Blu-ray Disc/DVD Compa tible Optical Slim Pickup for Video Camera Drives

Yamazaki, Keiji; Mori, Hiromu; Kawamura, T.; Kitada, Yuhei; Kamisada, T.

doi:10.1109/icce.2008.4588035

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Until now, SA compensation has been achieved by shifting the collimator lens by defocusing the laser beam (i.e., changing the degree of convergence or divergence) incident on the objective lens. 3) A defocus aberration of 6.3 RMS was required to compensate the spherical aberration for the four recording layers of an optical disc based on the BDXLÔ specifications. Moreover, the optical unit used to shift the collimator lens requires a lot of space in an optical pickup.…”

Section: Introductionmentioning

confidence: 99%

Non-contact Deformable Mirror Actuator for Spherical Aberration Compensation

Hashizume¹,

Ide

Kanamaru³

et al. 2011

Jpn. J. Appl. Phys.

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We have proposed and demonstrated a novel non-contact electromagnetic deformable mirror actuator for spherical aberration compensation with simple configurations. The magnetic ring with low stiffness placed on a mirror deformed the mirror into an ideal parabolic shape by applying a magnetic force generated from an electromagnet underneath. We were able to control the deformation of the mirror by adjusting the applied voltage. The maximum deviation from ideal shape was less than 30 nm. In addition, a continuous change of the defocus aberration proportional to the 1.5-RMS /m deformation of the mirror was achieved. #

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Section: Introductionmentioning

confidence: 99%

Non-contact Deformable Mirror Actuator for Spherical Aberration Compensation

Hashizume¹,

Ide

Kanamaru³

et al. 2011

Jpn. J. Appl. Phys.

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Optical trapping at low numerical aperture

Stallinga¹

2011

J. Eur. Opt. Soc.-Rapid Publ.

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A theory of optical trapping at low Numerical Aperture (NA) is presented. The theory offers an analytical description of the competition between the stabilizing gradient and destabilizing scattering force. The trade-off can be characterized by a single dimensionless trapping parameter, which increases with bead radius to wavelength ratio a/λ and refractive index contrast m and decreases with NA. The gradient force dominates for small trapping parameters, the scattering force for large trapping parameters. The potential well depth, maximum forces and trap stiffness as a function of the three parameters (a/λ, m, NA) can be mapped onto universal functions of the trapping parameter. These functions do not depend on any free parameter. The universal well depth and maximum force curves match with numerical results based on the exact multipole expansion of the optical trapping force. The paraxial limit of low NA is relevant for compact optical tweezers based on Optical Pickup Units known from optical data storage.

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Blu-ray Disc/DVD Compa tible Optical Slim Pickup for Video Camera Drives

Cited by 2 publications

References 2 publications

Non-contact Deformable Mirror Actuator for Spherical Aberration Compensation

Non-contact Deformable Mirror Actuator for Spherical Aberration Compensation

Optical trapping at low numerical aperture

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