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Old 01-26-2016, 08:41 PM #1
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Default Cheapo 405nm laser safety questions

Greetings everyone! My first post here as I recently acquired a cheapo 405nm laser that took forever to arrive from China. For your curiosity the following link is the product details:

2016 50000mw 405 nm blue purple laser pointer flashing light adjustable focus burn match lit cigarettes purple blue laser light-in Laser Pens from Computer & Office on Aliexpress.com | Alibaba Group

Now I'm positive it's not actually a 50W laser and I doubt it's even 2 W but it certainly can ignite matches reasonably quickly at close range. My father heard I was acquiring a laser and promptly provided me with the following safety glasses:

https://www.innovam.com/en/SG05-55.html

Later today I'll actually be conducting a current draw test to determine the device's power and I'll also try to identify excessive IR emission via reflecting off a CD onto a white page and recording via webcam/digital camera. If I'm exceptionally lucky it will already have an IR filter in place though I sincerely doubt it.

This leads me to the question then of if it makes sense to add an IR filter to the aperture of the laser. I've come across some recommendations to acquire a filter and glue over the end which is fine with me however is this wise? Would there be danger of the filter melting over time (I doubt it as focus point is well past the aperture) plus would one expect to have to periodically replace the IR filter?

For my own use with the glasses acquired I should be fine as they're rated for unfiltered IR but I'd love to get some cheaper glasses for spectators at distance. The following thread from this forum cast the HDE-J74 glasses in a favourable light:

HDE Red-J74 405-532nm Safety Glasses (back to $7.95) w/ case & Free Shipping US

If I find my laser does not emit much IR or if an IR filter is a cheap recommended fix then I feel these glasses would provide adequate protection for spectators viewing from greater than 3 ft away (laser shone on non-reflective surface).

Please share your experience with me at your convenience and may the Force be with you all!


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Old 01-26-2016, 08:57 PM #2
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Default Re: Cheapo 405nm laser safety questions

Quote:
Originally Posted by Thorlak View Post
Greetings everyone! My first post here as I recently acquired a cheapo 405nm laser that took forever to arrive from China. For your curiosity the following link is the product details:

2016 50000mw 405 nm blue purple laser pointer flashing light adjustable focus burn match lit cigarettes purple blue laser light-in Laser Pens from Computer & Office on Aliexpress.com | Alibaba Group

Now I'm positive it's not actually a 50W laser and I doubt it's even 2 W but it certainly can ignite matches reasonably quickly at close range. My father heard I was acquiring a laser and promptly provided me with the following safety glasses:

https://www.innovam.com/en/SG05-55.html

Later today I'll actually be conducting a current draw test to determine the device's power and I'll also try to identify excessive IR emission via reflecting off a CD onto a white page and recording via webcam/digital camera. If I'm exceptionally lucky it will already have an IR filter in place though I sincerely doubt it.

This leads me to the question then of if it makes sense to add an IR filter to the aperture of the laser. I've come across some recommendations to acquire a filter and glue over the end which is fine with me however is this wise? Would there be danger of the filter melting over time (I doubt it as focus point is well past the aperture) plus would one expect to have to periodically replace the IR filter?

For my own use with the glasses acquired I should be fine as they're rated for unfiltered IR but I'd love to get some cheaper glasses for spectators at distance. The following thread from this forum cast the HDE-J74 glasses in a favourable light:

HDE Red-J74 405-532nm Safety Glasses (back to $7.95) w/ case & Free Shipping US

If I find my laser does not emit much IR or if an IR filter is a cheap recommended fix then I feel these glasses would provide adequate protection for spectators viewing from greater than 3 ft away (laser shone on non-reflective surface).

Please share your experience with me at your convenience and may the Force be with you all!
It's not even going to be 2W - The highest power 405nm diodes we have access to are usually doing a little under a watt and those cost more than the $10 you paid for the whole thing. ~450nm diodes go up to 6-7W at the moment - those diodes cost about 10x what you paid for the laser though, so it's not going to be one of those...

There is NO IR from a visible diode laser - the IR you get with cheap green pointers is a product of the process used to produce the green. Cheap greens are DPSS - They use an IR pump diode to pump a set of crystals, which then emit green light, some of the IR often leaks out in the process. That's a simplified rundown of the process of course.

I highly recommend spending money on decent safety glasses - go for the Eagle Pair from Survival Laser. $50 a pair is worth the peace of mind - you know they work as intended, some cheap glasses from China may not be up to scratch. Is it worth risking your eyesight to save a few bucks? Or worse - someone elses eyesight.

Edit: Saying that, looks like the glasses you linked to were tested and turned out OK. Not what I would go for as I'd prefer something tried and true/certified, but they'd be fine for viewing the dot for burning by the look of things.
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Last edited by diachi; 01-26-2016 at 09:06 PM.
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Old 01-26-2016, 09:02 PM #3
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Default Re: Cheapo 405nm laser safety questions

Yes those HDE glasses will be ok, I have some myself.

That laser is so cheap I doubt it is more than 100mw. The most powerful 405nm is about 1W. If it were even 500mW the beam would be easily visible for most people in dim lighting and it would instantly burn most anything you point it at, it would also have cost you well over $100. I have one that is 590mW and it is very dangerous, it also cost me $150 just for the parts.

Only IR or DPSS lasers can produce IR, no IR from any 405nm.

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Old 01-27-2016, 04:06 PM #4
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Default Re: Cheapo 405nm laser safety questions

I didn't have time last night to do an IR test though from the comments I should be fine there. I have read of many blue lasers being DPSS based which would produce IR. I'll still do the test then to be on the safe side.

Current measurement from negative of battery terminal to case was 0.17 A with battery voltage of 4.04 V. This would yield a power measurement then of 686 mW which is surprising for the cost but explains it's ability to burn stuff. I'm actually glad it's significantly lower than the 2W threshold but nonetheless will be exceptionally careful with it.

If I don't see excessive/any IR produced I should be fine indulging in the HDE-J74 glasses for spectators which is an economic relief. Anyone closer than 3 ft to the spot though will use my Innovam glasses and I'll likely get an Eagle pair as well to have two proper sets on hand.

Thanks again for the comments and I'll follow up later on the IR test.
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Old 01-27-2016, 04:39 PM #5
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Default Re: Cheapo 405nm laser safety questions

Quote:
Originally Posted by Thorlak View Post
I didn't have time last night to do an IR test though from the comments I should be fine there. I have read of many blue lasers being DPSS based which would produce IR. I'll still do the test then to be on the safe side.

Current measurement from negative of battery terminal to case was 0.17 A with battery voltage of 4.04 V. This would yield a power measurement then of 686 mW which is surprising for the cost but explains it's ability to burn stuff. I'm actually glad it's significantly lower than the 2W threshold but nonetheless will be exceptionally careful with it.

If I don't see excessive/any IR produced I should be fine indulging in the HDE-J74 glasses for spectators which is an economic relief. Anyone closer than 3 ft to the spot though will use my Innovam glasses and I'll likely get an Eagle pair as well to have two proper sets on hand.

Thanks again for the comments and I'll follow up later on the IR test.
473nm and 457nm are typically DPSS - 405nm is diode. Don't waste your time testing for IR, you won't find any.
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445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



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Last edited by diachi; 01-27-2016 at 04:41 PM.
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Old 01-27-2016, 07:55 PM #6
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Default Re: Cheapo 405nm laser safety questions

i think its around 100mW range perhaps a little more or less but without LPM u can never be 100% sure, if it can burn then u should be careful as 405 even high power will appear dim and look weak to the human eye u should treat it as if it was 1w laser.
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Old 01-27-2016, 08:04 PM #7
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Default Re: Cheapo 405nm laser safety questions

I have one of those pen violet lasers, it was tested to about 110mw. Yes it will burn,pop balloons when set to infinitely, when focused, light matches. The nature of the wavelength gives it more punch than those with longer wavelengths. Great for GITD fun or mineral hunting.
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Old 01-29-2016, 03:21 PM #8
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Default Re: Cheapo 405nm laser safety questions

So I did an IR test for fun and to be on the safe side. As stated in your comments I did not detect any IR produced so I'll be happy to acquire the HDE-J74 glasses.

Now you guys are suggesting that even with close to 700 mW of power draw based on battery voltage and current that the actual laser power is likely only 100 mW? Are lasers seriously that inefficient?

Indeed a laser power meter would be best but I thought a current reading would yield a satisfactorily close value. Please comment at your convenience.
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Old 01-29-2016, 03:50 PM #9
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Default Re: Cheapo 405nm laser safety questions

Quote:
Originally Posted by Thorlak View Post
So I did an IR test for fun and to be on the safe side. As stated in your comments I did not detect any IR produced so I'll be happy to acquire the HDE-J74 glasses.

Now you guys are suggesting that even with close to 700 mW of power draw based on battery voltage and current that the actual laser power is likely only 100 mW? Are lasers seriously that inefficient?

Indeed a laser power meter would be best but I thought a current reading would yield a satisfactorily close value. Please comment at your convenience.
Diode lasers are probably one of the most efficient. However, they are still not terribly efficient. Take an LPC-826 for example - it'll produce 250-300mW optical power with 400mA@3V input (1.2W) electrical. After including driver losses that'd be a similar efficiency to what you are seeing.

If you think that efficiency is bad don't get into gas lasers. A typical small air cooled Ar-ion laser will be <1% efficient. Actually, much less, probably closer to 0.01% efficient. That's what, 300W input for 30mW output? That's for a healthy tube too - some tubes will be as little as 0.003% efficient.
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405nm | Banggood LT-850 | "5mW" | Review Unit | Review WIP
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit | >>Review<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<


Last edited by diachi; 01-29-2016 at 03:53 PM.
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