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Laser output drop immediately upon turn on

nobeltnium

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I bought a green laser module from this site
aliexpress.com/item/4000983430911.html?spm=a2g0o.productlist.0.0.d48a7d61EWSES6&algo_pvid=5466a630-252b-4159-90cf-d4350df92a60&algo_expid=5466a630-252b-4159-90cf-d4350df92a60-26&btsid=0be3769015977396861066047ed32c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
i removed www. since the forum doesn't allow me to post links

it look exactly like in the picture shown there. The retailer claim it give an output of 50 miliwatts. But to me it's kinda dim, more like a 10mw.
Upon closer inspect i realise when first turn on the beam is very bright, however the power drop almost instantly after less than 1 second. So i decide to put it in the fridge for a few minutes, take it out and this time, while chill it give a very bright, true 50mw light beam to me. But then of course, come mode hopping

96f43128f69d0ac3538c.jpg
I have tried 2 other module in the past also dpss green laser and this also occured. I know that these cheap modules behave like this are expected but i can't just throw money and buy dozen of them. Are there something can be done? I only need the module give me full output for 20 seconds or so, not terribly long so i'm thinking of changing to another heatsink that is more tight fit, or apply some thermal paste. If all fail i might just switch to blue/violet laser since with green i don't have much luck at all :(:(
 



hakzaw1

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Actually luck has very little to do w/ your problem.
IF the module is bad send it back--the seller may send a second one w/o you needing to ship
it back to china...ask and offer to take pics.. Shipping back to China will cost many times more than what you paid.-- A long time ago China and the USA agreed to practically free shipping TO THE USA.. not stuff going there. SO it is not going to paid back to you by China.

Try a better and fully charged batt. Blue lasers are fairly bright--405 is oftem mistaken as a bad module--it is just VERY hard to 'see' so you may not be happy with that choice.

Most agree that 555nm (not made afaik) is the perceived most brightest.. so 532 nm is as close as you can get..they are DPSS and all (afaik) are case positive.

IF you tried the wrong way--THAT prolly caused your problem and you will have to eat that one.

NEVER use the trail and error method of finding the correct polarity--NOT a smart move.
Even 'some' that have reverse polarity protection only protect the diode --but NOT the cheaper driver. (afaik)

There are dozens of causes for a fail-- we don't think (at first) about touching the diode with your finger (static) or running it too long non-stop (known as failure to use the proper duty/rest cycle)... my 1st 532 pen pointer failed the first day when I did not give ANY rest cycle & back then they cost $40usd-- lasted one night..OUCH!
if you did that--sorry . The chances that you got a bad one are very slim--man up and please give your seller a break-- as I doubt that the laser was bad before you got it.
But--I could be wrong.
best

hak

Way too many blame the laser or seller.. and THAT makes us pay more- nothing is really free

ask the seller--
 

Encap

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I bought a green laser module from this site
aliexpress.com/item/4000983430911.html?spm=a2g0o.productlist.0.0.d48a7d61EWSES6&algo_pvid=5466a630-252b-4159-90cf-d4350df92a60&algo_expid=5466a630-252b-4159-90cf-d4350df92a60-26&btsid=0be3769015977396861066047ed32c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
i removed www. since the forum doesn't allow me to post links

it look exactly like in the picture shown there. The retailer claim it give an output of 50 miliwatts. But to me it's kinda dim, more like a 10mw.
Upon closer inspect i realise when first turn on the beam is very bright, however the power drop almost instantly after less than 1 second. So i decide to put it in the fridge for a few minutes, take it out and this time, while chill it give a very bright, true 50mw light beam to me. But then of course, come mode hopping
I have tried 2 other module in the past also dpss green laser and this also occured. I know that these cheap modules behave like this are expected but i can't just throw money and buy dozen of them. Are there something can be done? I only need the module give me full output for 20 seconds or so, not terribly long so i'm thinking of changing to another heatsink that is more tight fit, or apply some thermal paste. If all fail i might just switch to blue/violet laser since with green i don't have much luck at all :(:(
What do you expect for $3.64 less than the cost of a good cup of coffee--high quality perfection? LOL

Overheating any of them will cause problems expecially 532 DPSS modules --not as much or as easily with direct diode blue/violet.
It says specifically in the AliE offering " It working must with Cooling Heatsink/ Heat Sink together " and " Constant current output , Can be adjusted(0~580mA )"

Try using a heat sink and adjusting the output --20 seconds on should not be a problem---if just seconds/production rejects of low quality low cost modules/semi-defective garbage, that is not adjustable.
Return it if it is wotrh more than the postage to do so--ask AliE about the 90 day return money back guarantee---perhaps you can get a some sort either full or partial refund without returning it. You can always just a laser 301 532nm on Ebay for $5- to $10 depending --should run at same output for more than 20 seconds.

Sounds like you have been repeating the same thing over and over with same result---don't do it again--as Einstein said: " Insanity: doing the same thing over and over again and expecting different results. "
 

nobeltnium

New member
Joined
Aug 18, 2020
Messages
11
Points
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Actually luck has very little to do w/ your problem.
IF the module is bad send it back--the seller may send a second one w/o you needing to ship
it back to china...ask and offer to take pics.. Shipping back to China will cost many times more than what you paid.-- A long time ago China and the USA agreed to practically free shipping TO THE USA.. not stuff going there. SO it is not going to paid back to you by China.

Try a better and fully charged batt. Blue lasers are fairly bright--405 is oftem mistaken as a bad module--it is just VERY hard to 'see' so you may not be happy with that choice.

Most agree that 555nm (not made afaik) is the perceived most brightest.. so 532 nm is as close as you can get..they are DPSS and all (afaik) are case positive.

IF you tried the wrong way--THAT prolly caused your problem and you will have to eat that one.

NEVER use the trail and error method of finding the correct polarity--NOT a smart move.
Even 'some' that have reverse polarity protection only protect the diode --but NOT the cheaper driver. (afaik)

There are dozens of causes for a fail-- we don't think (at first) about touching the diode with your finger (static) or running it too long non-stop (known as failure to use the proper duty/rest cycle)... my 1st 532 pen pointer failed the first day when I did not give ANY rest cycle & back then they cost $40usd-- lasted one night..OUCH!
if you did that--sorry . The chances that you got a bad one are very slim--man up and please give your seller a break-- as I doubt that the laser was bad before you got it.
But--I could be wrong.
best

hak

Way too many blame the laser or seller.. and THAT makes us pay more- nothing is really free

ask the seller--
i don't live in the USA, and i can't contact the dealer so i don't know about returning it.
secondly i know what polarity goes where, i had schematic of the pcp so i know where to solder. I NEVER touch the diode, if i want to i couldn't since its under the crystal.And yes, i'm pretty sure LUCK have something to do with this. Like i have stated in my post, other modules act the same, which mean this is not my first time with laser anw so i'm pretty sure what i'm talking about.
I tried with 5 other batteries, fully charge and measure 4.2 Volts, partly charged 3.8 volts nothing change.

Since i don't want to send it back to the seller because i don't feel playing lottery anymore and waiting period is a pain, so worst case scenario i'm just gonna keep it as it is. What i want is a quick dirty way to work around this, tinker with it to see what can be done. If not then i'll just have to leave it be
 

nobeltnium

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Messages
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What do you expect for $3.64 less than the cost of a good cup of coffee--high quality perfection? LOL

Overheating any of them will cause problems expecially 532 DPSS modules --not as much or as easily with direct diode blue/violet.
It says specifically in the AliE offering " It working must with Cooling Heatsink/ Heat Sink together " and " Constant current output , Can be adjusted(0~580mA )"

Try using a heat sink and adjusting the output --20 seconds on should not be a problem---if just seconds/production rejects of low quality low cost modules/semi-defective garbage, that is not adjustable.
Return it if it is wotrh more than the postage to do so--ask AliE about the 90 day return money back guarantee---perhaps you can get a some sort either full or partial refund without returning it. You can always just a laser 301 532nm on Ebay for $5- to $10 depending --should run at same output for more than 20 seconds.

Sounds like you have been repeating the same thing over and over with same result---don't do it again--as Einstein said: " Insanity: doing the same thing over and over again and expecting different results. "
this thing already come with a copper housing with decent heat capability, i can feel it warm up when use, idk about add another heat sink on top of it will help but i'll try. And this thing is non adjustable, there are nothing to be adjusted. No screw on the pcp to twist at all. Talk about the 301 laser mehh, that's what i got last time, same thing happened i'm not impressed. 10$ product at exactly the same as with 3$ module. So i guess i didn't doing the same thing over and over again am i right :)
 

Encap

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You said" I have tried 2 other module in the past also dpss green laser and this also occured. -- that's 3 times-" power drop almost instantly after less than 1 second "
After doing same thing with 3 different modules and same result is probably is not luck good or bad .
Nobdy has ever reported same on experience on LPF--extreme power drop in 1sec or less. Most of similar modules are good for at least 30 to 60 seconds with or without an additional heat sink
Maybe they gave you a lower output module like with no adjustable driver--who knows.

You say you can't contact the dealer--the "dealer" was the entity who took your money, AliExpress.
How were you able to buy it then---makes no sense.

Try a better quality module from a better more relaible vendor----the one you received is probaly a production reject/second quality garbage. if it truly is supposed to be 50mW

PS you show a photo of a dot--the link you gave for is a line output module not a dot output in every picture about the product so...
 
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nobeltnium

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You said" I have tried 2 other module in the past also dpss green laser and this also occured. -- that's 3 times-" power drop almost instantly after less than 1 second "
After doing same thing with 3 different modules and same result is probably is not luck good or bad .
Nobdy has ever reported same on experience on LPF--extreme power drop in 1sec or less.

You say you can't contact the dealer--the "dealer" was the entity who took your money, AliExpress.
How were you able to buy it then---makes no sense.

Try a better quality module from a better vendor----the one you received is probaly a production reject/second quality garbage.

PS you show a photo of a dot--the link you gave for is a line output module not a dot output in every picture about the product so...
the 1st time is the 303 laser pointer that you suggested. 2nd time was a module like this, different vendor. But without the line spliter. Although it can withstand a little longer (4 seconds) still not enough for my use.
This spliter can be removed from the module. When i got this i just tiwst the beam splitter out and use it as a normal pointer.
I tried to PM the seller, but since this module is not that expensive i lost the lust to go through all the hassel of having to go to the post in middle of corona, wait another 2 weeks. So like i told hakzaw1, not interest in returning anymore. Just want to find ideas to mess with it that's all.
And for the nobody have ever report about power drop in 1 sec or less. Now you have 1 :D
 
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Encap

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Try buying better quality DPSS 532nm lasers that most everyone has a good experience with not cheapest lowest quality, least desiable possible if you need particuarly good results. That is a real world answer.

Excellent high quality proffesional grade 532nm laser pointers can be bought here: https://www.jetlasers.org/index.php?id_category=17&controller=category or you can get a better quality metered reliable 532nm 80mW laser 304 from Sanwu for $25: https://www.sanwulasers.com/product/304

Wishing you good luck whatever the case is or becomes
 
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hakzaw1

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sorry you did not like my help==no offence was meant.

good luck

hak......in Texas

added
;
Not many at LPF buy anything from Ali--some of the listng are pure Bull5hit.

Like a laser making 10,000 mW and its a portable laser.

BUT there are a few there not trying to trick anyone.

good luck--Is it OKay to ask where you are??
hak
 
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nobeltnium

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sorry you did not like my help==no offence was meant.

good luck

hak......in Texas

added
;
Not many at LPF buy anything from Ali--some of the listng are pure Bull5hit.

Like a laser making 10,000 mW and its a portable laser.

BUT there are a few there not trying to trick anyone.

good luck--Is it OKay to ask where you are??
hak
I know the reality of these cheap module so i'm not expecting any 10W super power or anything, i just need to have them work for a short time even though that will destroy them i'm ok with that. That's why i need the cheap one. I appreciate your help, just want to clear some thing up so that everyone can have a better understanding of the situation.
I move around,but only around Asia region like china, cambodia, thailand etc... :D As for nationality i'll keep it for myself. Cheers
 

hakzaw1

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Sounds like you have an interesting life. good luck finding the lasers you need. I have several 'trios' that are what I call 'pen pointers' (aaa) and the RGV '300s' or '500s'the kind- take a single 18650-@3.7 vdc-These are great to use in place of more expensive--I got lucky at Ebay auctions=best 'win' was RGV (aaa) about $3 usd (for all-& free$hip) and ~$9usd for the larger.
Many places make these- some are much better than others-BUT none are 5mW or even 20mW.
they must 'list' them that way so shippers and ebay & PPal can deal in them .

Stay safe--stay well
my best--Len
 

Gabrielgflower

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I have a 303 that behaves like that but only sometimes! I have a feeling that it depends on the batteries that I'm using, since it doesn't happens always. Otherwise it can hold up pretty well for much longer then 20s. I'll try to do some measurements.
 

Encap

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I know the reality of these cheap module so i'm not expecting any 10W super power or anything, i just need to have them work for a short time even though that will destroy them i'm ok with that. That's why i need the cheap one. I appreciate your help, just want to clear some thing up so that everyone can have a better understanding of the situation.
I move around,but only around Asia region like china, cambodia, thailand etc... :D As for nationality i'll keep it for myself. Cheers
Simply buy a Laser Power Meter metered and more reliable than most low cost alternatives Sanwu 304 80mW 532nm for $25 see: https://www.sanwulasers.com/product/304 and a good quality 18650 battery, not from Sanwu, for it and be done with any issues. If you can't manage to do that, there is little if any hope of a practical low cost answer to resolve, in the real world, your 532nm requirements and problem.
 
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gazer101

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If it doesn't need to be exactly 532nm, you can get a cheap 525nm laser module from amazon
 

nobeltnium

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Simply buy a Laser Power Meter metered and more reliable than most low cost alternatives Sanwu 304 80mW 532nm for $25 see: and a good quality 18650 battery, not from Sanwu, for it and be done with any issues. If you can't manage to do that, there is little if any hope of a practical low cost answer to resolve, in the real world, your 532nm requirements and problem.
At 25$ range i think i'm gonna go with a violet diode. There is some seller put up on the shelf a 500mw emmiter for 30$ or something like that. One of the client commented that he measured true output was 300mw only but that's plenty enough for my use. Honestly i like to get something without a host since i'm using it for my diy project. Paying for a pointer with a fully enclosed host and end up have to remove and never use it again feels like a waste to me. That's why i only aim for the minimalistic, less material to throw away

If it doesn't need to be exactly 532nm, you can get a cheap 525nm laser module from amazon
how does 525nm is less problematic than a 532nm may i ask? Them both are DPSS correct?
 
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Encap

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At 25$ range i think i'm gonna go with a violet diode. There is some seller put up on the shelf a 500mw emmiter for 30$ or something like that. One of the client commented that he measured true output was 300mw only but that's plenty enough for my use. Honestly i like to get something without a host since i'm using it for my diy project. Paying for a pointer with a fully enclosed host and end up have to remove and never use it again feels like a waste to me. That's why i only aim for the minimalistic, less material to throw away


how does 525nm is less problematic than a 532nm may i ask? Them both are DPSS correct?
520 nm and 525nm are both direct diode --not DPSS

Violet is OK if you have no need for much visibility.--- At same output power and beam profile--532nm is about 10X visually brighter than 450nm which is 10X brighter than 405nm so...
 
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