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FUSING OF DIODE LASERS

IP.com Disclosure Number: IPCOM000025479D
Original Publication Date: 1985-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 51K

Publishing Venue

Xerox Disclosure Journal

Abstract

Diode lasers are quite susceptible to damage due to current surges applied to the device. For example, the application of open circuit voltage from the power supply prior to the insertion of the laser in the line circuit will cause, upon its subsequent insertion in the line circuit, a sudden current surge through the laser which will destroy i t due to the low resistance value of the laser, which is on the order of 2 ohms.

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XEROX DISCLOSURE JOURNAL

FUSING OF DIODE LASERS Donald R. Scifres
Joseph C. Tramontana

Proposed Classification
U.S. CI. 372/45 Int. CI. HOls 3/19

Diode lasers are quite susceptible to damage due to current surges applied to the device. For example, the application of open circuit voltage from the power supply prior to the insertion of the laser in the line circuit will cause, upon its subsequent insertion in the line circuit, a sudden current surge through the laser which will destroy it due to the low resistance value of the laser, which is on the order of 2 ohms.

We describe here a method for determining when undesirable current surges, greater than the maximum rated laser current, have been applied to the laser. The lead wires to the laser terminals are designed to be fusing wires which do not have the capacity to carry a DC current which exceeds the maximum rated laser current. Typically, a one mil diameter gold fusing wire will open circuit at a current exceeding one amp. If a higher maximum fusing current is desired, more fusing wires in parallel may be added between the power supply and the laser terminals. If a lower maximum fusing current is desired, smaller diameter wires or wires of less current carrying capacity may be used. Failed.or melted fusing wires are easily spotted for replacement.

Volume 10 Number 4 July/August 1985 239

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