METHOD AND APPARATUS FOR ALIGNING A LASER DIODE ON A SLIDER STRUCTURE
An apparatus includes a slider structure having a top surface and a bottom surface opposite from the top surface. The apparatus includes a waveguide with an input facet at the top surface and an output proximate the bottom surface. A laser having an output facet is positioned proximate the input facet of the waveguide and include a second plurality of pads facing a first plurality of pads on the top surface of the slider. A bonding material is disposed between individual ones of the first and second plurality of pads such that a reflow of the bonding material induces relative movement between the laser and the top surface to align the input and output facets.
1 . An apparatus comprising:
a slider structure including a top surface and a bottom surface opposite from the top surface, wherein the slider structure includes a waveguide having an input facet at the top surface and an output proximate the bottom surface, and wherein the slider structure includes a first plurality of pads on the top surface;
a laser having an output facet positioned proximate the input facet of the waveguide, wherein the laser further includes a second plurality of pads facing the first plurality of pads; and
a bonding material disposed between individual ones of the first and second plurality of pads such that a reflow of the bonding material induces relative movement between the laser and the top surface to align the input and output facets.
2 . The apparatus of claim 1 , wherein the laser comprises an integrated mirror directing an emission toward the bottom surface.
3 . The apparatus of claim 1 , wherein the laser is a horizontal cavity surface emitting laser.
4 . The apparatus of claim 1 , wherein the second plurality of pads comprises matching metal patterns on the laser such that the patterns are aligned to the output facet of the laser and the integrated mirror.
5 . The apparatus of claim 1 , wherein the first plurality of pads comprises matching metal patterns on the top surface of the slider such that the patterns are aligned to the input facet of the waveguide.
6 . The apparatus of claim 1 , further comprising fiducial marks on an edge of the slider, wherein the fiducial marks are referenced to the waveguide and align a photomask to submicron precision.
7 . The apparatus of claim 1 , further comprising fiducial marks on an edge of the laser, wherein the fiducial marks are referenced to the output facet of the laser and to the integrated mirror.
8 . The apparatus of claim 1 , wherein the laser is aligned with the waveguide using passive alignment.
9 . The apparatus of claim 1 , wherein the laser and an optical coupler of the waveguide both comprise single mode devices.
10 . The apparatus of claim 1 , wherein the bonding material comprises a solder pattern with a surface tension of liquid solder force to match the second plurality of pads on the laser and the first plurality of pads on the top surface.
11 . The apparatus of claim 1 , wherein coupling efficiency between the laser and the waveguide is insensitive to vertical spacing between the laser and the slider structure.
12 . A method comprising:
disposing a bonding material between a first plurality of pads on a top surface of a slider and a second plurality of pads of a laser, wherein the top surface is opposite a bottom surface of the slider;
positioning the laser on the top surface of the slider such that an output facet of the laser is proximate to an input facet of a waveguide of the slider at the top surface; and
reflowing the bonding material to induce relative movement between the laser and the top surface to align the input and output facets.
13 . The method of claim 12 , wherein positioning the laser on the top surface comprises:
aligning roughly the laser and the slider prior to contact between the laser and the slider; and
bringing into contact the first plurality of pads and the second plurality of pads.
14 . The method of claim 12 , wherein reflowing the bonding material comprises:
heating the bonding material above a reflow temperature; and
bringing the laser into alignment with the waveguide on the slider through surface tension.
15 . The method of claim 12 , wherein the laser comprises a surface emitting laser (SEL) and comprises an integrated mirror directing an emission out of the laser toward the input facet of the waveguide.
16 . The method of claim 12 , wherein both the first plurality of pads and the second plurality of pads comprise matching metal patterns.
17 . The method of claim 15 , further comprising:
building fiducial marks on an edge of the slider referenced to the waveguide and align an photomask to submicron precision; and
building fiducial marks on an edge of the laser referenced to the output facet of the laser and the etch mask for the integrated mirror.
18 . The method of claim 12 , wherein the laser and an optical coupler of the waveguide both comprise single mode devices.
19 . An article of manufacture prepared by a process comprising:
disposing a bonding material between a first plurality of pads on a top surface of a slider and a second plurality of pads of a laser, wherein the top surface is opposite a bottom surface of the slider;
positioning the laser on the top surface of the slider such that an output facet of the laser is proximate to an input facet of a waveguide of the slider at the top surface; and
reflowing the bonding material to induce relative movement between the laser and the top surface to align the input and output facets.
20 . The article of manufacture of claim 19 , wherein coupling efficiency between the laser and the waveguide is insensitive to vertical spacing between the laser and the slider structure.