Green laser lost focus

wucheeyiun · Post by **wucheeyiun** » Fri May 25, 2007 9:47 am

I have a typical green laser which had lost focus after using for 6 months...
anyone knows how to adjust it back to pinpoint.... :oops:

yanyewkay · Post by **yanyewkay** » Fri May 25, 2007 10:35 am

most laser led that are sold in the market come in a sealed modules. looks similar to common red/green LED where it is manufactured and cast in 1 piece

There's basically nothing you can do about it, i suspect that the led module had cracked.

Canopus Lim · Post by **Canopus Lim** » Fri May 25, 2007 3:43 pm

The green laser is actually a complicated laser pointer as there is no laser diode that produces green colour. It has a diode laser which is used to pump the crystal inside (if I am not wrong Nd:YAG) and from this crystal and cavity it generates 1064nm laser before frequency doubling to green colour. It loses focus probably because something was misaligned (lens or components inside) or the laser diode pump may have burned out.

I don't think there is anyway to align back the lenses as it is sealed and there are no screws to align the lens. It is essential that the lens used to collimate the laser beam is good and well aligned else the laser cannot 'go far'. Did you drop it?

aquillae · Post by **aquillae** » Sat May 26, 2007 9:54 am

it happened to mine too, and i never dropped it.

yanyewkay · Post by **yanyewkay** » Sat May 26, 2007 10:52 am

mm.. you guys used long period of time at a go?
where did you buy it?

aquillae · Post by **aquillae** » Sat May 26, 2007 2:50 pm

not really, but maybe pressed it too long by accident (when it was inside my pocket)

i got it from another fellow singastro-ian.

neoterryjoe · Post by **neoterryjoe** » Sat May 26, 2007 3:13 pm

apparently, my green laser just lost focus too..was not used frequently and didnt drop it, yet.... *sob*. its not cheap(bought from a singastroian new, its the black one..). hmmm. its seems that quite a few singastroians have problems with green laser pointers...

wucheeyiun · Post by **wucheeyiun** » Sat May 26, 2007 5:34 pm

neoterryjoe wrote:apparently, my green laser just lost focus too..was not used frequently and didnt drop it, yet.... *sob*. its not cheap(bought from a singastroian new, its the black one..). hmmm. its seems that quite a few singastroians have problems with green laser pointers...

i di not drop it, it just became like that too, i bought the black one from singastroian for $90...

Clifford60 · Post by **Clifford60** » Sat May 26, 2007 5:57 pm

All laser LED has a life span, so yours likely has come to the end of life or may be the laser LED is of a lower grade or so called quality reject.

Canopus Lim · Post by **Canopus Lim** » Sat May 26, 2007 10:14 pm

My green laser pointer so far is still working fine and gives a well aligned and powerful laser spot.

But it cost much and I bought it from a reliable source.