"NSM" writes:

"Sam Goldwasser" wrote in message
...

Not really true, see my other posting on this topic.

I've been told that these are the lasers used in grocery scanners, or
rejects from them. In that case I suspect they want to minimise eye damage
AND get reliable scans. The geometry may be designed for that.

To the best of my knowledge, that's not true. They are the same type of
laser diodes as used in barcode scanners and those are single transverse
mode diode.

Laser diodes are difficult to collimate and focus, but that's the nature of
the beast. It is possible though.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.