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Posted: 1/26/2007 7:44:10 PM EDT
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I know its been discussed, but since I can`t search the archives, can we discuss this again got a cherokee IR laser, nice, but a 100yds or less the bloom almost can cover a foot or more circle, viewed through a pvs14 outside of running a illuminator to brighten things up and lessen the brightness of the laser has anyone played with a potentiometer on one, like the corsak has? any new tricks out there? |
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I don't believe you could vary the power input into the laser diode's power supply too much before you get it below the threshold voltage. I did no know the Corsik had a varaible output? interesting. Since your running a PVS 14, try turing the gain down a bit. Are you hunting with this set up or just a general purpose IR sighting needs? I am sure if you contact Tim for a lower powered laser he could come up with one. IPSC_GUY SIERRA II ALPHA NIGHT VISION HAS THE ALCHEMICAL CAPACITY NOT TO TURN LEAD INTO GOLD, BUT SOMETHING FAR MORE VALUABLE: IT TURNS DARK INTO LIGHT. |
| That is why I just love most of NVEC's IR lasers due to the vary power levels of some of their lasers. The PEQ-2A on it's lowest power setting sometimes has bloom. Even the PAQ-4C has some. But you can place that included yellow diffuser on the unit that really cuts out the donut bloom. |
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In a Laser diode, you can run a PWM power supply to turn the power down, but that's WAY harder and more involving than average hobbyist with no electronic experience....especially on expensive laser. Another choice you have is to put Neutral Density (ND) filter in front of the laser to effectively reduce the power......but even with reduced laser energy, you're still consuming same amount of electrical power. PEQ-2A has a ND filter that you can put in front of the laser. The part may not be as cheap as you expect.....although commonly used on photographic community (visible spectrum)....but we're talking IR here....you're running an 808nm or 880nm? Edmund Optics NIR (Near IR) ND filters Edmund has a tech learning section....should be good enough for you to get the amount of transmission with various Optical Density (OD). Question is...how much to attenuate....that depends on the power you're putting out and the gain on your NVD. Quick enough is to look at transmission percentage and OD curve response. I would go with absoprtive type. |
trying to get set up for some critter control work, with the weather getting cold, this is the time of yr that we start having dog/coyote packs come right up to the house, and at some relations place, last yr their dogs were throwing a fit, they opened the back door, and were face to face with some snarling not too friendly (they thought coyotes, I think coydogs or dogs myself) trying to be ready for the possiblility this yr, and maybe catch them out in the open, instead of reacting to them, with a whitelight on a shotgun and stepping out the door into them, the NM is 850, the filter idea makes alot of sense, might talk with a person I know who works everyday on cutting lasers he might have something laying around, that might work 
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Most if not all of NVECs IR lasers are not avalible to the public WRETCHED WORLD ! ! ! and those filters on the front of the PEQ2 need to be on there perfectly flat or the beam gets all gooned up. PEQ 2s are overated for what they are. the LDI units are MUCH better. Try the Neutral Denisty filter trick. I know you can get it in sheets of optically correct plastic for photographic use. I will look around I think I have some left over from a project. I will IM ya if I can find it. IPSC_GUY SIERRA II ALPHA NIGHT VISION HAS THE ALCHEMICAL CAPACITY NOT TO TURN LEAD INTO GOLD, BUT SOMETHING FAR MORE VALUABLE: IT TURNS DARK INTO LIGHT. |
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