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Old 03-24-2015, 06:54 AM #1
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Default welding glass for 532nm or IR laser

Before you say no (without reading), I'm alredy know that is very very not recomendable.
I get a piece of welding glass for a mask, I alredy read about the bad idea of using for protection since only work for a UV, now, I own a cheap 532nm "100mW" laser (not idea the real mW), I know it bleeds IR, I have work with IR ligth before, a few moths ago I mod a digital camera (an some webcams) to a IR camera, I test the laser with it and emit a lot of IR (nothing new). So I get the welding glass for another purpouse, to used as polarized filter for long exposure photos in sunligth, but the glass is too much darker that I tougth, I can se a really few things, mostly only withe things in direct sunligth, so I tested for IR filtering with the camera, I expect to see it almost translucid (sun glasses are almost clear in IR camera) but it seams that block all the IR the camera can detect, I even pointed to the sun a I can barely see a yellow circle, then I tested with an full-range camera (another camera moded, but without filters, can see UV as well as IR and visible ligth) for UV with some leds I have (400nm aprox), the camera can see just a little point of the leds, with red leds can see better, but IR leds not even a point, and those are more bright. So next step was tho test the laser, the IR camera can see an bright white point, and the full-range get so much light taht I'm not sure if it's white, green, or mix of two, depends on surface and angle, with the glass in front of the lenses the IR camera can see a little green dot (the filter are not perfect and let pass some color ligth if is very strong), the same for the full-range, none of the two see the white dot which should be the IR, so my question is:
is it possible the glass can work as IR filter? I'm not saying replacing safety glass, but if works it can be used for a window or as an temporal o emergency protection (for a visitor or someone who wants to see the laser dot or something like that, first case that come to mi mind) for a non long expose.
I don't have the cameras with me rigth now but for tomorrow I can publish some photos if anyone interested.
Sorry if it was too much text.
Thanks.


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Old 03-24-2015, 05:50 PM #2
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Default Re: welding glass for 532nm or IR laser

Welding filters are not all created equal, and different shades (darkness levels) block different areas of the spectrum. The ideal one -can- be used to block -certain- IR wavelengths, but NOT VISIBLE wavelengths.

Your camera tests are not to be trusted though since you didn't use camera filters with known transmissivity to determine the presence of IR without VIS contamination, and your cameras are not proven to be sensitive enough to nonVis light. So, disregard their results.

If you saved the internal cut filter "hot mirror" (bluish glass over camera sensor) this can be used as an IR-block filter to apply to your green laser to stop it from leaking IR. This males your laser safer for normal proper viewing only.

Invest in proper safety glasses. Only use welding filters if you have a calibrated LPM and either a spectrometer or lab grade spectral filter assortment needed to accurately measure the light hazard.
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Old 03-24-2015, 06:52 PM #3
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Default Re: welding glass for 532nm or IR laser

Yeah, I'm aware of the camera probably only see up to 1000nm or even less, I haven't measure it.

I have the hot mirror stored somewhere, I'll used for this.

I ordered a few weeks ago glasses from laserpointerpro, now I know here may be not the best option so I'm looking for something better.

Thanks.
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Old 03-25-2015, 04:07 PM #4
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Default Re: welding glass for 532nm or IR laser

Quote:
Originally Posted by Sigurthr View Post
If you saved the internal cut filter "hot mirror" (bluish glass over camera sensor) this can be used as an IR-block filter to apply to your green laser to stop it from leaking IR. This males your laser safer for normal proper viewing only.
Sorry to hijack....I've had this for some time, is it a "hot mirror"? If you know. IIRC got it from a camera

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405nm Ehgemus host 900mW (peak 635mW 3E lens) had 2 both died in first minute
450nm home made labby NUBM44 6w (peak 7.2w)
445nm Ehgemus RPL host 3W (peak 3.5W)
445nm home made labby 3W (peak 3.1W)
445nm 501b by Blord 2.5W (peak 2.7W)
447nm Dragon Lasers Spartan 1W (peak 1.3W)
520nm custom Ehgemus host NDG7475 1W (peak 1.5W)
520nm Ehgemus host PL520-B1 120mW (peak 143mW)
532nm labby 500mW (peak 630mW)
532nm Dragon Lasers Viper 75mW (peak 122mW)
532nm C6 host (peak 103mW)
532nm E-Bay 303 host 200mW (peak 95mW) 15% IR
589nm Dragon Lasers Spartan 50mW (peak 115mW)
650nm C6 host (peak 153mW)
650nm E-Bay 303 host 200mW (peak 141mW) 75% IR
650nm DVD diode Mini Mag host 54mW (my first build)
650nm dollar store mini pen 5mW X2

808nm Wicked Lasers E2 400mW (peak 598mW)

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Dragon Lasers 10x Beam Expander
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Dragon Lasers DGTBF
Dragon Lasers LSG02 goggles 190-548nm
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Old 03-25-2015, 05:35 PM #5
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Default Re: welding glass for 532nm or IR laser

Quote:
Sorry to hijack....I've had this for some time, is it a "hot mirror"? If you know. IIRC got it from a camera
That looks too thick for a hot mirror, the ones I extracted are actually pretty thin (extremely fragile) and reflect in color green or pink, depend on angle.
I think you can test it with a TV remote control and a camera, put it between and check if it block the ligth from the remote, some smartphone's frontal cameras has a very weak ir filter, so it should be a better option to test.
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Old 03-25-2015, 05:58 PM #6
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Default Re: welding glass for 532nm or IR laser

Thanks I will be trying the camera trick to see if it blocks ir
__________________
Lasers:
405nm E-bay 303 host (peak 113mW) 13% IR dead
405nm Ehgemus host 900mW (peak 635mW 3E lens) had 2 both died in first minute
450nm home made labby NUBM44 6w (peak 7.2w)
445nm Ehgemus RPL host 3W (peak 3.5W)
445nm home made labby 3W (peak 3.1W)
445nm 501b by Blord 2.5W (peak 2.7W)
447nm Dragon Lasers Spartan 1W (peak 1.3W)
520nm custom Ehgemus host NDG7475 1W (peak 1.5W)
520nm Ehgemus host PL520-B1 120mW (peak 143mW)
532nm labby 500mW (peak 630mW)
532nm Dragon Lasers Viper 75mW (peak 122mW)
532nm C6 host (peak 103mW)
532nm E-Bay 303 host 200mW (peak 95mW) 15% IR
589nm Dragon Lasers Spartan 50mW (peak 115mW)
650nm C6 host (peak 153mW)
650nm E-Bay 303 host 200mW (peak 141mW) 75% IR
650nm DVD diode Mini Mag host 54mW (my first build)
650nm dollar store mini pen 5mW X2

808nm Wicked Lasers E2 400mW (peak 598mW)

Expanders & Googles etc:
Dragon Lasers 10x Beam Expander
Dragon Lasers "new" 2x Beam Expander
Dragon Lasers DGTBF
Dragon Lasers LSG02 goggles 190-548nm
Eagle Pair SL-BLG2 goggles 190-540nm

LPM:
nospin Ophir 20c-A-1-Y MrCrouse full wrap heatsinked

Flashlights:
Fenix tk61vn
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