Here's what drlave said about it in another thread:I think the detail missing is that "multimode" is a completely relative term. If it's not one, it's multi, and therein lies the possible confusion. It could be gain-guided with some massive width, or it would be what that one guy said on PL and be index-guided and only 7um wide. A 7um ridge laser would likely be multimode, but not nearly as bad as wider ridges, and not nearly as bad as a gain-guided diode.
Then, even beyond the diode, you get into "multimode" bars which are actually multiple emitters, which makes it even worse.
But just someone saying "multimode" could mean any of these things, especially if you get people who just hear "multimode" and really don't know the difference. It's a phrase that gets repeated a lot with relative certainty, even though it is a completely relative term.
If the guy on PL is right and it's an index-guided 7um wide laser, then it's likely not going to be too bad. A single mode laser may be 2 or 3 um wide, just for reference, so 7um isn't that much wider, relatively speaking. ETA: Also for reference, a PHR has a ~1.5um ridge width.
the beam, as it comes out of a basic aspheric collimator, is about 4.5mm tall and 0.2mm wide. over a distance it turns square, then rectangular reminiscent of a c-mount 808 collimated with the same method. I do know of a few ways to collimate the beam into an even 'dot' namely using cylindrical lenses but have not acquired the proper lenses yet. If I do, there may be a group buy or something so if you buy one of these diodes keep in touch.
The lenses being used and discussed are aspheric, not "asymmetric". Asphereic lenses are what we are mostly already using.Well if the lens is asymmetric than the typical screw in method wont work will it? The lens or lenses will have to be aligned with the asymmetrical output of the diode.
Not in TVs, but in micro-projectors. SAMSUNG has a prototype that I saw at COEX technology show last year. It uses 1 red, 1green DPSS? Not sure.... and a true blue diode. The total size is a little larger than a deck of cards.Why do you think this? Laser TV's already exists, but it seems that manufacturers largely goes for OLED's instead.