Old 10-18-2007, 04:57 AM #1
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Default 150MW laser tech questions

Hey all,
i just found this forum.,. i got a 150 mW laser a couple of months ago and it is still going strong.,. i got it off ebay .. very nice black hard shell case it came with. but i got a couple of questions.. first how do i know it is 150 mW? and i am able to adjust the lens at the tip[.. what is the best position to have it in?? ( that is by screwing it in or out)? as well when my batteries are in need of recharge i can see the green light fade then all i see is a little bit of red reflecting inside.. what is that??
thanks if anyone can answer my questions


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Old 10-18-2007, 05:25 AM #2
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Default Re: 150MW laser tech questions

Well, I'm sorry for the bad news, but I gotta put it bluntly - its 95% you have naught more than a piece of junk. The average eBay "150mW" is more like 10-50mW of green.

Now, if you're still wondering, you need to get it tested somewhere. If you're willing to part with your laser for a few days and cover two way shipping, I can test it out for you, and there are a few other people on teh forum who will make you the same offer.

The lens in the tip should be where it is. No reason to play with it unless there's a problem. Otherwise, you're creating a problem.

The red inside is something you don't want to see. Its the loose IR laser light coming out. When there's not enough, the crystals in there can't make green. Then you're just getting a load of IR laser. Plenty dangerous, but its appears weak enough that you can't tell.

Sorry :-/
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Old 10-18-2007, 06:33 AM #3
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Default Re: 150MW laser tech questions

umm yeah you just stared into ALOT of IR! do not do that again!
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Old 10-18-2007, 01:28 PM #4
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Default Re: 150MW laser tech questions

As Pseudo said, he can test it out for you. The laser I have was tested by him and he has very nice equipment for it. And you will soon learn that you should almost NEVER get a laser from eBay without consulting other sources first! Also, for green lasers adjusting the lens will not really improve anything and you could probably ruin the laser so better safe then sorry.
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Old 10-18-2007, 05:32 PM #5
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Default Re: 150MW laser tech questions

slicker, how does your ebay laser perform at burning things? especially at a distance? and what did you pay for it? if you want to get a new one, your best bet for a high power green laser is to use one of the reputable companies that sell them. for a pen size, noone really goes above 125mW, unless they're exaggerating their ratings. it just isn't feasible to get more out of a pen size, except for the really rare freak ones (i believe someone said pseudo has a 170mW CNI?), even the quite rare 125-130mW ones are expensive. however, ones just below 125mW from good companies (such as the nova X-105, which is usually about 110-120mW) are usually a really great deal, and great at burning. also, LPF users get a 5% discount from nova by using the code "warp5" at the checkout! if you want higher power than that, you'll need a slightly bigger laser - more a sort of torch/flashlight size. nova do a few of those too, as do optotronics (who give LPF users a 7.5% discount on RPLs) and laserglow. these three companies have a great reputation here, for quality products (which are all IR filtered...except, obviously, for their actual IR lasers) and good customer service. as for the ebay one, you could buy a $10 IR filter from nova and make the ebay laser a lot safer to use. IR can be very dangerous! however, if it's been relying on the IR light (and not the green light) to burn stuff, it's burning capabilities are going to be reduced, or even entirely gone. it should still be as bright, though.
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Old 10-18-2007, 09:37 PM #6
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Default Re: 150MW laser tech questions

Hey thanks fpor the replies . now i bought it from a Canadian guy in BC and he had 50mW 100, 150. i paid $350 for it maybe about a year ago now.
It is really bright especially with the lithiums. i can see the LINE of LIGHT even during the day. it burns stuff within a matter of a second when i shine it at close range and of course from more than 5 feet away it takes a bit longer to see the burn.
750 mah niMh batteries last about 45 minutes ( that is combined use!) soo i am sure you can do the math and figure the wattage the laser is using . that is an approximate.

As for the lens at the end of it , i notice that it is coated like a pink/purple tint to it . and I want to know if it is out further does that make the beam diverge etc and the inverse for the other way around? it is quite free moving so it is not like i am "ruining" it lol.

how do i tell if it is continuous wave or pulsed wave?

also if some one wouldn't mind tellin me how it works in side? like is it an IR diode that excites a green crystal??

AND lol how could i make the beam more intense? not more power, just, more concentrated? i.e a magnifiying glass with the sun.
thanks agian you guys are very helpful


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Old 10-18-2007, 09:57 PM #7
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Default Re: 150MW laser tech questions

from my understanding, it's basically an IR diode that goes through a complex arrangement of crystals and mirrors, which cause the laser frequency to change a couple of times, ending up with 532nm light and some excess, leftover (usually filtered) IR light.
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Old 10-18-2007, 10:19 PM #8
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Default Re: 150MW laser tech questions

The common way the DPSS greens work:

The pump diode puts out a large amount of 808nm (near IR) radiation. This causes the Nd:YVO rod to pump out 1064nm (infrared) light. This rod is back to back with a KTP crystal that takes the 1064nm infrared and doubles its frequency to 532nm green. From there, it (normally) passes through an IR filter. Cheap lasers may not have this filter.
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Old 10-19-2007, 12:38 AM #9
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Default Re: 150MW laser tech questions

okay thanks for answering that question. cananyone else answer the rest?
thanks?

"Hey thanks fpor the replies . now i bought it from a Canadian guy in BC and he had 50mW 100, 150. i paid $350 for it maybe about a year ago now.
It is really bright especially with the lithiums. i can see the LINE of LIGHT even during the day. it burns stuff within a matter of a second when i shine it at close range and of course from more than 5 feet away it takes a bit longer to see the burn.
750 mah niMh batteries last about 45 minutes ( that is combined use!) soo i am sure you can do the math and figure the wattage the laser is using . that is an approximate.

As for the lens at the end of it , i notice that it is coated like a pink/purple tint to it . and I want to know if it is out further does that make the beam diverge etc and the inverse for the other way around? it is quite free moving so it is not like i am "ruining" it lol.

how do i tell if it is continuous wave or pulsed wave?

AND lol how could i make the beam more intense? not more power, just, more concentrated? i.e a magnifiying glass with the sun.
thanks agian you guys are very helpful "
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Old 10-19-2007, 02:13 AM #10
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Default Re: 150MW laser tech questions

most green DPSS lasers are CW - if it was pulsed and you moved the laser very fast you would see a trail of dots instead of a solid line

the IR filter on my laser is a blue/green color so the lens you are describing is probably not the IR filter (if it even has one)
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Old 10-19-2007, 05:00 AM #11
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Default Re: 150MW laser tech questions

Quote:
Originally Posted by sliccker
how could i make the beam more intense? not more power, just, more concentrated? i.e a magnifiying glass with the sun.
You just answered your own question there.
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Old 10-19-2007, 05:23 AM #12
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Default Re: 150MW laser tech questions

Quote:
Originally Posted by Cyparagon
[quote author=sliccker link=1192679832/0#5 date=1192739839]how could i make the beam more intense? not more power, just, more concentrated? i.e a magnifiying glass with the sun.
You just answered your own question there. [/quote]

lol okay but any kinda lens in particular???
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Old 10-19-2007, 07:24 AM #13
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Default Re: 150MW laser tech questions

From what you've said it sounds like you have a Spymode crap laser. The scam has been pretty common on eBay and still manifests itself all over the web today. I'm sorry for the bad news, but your unit is probably <40mW or true green. I have 2 vids testing this laser somewhere, but I'm too lazy to go find them right now (anyone else up to the task? ).

As said above, to focus it you jsut use a magnifying glass. Like the sun, it'll only get focused at a certain distance away. If you're looking to make the beam more focused in general, you'll unfortunately need a magician - a very good magician at that.
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Old 10-19-2007, 03:48 PM #14
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Default Re: 150MW laser tech questions

here is a pic of it . maybe you can tell me if it looks like a rip off one.. lol ( i know it is not spymode)
And to be quite honest it isnt from the UK i bought it in CANADA and the case is used by many other companies i see on the net.
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