Browse Prior Art Database

Function Integration on Laser Chips

IP.com Disclosure Number: IPCOM000115665D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Voegeli, O: AUTHOR

Abstract

Planar Beam Deflectors (1) fabricated by means of (2) have been have been integrated on solid state laser chips to deflect the laser beams vertically from the chip. Such deflecting mirrors served to create optical I/O ports at suitable locations about the chip. This invention extends the function of beam deflectors to additionally provide for circularization and astimatic corrections of the laser beam. This is done by giving the deflectors a parabolic shape as can eb accomplished using a similar contour on the mirror etch mask.

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Function Integration on Laser Chips

      Planar Beam Deflectors (1) fabricated by means of (2) have
been have been integrated on solid state laser chips to deflect the
laser beams vertically from the chip.  Such deflecting mirrors served
to create optical I/O ports at suitable locations about the chip.
This invention extends the function of beam deflectors  to
additionally provide for circularization and astimatic corrections of
the laser beam.  This is done by giving the deflectors a parabolic
shape as can eb accomplished using a similar contour on the mirror
etch mask.

      The Figure shows a Ridge-Laser and a parabolic Deflecting
Mirror; (a) in the horizontal x/y plane as viewed looking down onto
the chip; (b) is a vertical crossection in the y/z plane.  The laser
comprises a ridge wave guide terminated by a vertically etched exit
facet.  The Deflecting Mirror has been etched at a 45 degrees angle
using a mask contour with a xsup2=4py curvature.

      The crossection (b) shows the axis of the laser beam rotated by
90º  at the Deflecting Mirror.  Also, depicted are the beam's
source location as viewed from a horizontal and a vertical axis, the
difference being the astigmatic distance lbracket Delta rbracket.
Not shown are the respective beam divergencies whose ratio
(horizontal/vertical) is the beams ellipticity lbracket eta rbracket.

      This invention claims that appropriate amounts of beam
cicularization and astigmatic correction can be a...