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Internal Modulation of Injection Lasers Using Acoustic Waves

IP.com Disclosure Number: IPCOM000074700D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Harris, EP: AUTHOR [+3]

Abstract

This is a technique for internally modulating the output of injection lasers by using acoustic waves. Injection laser 22 consists of a semiconductor material 10, a p-n junction 12 and electrodes 14a and 14b for applying pumping energy. Mirrors 21 on surfaces 18 and 20 provide an angularly degenerate cavity

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Internal Modulation of Injection Lasers Using Acoustic Waves

This is a technique for internally modulating the output of injection lasers by using acoustic waves. Injection laser 22 consists of a semiconductor material 10, a p-n junction 12 and electrodes 14a and 14b for applying pumping energy. Mirrors 21 on surfaces 18 and 20 provide an angularly degenerate cavity

Acoustic waves are produced near surface 24 by transducers 26 which are connected to excitation means 28. Waves are launched into a small area of the laser which includes the active region. Means 28 can be either a variable frequency voltage source or be connected to a phase shifter for changing-the direction of the acoustic wavefronts 30.

Wavefronts 30 initially propagate in the X direction. The laser output lambda is in the Z direction. When wavefronts 30 are steered through an angle theta, the output his also deflected by an angle theta. Complete spatial modulation of the laser output is thus achieved by steering the acoustic wavefronts.

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