> > My 1W blue works nicely on wood
>
> Dave, how are you defining "1W" ? I've seen several advertised
> as 1000mW or better, like these
> http://nz.ioffer.com/i/waterproof-3000mw-green-laser-pointer-burn-match-5=
02182962
> Small print for some of them states the output power at only a
> few hundred mW
>
> (1) would you expect something around 20% efficiency, i/p v o/p ?

I'd expect that 10%+ would be good.
While direct injection green LASERS are starting to become available
in eg projector system the vast majority to date are  DPSS (Diode
Pumped Solid State) with a red laser at around 880 nm pumping a
Nd:YVO4 crystal to produce 1064 nm IR output which is frequency
doubled to green at 532 nm. This multistage process is (not
surprisingly) somewhat lossy  - so anyting over 10% end to end is
probably acceptable.

> (4) can you *really* make a dot on a star ? ;-)))
> http://nz.ioffer.com/i/power-green-laser-pointer-5000mw-532nm-burn-match-=
502179752

Only in Hollywood.

I like his comment:
/Clueless mode aside:
    How long is he going to last with PP?
    This is the sort of seller that results in  Paypal behaving badly
in other less severe cases:-(.
/deaside

    "if you want pay by PAYPAL, after you buy, please tell me what is
you paypal account.
    i will send you a paypal invoice,then you pay me by paypal.
    Please don't write any information in PAYPAL message.
    if you don't write any information in PAYPAL, i will send you a gift."

 ________________


Nice green DPSS  pumped LASER cross section diagram here
http://www.repairfaq.org/sam/l54-101.gif


Almost useful NdYVO4 search results but only access if your security
systems are up to date.
http://zomobo.net/Nd:YVO4

Sam's LASER FAQ (yet again for those who haven't met it).
Superb. Deepest black of black holes. Marvellous. Dangerous.
http://www.repairfaq.org/sam/laserssl.htm

Dismantled DPSS green LASER pointer
http://www.repairfaq.org/sam/grnorg1.jpg

DPSS testing adjustment repair dismantlement destruction
http://www.repairfaq.org/sam/laserstr.htm#strdgp1

404 (strangely)
http://www.edsci.com/

Red LASER pointer. No pump. Nice and simple
http://www.repairfaq.org/sam/lsrptr1.gif

Green pointer  less dismantled
http://www.repairfaq.org/sam/grnptr1.jpg

LASER equipment gallery
Danger will Robinson
Black Hole with bar
1200+ photos ............
http://www.repairfaq.org/sam/laserpic/

Hmm DIY Copper Vapor LASER, DIY Nitrogen, DIY Ruby ...

Run.
--=20
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