Yea, the US even has export restriction on 3rd gen NVG optics/intensifiers (defined by FOP > 1600). BEL knows this. They were begging Photonis for 3rd gen tech 10 years ago, and still seem to be begging for it. Why would such companies hand over their prized research? Have they even hired a single PHD grad to research on this? I think this is where you can really see the difference between cheeni and us. Other than manufacturing the chinese virus, Wuhan is also known for its world class optics research/manufacturing hub. The chinese govt set up an entire sub-city called optics valley starting from the early 1990s
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There were multiple boosters for this. First was setting up universities and research labs. Look at the scale it has grown to today
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Factories slowly started springing up, mainly producing optical stuff and then spreading out to all things optics and lasers, from biosensors to intensifiers and lenses and so on. I think the industrial output here is a few lakh crores with hundreds of factories and companies concentrating in optoelectronics. This is actually the level of focus you need to cultivate a strong industrial and research sector. Sometime people including me expect too much from local companies like BEL. Not even 1% of this network exists here and govt seems disinterested.