Browse Prior Art Database

Use of Self Localized Annealing Under Inert Atmosphere to Extend Lifetime of Quantum Well Lasers

IP.com Disclosure Number: IPCOM000121413D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Rosen, HJ: AUTHOR [+4]

Abstract

This invention pertains to a self localized annealing process to improve the lifetime of semiconductor laser diodes. The presence of defects and imperfections at end facets of semiconductor lasers is known to have detrimental effects on the laser's reliability and lifetime. Annealing (heat treatment) of the laser structure is a possible way to reduce the density of defects. Unfortunately, annealing of the whole structure could induce unwanted dopant diffusion in the laser cavity, thus causing problems in the control of the laser's characteristics.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Use of Self Localized Annealing Under Inert Atmosphere to Extend
Lifetime of Quantum Well Lasers

      This invention pertains to a self localized annealing process
to improve the lifetime of semiconductor laser diodes.  The presence
of defects and imperfections at end facets of semiconductor lasers is
known to have detrimental effects on the laser's reliability and
lifetime.  Annealing (heat treatment) of the laser structure is a
possible way to reduce the density of defects.  Unfortunately,
annealing of the whole structure could induce unwanted dopant
diffusion in the laser cavity, thus causing problems in the control
of the laser's characteristics.

      The novel self localized annealing process proposed here
utilizes the heat generated at the facets intrinsically by the laser
diode operation.  Operation of uncoated samples in an inert
atmospheric condition reduces the speed of facet erosion and thus
allows the laser to operate at a high power level.  The procedure of
the treatment is as follows:
      -    Operate the laser in an inert atmosphere, such as helium
or nitrogen at high power.
      -    After the completion of the localized heat treatment, the
facet can then be passivated by the usual coating to prevent further
surface damages.

      Disclosed anonymously.