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NV Laser

Discussion in 'Night Vision Optics and Illumination' started by tinmanofkent, Sep 17, 2014.

  1. tinmanofkent

    tinmanofkent Tiger King

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    Could anyone tell me if it is possible to have a laser that sends out invisible IR light?

    James
     
  2. whitevanman574

    whitevanman574 bell target champion

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  3. some bloke

    some bloke Busy Member

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    Yes and no. "invisible light" is a myth put out there by vendors to con gullible buyers.

    Yes - if you stand behind the emitter so your human eyes don't see the beam, nor what it illuminates.

    No - if you are the quarry looking at the source of that light you will see it deliberately focused into your night adjusted eyes.
     
  4. r10hunter

    r10hunter Honorary Member

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    Depending on the wave length of the laser 940nm and 980nm lasers are totally invisible to human and quarry eyes as far as I am aware.
    If I look back at my spotter in the dark I see nothing ( 940nm)
    http://www.scottcountry.co.uk/products-Laserluchs-50mW-IR-Laser-Illuminator-980nm-4923.htm
    Cheers Andy
     
    Last edited: Sep 18, 2014
  5. terry1001

    terry1001 Major Poster

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    There are lasers available in ir wavelengths but they do tend to produce a 'dirty' beam with speckles etc in it rather than the clean, even illumination you get with a led torch.
    I'm afraid that it will always be a mystery as to what the quarry can see, other species have different eyesight to ours and we shouldn't assume anything based on our own observation of an illuminator. The light is quoted as having a specific wavelength but generally there will be light emitted outside that value which is how you can see a dim red glow from an ir source at 850nm, what you can actually see is the tiny bit of red light which is emiited and is likely to be much less than 1% of the total output.
    If you have a look here http://odicforce.com/shop/category_...MjjxYb6BmH50FsC2CQUcPQ7Bll9c&shop_param=cid=& you will see a selection of ir lasers but they are shorter wavelength than is normally used for led torches and will be slightly less covert. If you simply want to get longer range from an illuminator it might be better to think about a led torch fitted with one of the larger aspheric lens conversions although these will be larger and heavier which may be a consideration for rifle mounting. However they will give a better light and can be specified with 900+nm leds if you really want to be as covert as possible. The only downside to using 900nm as opposed to 850nm is that you will need to focus the beam more tightly to get the same range as the normal cameras used for nv are aboy 1/4 as sensitive to the longer wavelength.
     
  6. tinmanofkent

    tinmanofkent Tiger King

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    I was hoping to add an invisible laser dot to my Pitch Black Hunter NV. My idea was to zero both units to 30 yards and then range find by the difference of the dot above/below the crosshairs.

    Is this feasible?
     
  7. harry brown

    harry brown Banned BANNED

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    Not wanting to teach you to suck eggs, but I wouldn't be looking into any IR light/torch/laser if I were you. We used to be advised pointing the IR torch at dogs for long enough in NI would blind them. I don't know as I never intended trying but I bet it wouldn't do any good.
    https://answers.yahoo.com/question/index?qid=20080828165400AAGX8tK
     
  8. r10hunter

    r10hunter Honorary Member

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    Modern ir lasers are eye safe but I would still not give one more than a quick glance at long range don't worry.
    Cheers Andy
     
  9. r10hunter

    r10hunter Honorary Member

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    Lots of people have tried its very hard to get it to work.
    The laser will be too bright and cause a huge flare spot or not bright enough for you to see it above your ir torch.
    People have tried filters reducing voltage to the laser ect but it's hard to get it to reliably work in all lighting conditions and ranges.
    Cheers Andy
     
  10. terry1001

    terry1001 Major Poster

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    Andy is quite right, the laser dot just flares out the area around it and makes it useless. Reducing the intensity MIGHT let you use it for rangefinding but it might be too dim on some targets and too bright on others. If you could find one about 1mw it might be worth a try but it would probably be a bare unit with no adjustment facility. The other thing you ought to think about is the separation you can get between the laser and the line of sight of the PB. I would think that 6" is about the minimum you would need to get reasonable accuracy. You can get an idea by using Chairgun which has an option for adding a laser line and checking where the laser intersects the reticle markings, it's only going to be a guide but could be helpful as you can check the effect of raising the laser.
     

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