity laser. The laser diode controller controls the laser drive circuit to ensure that a value obtained by integrating the detected intensity of the optical beam with respect to time over a predetermined period is equal to predetermined recording energy.

REFERENCES:
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patent: 2006/0114535 (2006-06-01), Sako
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Tanaka et al., “Littrow-type external-cavity blue laser for holographic data storage”, Appl. Opt. vol. 46 No. 17, pp. 3583-3592 (Jun. 10, 2007).

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