Laser package with reversed laser diode

• US 5,550,852 A
• Filed: 02/10/1995
• Issued: 08/27/1996
• Est. Priority Date: 02/10/1995
• Status: Expired due to Term

• Current Assignee: II-VI Laser Enterprise GmbH (Coherent Corp.)
• Original Assignee: Opto Power Corporation (MKS Instruments Incorporated)
• Inventors: Agarwal, Rajiv, Nahapetiance, Henri, Patel, Rushikesh M.
• Primary Examiner(s): Scott, Jr., Leon
• Application Number:
  US08/386,413
• Time in Patent Office: 564 Days
• Field of Search: 372/34, 372/36, 372/33, 372/107, 372/92, 372/38, 372/29
• US Class Current: 372/33
• CPC Class Codes: H01S 5/0239 Combinations of electrical or optical elements
• CPC Class Codes: H01S 5/042 Electrical excitation ; Circuits therefor monolithically integrated laser drive components H01S5/0261
• CPC Class Codes: H01S 5/06825 Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
• CPC Class Codes: H01S 5/40 Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30 H01S5/50 takes precedence

Abstract

A laser package includes a housing and a subassembly to which the critical components of the laser package are mounted. The subassembly is structured to preserve component alignment even in the presence of thermal excursions by ensuring that any movement which might occur effects all the components in a way to preserve alignment. The subassembly is easily removable from the housing and thus permits replacement if a failure should occur. A reverse diode is included to provide a path for reverse currents which otherwise would be damaging to the active laser diode.

Claims

1. A laser diode package including a first laser diode having an emitting surface and a power source for applying a voltage to said diode for generating light from said emitting surface, said package also including a second diode connected electrically to said power source in parallel with said first laser diode and in a direction reversed from that of said first laser diode for providing a path for currents in said reversed direction which would otherwise damage said first laser diode.

2. A package as in claim 1 wherein said second diode is a laser diode which is not operative optically but is an electrically operative diode fabricated at the same time as said first laser diode so as to have electrical properties like those of said first laser diode.

3. A package as in claim 1 also including an optical fiber having an end aligned with said emitting surface of said first laser diode.

4. A package as in claim 3 also including a cylindrical lens mounted between said emitting surface and said optical fiber.