And, once lost, the BPP can’t be recovered. The BPP is then dominated by the angular spread. When collimated and combined with a single lens, the angular divergence gets very large. Even if circularized, the beams are spread out. That preserves the BPP while creating a high-power beam.Īs an alternative, consider diodes in a linear array - a bar. The individual beamlets are then spatially brought together. NUBURU does this with individual actively aligned micro-optics for each diode. To optimize beam quality, the output of each of the many diodes needs to be circularized and collimated. That’s important, because once the BPP gets larger, it can’t be made smaller. It takes some clever engineering to do this without making the BPP larger. High power blue lasers combine outputs of many individual diodes. The trick, then, is to design a system that has both high power and a small BPP. Brightness is a measurement of light power “concentration.” Beam parameter product (BPP) is a laser specification indicating the beam “spread.” For a given output power, the brightness is maximum when the BPP is smallest.
