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The affective ranges of these weapons are minimal and not "tactically significant." For the proper operation, they have to be positioned near the site where the missile, UAV, or other airborne object will be launched from.

I'm building an external mirror cavity, so like you said I think that affects the focal point.

I was just calculating the divergence using this formula: 2arctan((D1-D2)/2L) where D1 and D2 is the diameter at the two places and L is the distance between them. You are correct in stating that I refer to the focal point, but I don't think a HeNe is collimated unless you put the beam through...

Re: Calculating Beam Waste Oops, typo there. Waist is what I'm referring to. For curiosity's sake, what is the beam waste?

So I have a HeNe laser, and I want to calculate the waist. I know how to calculate the divergence, using the knife edge technique, and I was under the impression that the waist could be calculated the same way. I haven't been able to find too much info on it, however. Can anyone point me in the...

I haven't yet ordered a tube. I'm having a bit of difficulty finding one. Apparantly Melles Griot doesn't have them listed on their site, but I ordered a calalog. I think we're planning around 9-12 inches. I did see one on a seemly more questionable site that was about 13.7in I believe. I'll...

Yes, that sounds correct. So are we saying that Silver coated mirrors will NOT work for this use and I need dielectric ones?

Hmm, I'm not quite sure. I know it's external mirrors, and he wants silvered ones. I think he said he wanted the tube to have two "windows" Does that help? If you haven't noticed, I'm not too knowledgeable about this stuff yet >.> EDIT: From Sam's FAQ "High performance HeNe lasers may have...

So, I've got the details. 632.8, we are buying a tube, 2 brewster, and 2 external mirrors. He wants me to find Silver 1-2cm diameter mirrors, AR coated. One 100% reflective(or close) and the other ~98% reflective. I've checked all the sites I've been given so far without much luck. Any ideas?

I do know its going to be red, but other than that I'm not yet sure of specifics. I'm going to find everything out at work tomorrow and then I'll update you guys. I do think its an external mirror cavity though. I think he's already got a tube. I'm probably not qualified enough to build that...

Hio Backround: I got hired for a summer internship with the DOD in....a LASER testing facility! Pretty sweet right? I get to play with anywhere from 10W-100W lasers everyday. Most of its IR though, so not as much fun. Anyway to the point. My boss says I can build a HeNe laser, but he want's...

I did finally find a review in which an owner addressed it. There is somewhat of a spring on each side, but the larger spring was the "-". "+" went towards the tail cap. Thanks guys.

So I just got it, and I'm wondering which way to put in the battery. Here are the instructions given: "Never put battery in reverse polarity, the battery "-" towards outside (tailcap)" So does that mean reverse polarity is when the battery - is towards outside? Or does it mean that - towards...

I did get an email from paypal. I went on skype and talked with Suzie who was very helpful. After a bit of encouraging, I got her to promise me she would ship it first thing in the morning. ETA 14 days =) Thanks guys

I ordered from O-Like because everyone says the have a great rep, but its been 3 days since I made the paypal payment...and I have yet to get any sort of email from them. I have used the contact us form twice, with no reply yet. Anyone have any experience with this situation?

Wonderful, thanks for your responses. One more question: assume I am outside, and I point the laser at a wall straight in front of me for a few seconds. Assuming I do not have goggles, what approximate distance would that wall need to be away from me to prevent vision damage? Basically, could...

I just bought a 50mW greenie from O-Like My understanding is that using it for outside use, starpointing etc, I won't need glasses. But my super-smart PhD brother is telling me that it's still going to reflect off dust particles and stuff and I'll need glasses. The reason I don't really want...

Hah. Makes me want to go start my own company and sell expensive laser hosts with nothing inside them for 100's of dollars. Yeah...this is a Herc. Oh yeah, only $200. Yep, up to spec, great deal. /sarcasm.

Wonderful. I think I'll go for that then. How long is the battery life on these rechargeable CR-2's? I'm hoping they are atleast 1hr+ and won't require me to purchase multiples to recharge.

Yeah but if they ship it to US, its not my problem unless customs takes it right? Do all the Americans here seriously not buy >5mW?