Old 04-17-2016, 06:37 PM #1
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Default IR laser for NightVision (Newbie)

Hello,

I need an IR laser for my NOD setup and since they are quite expensive, I want to try building it myself.
I've done some research but I still have some questions.

What I need :
- Something as reliable as possible, so decent quality components
- 850nm eye safe
- Smallest size possible (1xCR123)
- Waterproof (well more like weatherproof, but the more the better)

I've found several hosts on odicforce or ebay but every time it says "for green laser module" "for red laser module" ... Is there a difference ?
They are also too big for my project

Is this a good quality IR module ? Aixiz 850nm 5mW 3.2V with adjustable lens
850nm 5mW Laser Module 3 2VDC W ADJ Lens 850nm | eBay
I'm gessing 5mW is safe for outdoors, what about indoor ?

Thanks



Last edited by Opi; 04-17-2016 at 06:37 PM.
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Old 04-17-2016, 11:10 PM #2
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Default Re: IR laser for NightVision (Newbie)

Buy just about any cheap 532nm green laser pointer and remove the KTP crystal from it to turn the laser into a 808nm laser light source. Although it won't focus to as tight a beam anymore without further modification, that probably isn't what you need for a IR light source anyway. Without the KTP crystal inside, this one will put out over 200 mw of IR light:

http://www.ebay.com/itm/5miles-532nm...-/121895362966

Not enough power? Find a higher power output 532nm laser and remove the KTP crystal, but I don't know which ones lend for easy modification except the lower power one I just linked to, above.

Here's a link to one I modified:

http://laserpointerforums.com/f40/co...ser-91151.html

Any of the so-called eye safe lasers at longer wavelengths are just less of a hazard in different ways, but certainly not completely "safe" so don't think they are. Enough energy in a tight spot at any wavelength whether coherent or not can still burn. Just that some of the longer wavelengths will burn your cornea first instead of the retina first, either way a problem if not handled safely.

If you want to find a cheap IR LED light source, just search ebay, there are lots of them and probably better suited for your needs than modifying a 532nm laser pointer.

i.e. http://www.ebay.com/itm/Mastiff-M2-5...-/271228071392
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 04-17-2016 at 11:25 PM.
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Old 04-18-2016, 05:30 PM #3
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Default Re: IR laser for NightVision (Newbie)

Quote:
Originally Posted by Opi View Post
- 850nm eye safe
What do you mean by eye safe?
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Old 04-18-2016, 08:20 PM #4
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Default Re: IR laser for NightVision (Newbie)

Quote:
Originally Posted by Alaskan View Post
Buy just about any cheap 532nm green laser pointer and remove the KTP crystal from it to turn the laser into a 808nm laser light source. Although it won't focus to as tight a beam anymore without further modification, that probably isn't what you need for a IR light source anyway. Without the KTP crystal inside, this one will put out over 200 mw of IR light:

5MILES 532nm Green Laser Pointerstrong Pen High Power Powerful 8000M Pointer BN | eBay

Not enough power? Find a higher power output 532nm laser and remove the KTP crystal, but I don't know which ones lend for easy modification except the lower power one I just linked to, above.

Here's a link to one I modified:

http://laserpointerforums.com/f40/co...ser-91151.html

Any of the so-called eye safe lasers at longer wavelengths are just less of a hazard in different ways, but certainly not completely "safe" so don't think they are. Enough energy in a tight spot at any wavelength whether coherent or not can still burn. Just that some of the longer wavelengths will burn your cornea first instead of the retina first, either way a problem if not handled safely.

If you want to find a cheap IR LED light source, just search ebay, there are lots of them and probably better suited for your needs than modifying a 532nm laser pointer.

i.e. Mastiff M2 5 Watt 850 Infrared Radiation IR Night Vision LED Flashlight Torch | eBay
The first one you linked is too big and already way too powerful IMO.
I already have a LED light for illumination, I need a laser for designation.

Quote:
Originally Posted by TheDukeAnumber1 View Post
What do you mean by eye safe?
Well basically something that won't ruin my eyes if it bounces off a reflective surface or something.
For example here's the streamlight tlr2 IR (vis LED/ IR laser combo). The IR laser is 0.8 mW and considered "eye safe"
Amazon.com: Streamlight TLR-2 IR Eye Safe LED Flashlight with Lithium Battery: Sports & Outdoors
The output is really low compared to what I've seen here (but the price is really high )

Last edited by Opi; 04-18-2016 at 08:23 PM.
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Old 04-18-2016, 08:33 PM #5
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Default Re: IR laser for NightVision (Newbie)

Will it be used for illumination? Or do you want a tight beam and low divergence?
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Old 04-18-2016, 08:57 PM #6
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Default Re: IR laser for NightVision (Newbie)

Quote:
Originally Posted by TheDukeAnumber1 View Post
Will it be used for illumination? Or do you want a tight beam and low divergence?
No illumination, I've got a LED for that. So yes a tight beam would be good.
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Old 04-18-2016, 09:23 PM #7
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Default Re: IR laser for NightVision (Newbie)

We just stepped out of my wheelhouse but now that we know what you're looking for someone should be able to help you out. I've been using 808nm lasers for long range illumination but with high divergence.
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Old 04-20-2016, 06:09 PM #8
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Default Re: IR laser for NightVision (Newbie)

If you want a IR laser with a tight beam like a normal visible laser has with a mRad of under 3.0 you might find one on ebay, but the ones I've seen lately are far higher power than 200mw, as you might get by modifying a 532nm DPSS pointer I gave the link to. What output power is just right for your needs?
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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