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Apparatus for enhancing collimation and improving collection efficiency from high aspect ratio linear energy sources
| Details |
Inventors: Wallace, Robert E.;
Assignee: Varo Inc. (Garland, TX)
Primary Examiner: Ben; Loha
Assistant Examiner: Collins; Darryl J.
Attorney, Agent or Firm: Baker & Botts
There is provided an apparatus for improving power transfer or collection efficiency from a high aspect ratio linear junction laser diode to associated collimation optics in a weapon rangefinder, illuminator, laser spot projector, optical security system, or other optical device. A cylindrical or rod lens (16) is positioned adjacent to the emitting region (14) of the laser diode (10), the longitudinal axis of the rod lens (16) being parallel to the emitting region (14). Preferably, the emitting region (14) of the laser diode (10) is located at the bottom of a V-shaped surface (20) of the laser diode (10), for facilitating alignment of the rod lens (16) with the emitting region (14). The rod lens (16) may comprise a fiber optic strand of either glass or plastic material, and is small enough to be totally encapsulated within the window capped case (26) of the laser diode (10) o The cylindrical lens can be a gradient index type, holographic optical element, aspheric, or a combination of the aforementioned as well as circular cross-section rod lens. In an alternative embodiment, a rod lens (16) may be used to collect and collimate light emitted from a wire filament in a copier or page scanner, for example. |
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DETAILED DESCRIPTION The present invention provides a coupling means for a high aspect ratio linear junction laser diode or other linear energy source which satisfies the aforementioned needs.
A very small cylindrical or rod lens (diameter on the order of the junction length) is positioned in close proximity to the linear energy source, the longitudinal axis of the rod lens being parallel to the source.
In the case of a high aspect ratio linear junction laser diode, the diode emitting region is preferably located at the bottom of a V-shaped surface in the laser diode chip.
The rod lens is disposed against the V-shaped surface for facilitating alignment of the rod lens with the emitting region.
The rod lens preferably comprises a circular cross-section strand of either glass or plastic material, and is small enough to be totally encapsulated within the window capped case of the laser diode.
Its function is essentially that of a micro-field lens which couples power from the diode emitted in a plane perpendicular to the junction to the collimating lens while broadening the apparent width of the junction at the same time.
In another aspect of the invention, a method for improving the degree of collimation of light emitted from a linear junction laser diode having an elongated emitting region and a window capped case is provided.
A cylindrical lens is positioned in a spaced relationship with the emitting region of the laser diode such that the longitudinal axis of the cylindrical lens is parallel to the emitting region.
In this manner, the angle of light emitted from the emitting region is substantially reduced by the cylindrical lens.
In yet another aspect of the invention, an improved laser diode which emits light having enhanced collimation is constructed by manufacturing a linear junction laser diode having a semiconductor chip with a V-shaped surface formed therein and an emitting region disposed at the bottom of the V-shaped surface, and then positioning a cylindrical lens spaced a fraction of the cylindrical lens diameter from the emitting region
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