Laser Diode Bar Soldering

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Laser diode bar soldering.

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. Diode laser systems based on semiconductor junctions are used for this purpose. Wavelengths are typically 808 nm through 980 nm. For fiber coupled diode lasers see figure this is perfectly the case.

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. The wavelength of these lasers are typically in the near ir and are suitable for laser soldering and plastic welding. Diode laser the beam of the laser diodes is at first collimated in one axis by a cylinder lense. 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.

Soldering iron hot bar thermode and diode laser best fit choice. 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. 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. High soldering quality needs a laser spot with a precise round shape and constant intensity.

Laser soldering is a technique where a 30 50 w laser is used to melt and solder an electrical connection joint. In a second step the beam is coupled into the fiber by special optics. To build an external resonator using a laser bar is an appealing strategy used mainly to increase power brightness or spectral brightness of the laser bar itself. This video shows typical pcb soldering with 20 30w fiber coupled diode laser.

Recent innovations to increase the power and beam quality has opened new opportunities in micro joining processes. My guide on how to solder to all of the laser diodes you remove from dvd burners. 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. Diode laser example 2.

Suzanne jenniches patented laser soldering in 1980.