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Electron Beam Pumped Scanning Laser

IP.com Disclosure Number: IPCOM000094077D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Myers, RA: AUTHOR

Abstract

The apparatus is a scanning laser. One dimensional scan can be controlled by electron beam 10. The laser resonant cavity has its boundaries defined by mirror 11 and the reflecting interface between laser material 12 and larger energy gap material 13. Light emitted by material 12 passes through lens 14 and strikes laser diode 15. To the right of diode 15 the light passes through lens 16 and is reflected by mirror 11.

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Electron Beam Pumped Scanning Laser

The apparatus is a scanning laser. One dimensional scan can be controlled by electron beam 10. The laser resonant cavity has its boundaries defined by mirror 11 and the reflecting interface between laser material 12 and larger energy gap material 13. Light emitted by material 12 passes through lens 14 and strikes laser diode 15. To the right of diode 15 the light passes through lens 16 and is reflected by mirror 11.

In operation, diode 15 is pumped to a point just below the threshold level by an injection current. Beam 10 then strikes material 12 and generates electron- hole pairs. These electron-hole pairs, when they decay, give off photons of light which pass through material 13 and are directed by lens 14 to diode 15. The light generated at material 12 acts to trigger the lasing action of diode 15. Lens 16 and mirror 11 form the other half of the lasing cavity. Material 12 and diode 15 once energized reinforce each other. Thus there is a large gain in the direction defined by the point where beam 10 strikes material 12.

To achieve a scanning motion, beam 10 is moved along a line on material 12 parallel to the junction of diode 15. Where beam 10 strikes material 12, lasing action occurs. Light from material 12 is focused on a portion of the junction of diode 15. Thus different modes of the complete laser, including material 12 and mode 15, can be excited into the lasing mode of operation by moving the electron beam along mate...