A holographic recording medium includes a transparent layer having a servo surface and a light incidence surface which face each other; a reflecting layer formed on the servo surface-side transparent layer; and a holographic recording layer formed on the light illuminating-side transparent layer. The transparent layer includes resin films laminated so that adjacent resin films differ in stretching direction by 90 degrees.

 
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< Edge-emitting type semiconductor laser

< Subcutaneously implantable power supply

> Optical head device having a plurality of optical elements with various transmission efficiencies

> Semiconductor laser module

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