A novel integrated catadioptric pick-up with ferrofluid cooling structure

Kazuhiko Yamanaka*, Takuya Okuda, Tomoaki Tojo, Shinnich Ijima, Kazutoshi Onozawa, Daisuke Ueda, Junichi Kubo, Seiichiro Kitagawa

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


We propose an integrated catadioptric pick-up (ICPU) with ferrofluid cooling structure for optical disks like DVD. An objective lens and a holographic optical element (HOE) are integrated into a single optical element, called holographic catadioptric lens (HCL). This enables the integration of all optical components including a laser diode (LD) into a moving part of the ICPU. The gaps between the moving part and the fixed optical base are filled with a high-thermal-conductivity ferrofluid, which is supported by magnetic field. With this configuration, Joule heat generated in the moving part is effectively dissipated to the optical base through the ferrofluid without sacrificing the motion of the moving part for its fluidity. The optical characteristics and the cooling performances are applicable to the future extremely small optical disk systems.

Original languageEnglish
Pages (from-to)90-98
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 16 Aug 2004
EventAdvanced Optical and Quantum Memories and Computing - San Jose, CA, United States
Duration: 27 Jan 200428 Jan 2004


  • Catadioptric system
  • Cooling structure
  • Ferrofluid
  • Optical pick-up
  • Super resolution
  • Thermal conductivity

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