2:45 PM - 3:00 PM
[20p-431B-5] Operation experiment of a far-field focus servo using a rotational disc one dimensional diffraction grating is embedded
Keywords:focus servo, far-field, collier hologram
We report the experimental verification of a focus sensor using interference fringes in the reflected/diffracted light beams from a periodical one-dimensional structure, which is embeded inside a disc. For this purpose we have improved the jitter of a turntable and a focus-loop has been closed with the focus error signal we obtain.