Old 07-03-2013, 12:20 AM #1
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Default Problem with new laser pointer

Hi to everybody!

I recently bought a 5mW green laser pointer (china made) and I have a probem. It's normal it comes with a bad momentary on/off button?

Example: bad contacts, instability, because when I power on the laser pointer, the output power decreases abruptly after one second and still low unless I release the switch, moving the button with finger makes the output to be unstable.

I have other laser pointer from china, manufactured by "Shenzhen Lanos Technology Co. Ltd" sold as 200mW, but I don't know how much power they have, comparing the two, the output power of my new laser pointer is too weak!

I need help to fix my new laser pointer, i spend R$30,00 with this and R$31.60 with the rechargeable batteries. Maybe change the switch might help, but I don't know how to do this,

(Sorry for my bad english, I'm brasilian )

Here my new laser pointer:



Here my old laser pointer:


Here my new laser when I press the on button:


Here after some seconds on:


Here my old laser for comparision:


Anybody know howto change the switch button?


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Old 07-03-2013, 12:24 AM #2
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Default Re: Problem with new laser pointer

it may not be the button, i think your laser has the "shitty china laser" disease it could be the diode or the driver that is failing. id say send a message saying the laser is defective then get your money and buy tihs LP 515nm 532nm 1-150

they are 100X better and are the power they say they are, your 200 could really be a 200mw that drops to 5mw or even 1mw or less,
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Last edited by firelaser; 07-03-2013 at 12:26 AM.
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Old 07-03-2013, 12:45 AM #3
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Default Re: Problem with new laser pointer



I think my 200mW laser pointer is 5mW, on the adhesive that comes with "Danger Laser Radiation" the power was < 200mW, on the box that comes with my laser pointer, was < 5mW, but I'm very satisfied, it's working for 6 months. So, isn't this laser with the problem.

Thanks for the suggestion, but here on Brazil is very complicated to buy from other countries.

I will contact the seller and request a new one, maybe the new comes Ok.
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Old 07-03-2013, 12:51 AM #4
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Default Re: Problem with new laser pointer

I seriously doubt your laser would output anywhere near 200mW, probably 50mW at best. A lot of the cheap chiinese lasers have unstable outputs like that, after a few seconds it just dims to almost nothing. You can try getting it replaced, but it's much easier just to get your money back and buy a laser from a reputable company.
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Old 07-03-2013, 02:27 AM #5
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Default Re: Problem with new laser pointer

Good, do you know some reputable company that ships to Brazil? This laser pointer cost R$30.00, in dollars, U$12.10, my other laser cost U$12.25, I bought from here (Ciudad del Este - Paraguay).

I have tried and after some warm up, the laser worked with the full power! Not good because around the dot has a mist of green spots, thing that doesn't occur with my unreal 200mW.

Little power:


Medium power:


Full power (see the green dots around the big dot):


So, thanks!

Last edited by alessnilsen; 07-03-2013 at 02:34 AM.
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Old 07-03-2013, 02:34 AM #6
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Default Re: Problem with new laser pointer

Try laserbtb.com they have had some really good products. Not sure if they ship to Brazil or not but a quick search and you will find out. Good luck!
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Old 07-03-2013, 05:03 AM #7
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Default Re: Problem with new laser pointer

its most likely not the button, cheap chinese lasers have a cold start period where the laser is cold, the output is low, sounds stupid but try holding it under your shirt to warm it up, this is so the crystals in the module warm up to the optimum output temperature. if this doesn't work its most likely stuffed

next time buy from a reputable laser company, the ones listed above are a great option, they'll be 10 times the quality
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Old 07-03-2013, 05:43 PM #8
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Default Re: Problem with new laser pointer

Yes, I percept this with this chinese laser, I need to hold it on my hand once it warm up, after this, the output of the laser becomes stable.

Remember that I said that have a mist of green dots around the big one? How I can fix this? Maybe dirty lens.

Quote:
next time buy from a reputable laser company, the ones listed above are a great option, they'll be 10 times the quality
Well, when I have more money, I will invest on reputable laser pointers.
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Old 07-07-2013, 11:45 PM #9
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Default Re: Problem with new laser pointer

Hi all! I have sold my cheap laser pointer to another person and I got my money back, I ordered other laser pointer named as JD-851 and with 5mW of power, I only can find 5mW lasers here, nothing more powerfull

Good, I spent R$40.00 with this new laser and R$15.00 with the battery CR123A that it used. When I switched on the laser I only can see infrared light (of course, seeing it with my cell phone camera), have something loose inside the laser pointer, I unscrewed all the parts and got the little ring with the crystals (nd:YVO:4 + KTP) loosed from the pump diode. I sucefuly glued the cristals assembly to the pump LD, but when I tried to assembly the laser pointer I acidentaly broke one of the legs of the LD.

Now I'm waiting for a new one, how good is this laser pointer? My first impression was too bad with this defective sample.

Some pics.

The laser pointer in question:


Infrared light:


LD driver:


808nm LD:


Another view of the driver:


The cristal assembly:



Glued all together:


532nm light!!

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