Abstract
Fiber laser sources near 2um wavelength have attracted intense interest in recent years because of the combination of high laser efficiency, strong absorption of many visible transparent materials, outstanding reliability, as well as retina safety. In this presentation, we report our latest developments of various 2um fiber lasers at AdValue Photonics for packaging applications, especially Q-switched and mode-locked 2um fiber lasers using our proprietary infrared glass fiber technology. We demonstrated and commercialized the first all-fiber Q-switched single-frequency laser at a wavelength near 2um using our proprietary rare-earth doped gain fibers. The laser pulsewidth can be 20ns and 180ns, and the peak power can be more than 10kW. Most transparent plastic materials have a relatively strong absorption near 2 micron wavelength, so 2 micron Q-switched fiber laser is one of the ideal laser for transparent plastic welding, marking, cutting, and drilling. Silicon has a good optical transmission near 2 micron wavelength, which allows 2 micron Q-switched to process the material after pass through the silicon wafer as well as remove residual materials containing any organic components. In this presentation we will describe detailed experimental results and present material processing samples for packaging applications.
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