Laser Diode Bar Soldering

High soldering quality needs a laser spot with a precise round shape and constant intensity.

Laser diode bar soldering.

Diode laser yes energy transmitted directly to solder paste which conducts heat to wire and silver thick film protecting glass from overheating and excessively long reflow cycle time. Suzanne jenniches patented laser soldering in 1980. The wavelength of these lasers are typically in the near ir and are suitable for laser soldering and plastic welding. The beam is delivered via an optical fiber.

Cycled life test data for a jds uniphase industrial diode laser idl system shows that power decreases only one to three percent after 5300 hours of operation. This method has appeared in a couple of my videos but i d like to give it it s own video as its by far the best. These single emitter diodes do not exhibit the fatigue issues associated with bar diodes and as a result have much longer expected lifetimes in soldering systems than bar based systems. Four gold plated brass connector pins molded in plastic.

For fiber coupled diode lasers see figure this is perfectly the case. Diode laser example 2. My guide on how to solder to all of the laser diodes you remove from dvd burners. This video shows typical pcb soldering with 20 30w fiber coupled diode laser.

Solder free laser bar mounting while soldered bars present a serie of problems as thermal expansion mismatch high temperature process fatigue effect with consequient lifetime reduction our clamping technology overcomes all of these troubles thanks to the total elimination of the soldering process. Wavelengths are typically 808 nm through 980 nm. Soldering iron hot bar thermode and diode laser best fit choice. Recent innovations to increase the power and beam quality has opened new opportunities in micro joining processes.

High spatial brightness w cm 2 sr is pursued in high power diode lasers when industrial applications like metal cutting drilling or soldering come into play. In a second step the beam is coupled into the fiber by special optics. Diode laser systems based on semiconductor junctions are used for this purpose. Laser soldering is a technique where a 30 50 w laser is used to melt and solder an electrical connection joint.

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