The comment about polarity is correct.
Turns out this laser pointer is case negative; opposite of my previous DPSS laser pointers.
I incorrectly thought the pointer was DOA but it in fact works.
I should have tried reverse polarity but was afraid it would damage the pointer.
Apology to laserland.
I ordered the $19 laser from laserland. It arrived after 3 weeks and is DOA.
Using a multimeter I see it draws 1A but no light comes out. When I contacted laserland, they told me to put the batteries in the opposite direction. I did, but of course that didn't work either. I already have three...
For yesterday and today when I tried to check out at o-like and it sends me to secure.credit-pay.com, and the connection timed out.
I sent them an email but received no response.
It almost seems they don't want to do business. Any idea what's going on?
I'm looking to buy a 520nm laser diode pen style pointer powered by common batteries like AAA or AA. Do they exist?
The reason is I plan to use this once in a while at star parties and I only turn them on very briefly to avoid too much disruptions. So there is no need for long duration lithium...
I read that cheap green laser pointer may emit high levels of IR that can damage eyes. I happen to have a cheap green laser pointer and have some questions:
- if I point the laser into the sky, can the high levels of IR still injure my eyes or cause other danger?
- do red or violet laser...
Are all the green lasers made with DPSS (red laser plus a color changer), or are there green laser based on green laser diode? If so, where can I buy them?
I'm under the impression it would be more efficient.