Wanted: PULSAR L808 IR LASER

[V8 90]

I've removed the eye safe filter from the laser on my N750 & it's "bright" out to around 14 miles

Guess you'll be needing one of these then http://www.fas.org/man/dod-101/sys/land/row/fh-70.htm

[rocket launcher]

rocket launcher, where did you manage to find those specs mate...i couldn't find owt anywhere near as exhaustive as that
so is the filter on the "s" just some 808nm i.r filter?......seems daft to make it 250mw and then have to filter it down

silent knight, have a free bump mate lol

here is the info on the l808s go to the tech spec
http://www.pulsar-nv.com/product.aspx?prid=45

here is the info on the l808 its also in the instruction manual
http://www.extravision.com.au/catalog/p ... ts_id=1892

here is the test report for the l808
http://main.yukonopticsglobal.com/files ... cation.pdf

you cannot change the frequency (wavelengh) of a laser by putting a filter on it and you cannot change the battery time by putting a filter on it
and the cost would not nearly half by putting a filter on it

[sunndog]

i'm sure i looked on the pulsar site and could'nt find that tech spec page......oh well. got there in the end

why cant you change a laser's wavelength using a filter?.....if you put a 780nm laser behind some 808nm filter material then it would come out as 808 or there abouts, no?

[chas]

Hello Adam.

An IR filter, if it's any good, will only let through the wavelength that it's rated at, it won't change the wavelength.
So in the case of putting one rated at 808nm on a lamp (bulbed), that lamp will produce a broad spectrum of light but only the 808nm light will get through, the rest will get blocked which is why distance is reduced by fitting filters, some light is wasted as it were.
In the case of a laser, they only produce light that they are rated at in this case 780nm, so sticking an 808 filter in front of a 780 laser won't work because there is no 808 light available to pass through the filter.

How's the project going ?

[sunndog]

thanks for that chas

yeah. i dint think of it like that...a laser isn't the same as an incandesent bulb, it simply isn't producing the light so cant be filtered
(obvious when you think about it)

its a bit wrong on pulsars part to label it "808" tho. as its breaking there own naming system. plus the shops certainly give the impression the "s" is a watered down L808

tbh finding out its 780nm makes me want to buy one, rip the filter off and try it with a gen1 addon lol

projects going well. i'v nearly finished the prototype...i'll give it a proper test at the weekend and then stick some pics up

[Fox Hunter]

An IR filter, if it's any good, will only let through the wavelength that it's rated at, it won't change the wavelength.
So in the case of putting one rated at 808nm on a lamp (bulbed), that lamp will produce a broad spectrum of light but only the 808nm light will get through, the rest will get blocked which is why distance is reduced by fitting filters, some light is wasted as it were.
In the case of a laser, they only produce light that they are rated at in this case 780nm, so sticking an 808 filter in front of a 780 laser won't work because there is no 808 light available to pass through the filter.

I don't want to 'disagree' just maybe beg to differ a bit... I was under the impression a laser's nm specification was where the majority of the light is put out at, therefore there will be some below and some above the stated nm output. I've tried an 850nm filter over my laserluchs 808nm(or is it 810nm? can't remember ) 150mw laser and there is still plenty of useable light for rabbits and rats but the original range is reduced drastically but also is the red glow at source. N1000's and dipol l3's don't seem to perform anywhere near as good with the 850nm filter as the laserluchs even though they are higher powered so for me that answers a lot about the spookyness of those lasers. ie there's a fair bit of light output 'below' their stated wavelength making them so bright. (The 850nm filter isn't from china either )
Edit: I forgot to ask, doesnt the IR filter let light though, at AND above, the stated wavelength?

[camo304]

I get what ya saying James

[chas]

I don't want to 'disagree' just maybe beg to differ a bit... I was under the impression a laser's nm specification was where the majority of the light is put out at, therefore there will be some below and some above the stated nm output. I've tried an 850nm filter over my laserluchs 808nm(or is it 810nm? can't remember ) 150mw laser and there is still plenty of useable light for rabbits and rats but the original range is reduced drastically but also is the red glow at source. N1000's and dipol l3's don't seem to perform anywhere near as good with the 850nm filter as the laserluchs even though they are higher powered so for me that answers a lot about the spookyness of those lasers. ie there's a fair bit of light output 'below' their stated wavelength making them so bright. (The 850nm filter isn't from china either )
Edit: I forgot to ask, doesnt the IR filter let light though, at AND above, the stated wavelength?

Quite possibly so James, obviously a lot will depend on the laser or filter, the figures quoted and tolerances, then I think there are both narrow and wide bandpass filters to complicate matters or should I say to confuse me.
I tried to simplify my post as much as possible without using to many "if's, but's and maybe's" for fear of going full circle and disappearing to where the sun don't shine.
I would imagine this subject could go on for ever more, but without specifics would go full circle


Look on the top chart at what they class as an 850nm filter, it looks like 850nm is the 50% pass rate.
http://www.maxmax.com/aXRayTechnical.htm

[sunndog]

ok then. what about filtering higher up the i.r spectum

does a 780nm laser throw out 780 and above?...so you can filter them down but not up???
if that makes any sense at all lol

[chas]

Added another link to last post.