Browse Prior Art Database

Two Dimensional Scan Laser

IP.com Disclosure Number: IPCOM000093948D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Garwin, RL: AUTHOR

Abstract

Laser beams can be directionally controlled for scanning purposes by controlling the direction of resonance in the lasing cavity. Active lasing medium 10 is a ruby which is excited by pumping light. The light emitted from ruby 10 is polarized by polarizer 12 and passes through a quarter-wave plate 14. The resonant cavity is defined by mirrors 16 and 18. In addition, electro-optical strips are mounted on the surface of mirror 18. A first layer of strips 20 is vertically orientated. A second layer of strips 22 is horizontally orientated.

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Two Dimensional Scan Laser

Laser beams can be directionally controlled for scanning purposes by controlling the direction of resonance in the lasing cavity. Active lasing medium 10 is a ruby which is excited by pumping light. The light emitted from ruby 10 is polarized by polarizer 12 and passes through a quarter-wave plate 14. The resonant cavity is defined by mirrors 16 and 18. In addition, electro-optical strips are mounted on the surface of mirror 18. A first layer of strips 20 is vertically orientated. A second layer of strips 22 is horizontally orientated.

A normal resonant cavity would be defined by ruby 10 active in the cavity formed by mirrors 16 and 18. The other elements shown in the apparatus two- dimensionally select that portion of the cavity which goes into resonance. In this way, the direction of the lasing beam from the cavity is controlled.

In operation, the beam from ruby 10 is polarized by polarizer 12. The polarized beam then passes through quarter-wave plate 14 and into electro- optical layers 20 and 22. If there is no electrical energization of layers 20 and 22, the polarization of the beam from plate 14 is of such an angle that most of the light is absorbed by layers 20 and 22 and does not reach mirror 18. However, when a segment of the electro-optical material is electrically energized, it provides one-eighth wave of phase retardation on a single traverse by the light wave. Thus if a horizontal segment and a vertical segment are both ener...