What They Say
A company called Ganvix is working with an equipment maker from Australia called BluGlass to try to develop a new way of making vertical cavity surface-emitting lasers (VCSELs) that emit in the green spectrum. The firms are collaborating with ITRI in Taiwan.
According to Ganvix, its approach enables fabrication of VCSELs entirely from epitaxially-grown GaN without introducing any crystalline defects or lattice mismatch. The sub-wavelength nanopores result in a GaN/air nanocomposite, which has a tunable refractive index facilitating formation of high reflectivity (>99.9%) distributed Bragg reflectors (DBR) critical for VCSEL devices.
Meanwhile Australia-based BluGlass has been developing a novel deposition technique called remote plasma chemical vapor deposition (RPCVD), which differs from metal-organic chemical vapor deposition (MOCVD) and molecular beam epitaxy (MBE), the two methods more typically used to produce laser diodes.
The lasers are expected to find applications in headsets using laser-scanning display technologies.
What We Think
Digging around on this topic, I found a backgrounder by sometime contributor Karl Guttag on some of the challenges of green lasers. It’s more than a decade old, but has some interesting comments (BR)
RPCVD epitaxy equipment
