Come on, guys. We ORDERED a lab laser (671nm Red DPSS Laser System | BigLasers.com), and asked Colin for their spec on coherence lenght. He replied it was 50cm, which is not unreasonable for this class of lasers and the price. What we got was a laser with <1mm coherence length, which in this spec is no better than a laser pointer. That's what I meant when I wrote "$5K laser pointer". When we presented the vendor with evidence of this short coherence length, he first claimed ignorance and lack of technical savvy, then just went silent.
I'm posting this to warn people about this vendor, not to draw your judgement on our level of common sense. Buying from China is very common and ordinary these days, we do it all the time, and it does not mean every vendor is a scam artist. But this one evidently is.
I'm posting this to warn people about this vendor, not to draw your judgement on our level of common sense. Buying from China is very common and ordinary these days, we do it all the time, and it does not mean every vendor is a scam artist. But this one evidently is.