Holy cow, what materials/manufacturing technique make them so expensive? Or is it just that companies can charge that price?
For $4000 I could (try) to build a laser at home using jade, but it would not be UV.
Thorlabs in a great place to find quality optics, but not the first place I'd go to if looking for a specific diode. These are so expensive because there is hardly any demand for them.
Nice to see you again, Alex. I hope your studies are going well.