发明名称 |
Hologram recording and reproducing device and method for recording hologram |
摘要 |
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. |
申请公布号 |
US8194517(B2) |
申请公布日期 |
2012.06.05 |
申请号 |
US201113170623 |
申请日期 |
2011.06.28 |
申请人 |
OKADA HITOSHI;TANAKA TOMIJI;TAKEDA TAKAHIRO;SONY CORPORATION |
发明人 |
OKADA HITOSHI;TANAKA TOMIJI;TAKEDA TAKAHIRO |
分类号 |
G11B11/00 |
主分类号 |
G11B11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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