An optical printhead for a medium including material that forms an optically visible spot in response to energy of a predetermined wavelength, the optical printhead includes a laser configured to impart energy of the predetermined wavelength to the material through a fixed-focus lens arrangement.

 
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< Encoder spokes detection prior to forming image on optically writable label surface of optical disc

< Reflective holographic storage media with control information in underlying DVD reflective layer

> Security element and method for producing same

> Solid-state laser device with a crystal array
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