Device for focusing a laser on a recording medium by wavelength

Details Device for focusing a laser on a recording medium by wavelength Device for focusing a laser on a recording medium by wavelength

1984-01-18

1986-06-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

045958106

ABSTRACT:
A device for focusing a laser on a recording medium by wavelength modulation is disclosed wherein the device includes a radiation source for providing a radiation beam of controllable frequency, a hologram intercepting the radiation beam for focusing the radiation beam as a function of its frequency, and a control system coupled to the radiation source for controlling the frequency of the radiation beam so as to focus the beam on a desired plane. The control system includes a sensor for detecting the focus of the radiation beam on a desired plane, and means for controlling the frequency of the radiation beam from the radiation source responsive to the detected focus.

REFERENCES:
patent: 4280215 (1981-07-01), Okano
Smith, Modern Optical Engineering, p. 57, 1966.
Latta et al., IBM Tech Bulletin, vol. 22, No. 4, Sep. 1979, Multi-Function Holographic Element for Readout of High Density Recorded Data.

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