Laser Diode Bar Soldering

My guide on how to solder to all of the laser diodes you remove from dvd burners.

Laser diode bar soldering.

This video shows typical pcb soldering with 20 30w fiber coupled diode laser. Four gold plated brass connector pins molded in plastic. 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 soldering quality needs a laser spot with a precise round shape and constant intensity.

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. The beam is delivered via an optical fiber. 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. Soldering iron hot bar thermode and diode laser best fit choice.

The wavelength of these lasers are typically in the near ir and are suitable for laser soldering and plastic welding. Suzanne jenniches patented laser soldering in 1980. Diode laser systems based on semiconductor junctions are used for this purpose. 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.

For further details please contact email. Recent innovations to increase the power and beam quality has opened new opportunities in micro joining processes. Direct diode lasers ddls use the light from diodes without further amplification in fibers or crystals. Laser soldering is a technique where a 30 50 w laser is used to melt and solder an electrical connection joint.

Wavelengths are typically 808 nm through 980 nm. 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. 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.

In a second step the beam is coupled into the fiber by special optics.