Browse Prior Art Database

Polarization Junction Laser

IP.com Disclosure Number: IPCOM000077126D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Wieder, H: AUTHOR

Abstract

This is a junction laser which provides a light beam essentially polarized in a unique plane.

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Polarization Junction Laser

This is a junction laser which provides a light beam essentially polarized in a unique plane.

A first lasing element 5 and a second lasing element 6, having substantially the same index of refraction, are spaced from each other by spacing elements 7 and are inclined to a common Brewster angle. The non-common external faces 9 and 8 are parallel to each other to provide a Fabry-Perot resonator. Means for pulsing simultaneously both elements 5 and 6 are not shown. Element 5 is a multichannel junction laser including N-type gallium arsenide base 1 and a series of P-type regions 2 diffused therein. Element 6 includes an N-type gallium arsenide base 4 completely covered by a P-type layer diffused therein. Brewster angle for gallium arsenide is about 15 degrees. Brewster angle surface 11 of element 5 and Brewster angle surface 10 of element 6 are spaced at some wavelength, to permit the Brewster effect to occur With minimum diffraction losses.

With reference to channel 15, light generated in it and emerging from surface 9 contains components in and perpendicular to the plane of incidence, thus it is not polarized in any particular direction. Light generated in channel 15 and travelling in the direction of arrow 16 encounters surface 11. The component of the beam in the plane of incidence is totally transmitted through the surface, while a significant amount of the beam component perpendicular to the plane of incidence is reflected back into e...