Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Laser Pointer Store

Long distance ~2km invisible laser

sotic

New member
Joined
Jan 1, 2016
Messages
8
Likes
1
Points
0
Hi all
Please guide me in buying a laser with following specs:
* distance approx 2km
* invisible
* very small spot at 2km
* less power hungry

Kindly help me!
 

Hap

Super Moderator
Staff member
Joined
Sep 5, 2013
Messages
8,443
Likes
1,584
Points
113
Laser light will travel infinitely until it hits an object, but divergence is a major factor in how well narrow the laser light will be at far distances.

Why do you need an invisible laser to reach distances of 2KM? What are you attempting to do? :yh:

-Alex
 

Alien Laser

Well-known member
Joined
Oct 6, 2015
Messages
1,137
Likes
678
Points
113
what are you trying to do hit somebodys house in 2km range hahah
looks like your on a mission :whistle:
 
Last edited:

ElectricPlasma

Super Moderator
Staff member
Joined
Dec 11, 2015
Messages
1,606
Likes
932
Points
113
He wants to hit the death star above you:eek:
Not good :p

-Alex
:crackup: :crackup: :crackup:


OP, it basically depends on what you mean by "invisible". My guess is you mean invisible to the human eye. I suppose infrared would work for this, however keep in mind inferred will still do damage to the human eye, be sure to use appropriate laser safety goggles/glass with also appropriate OD.

I don't know much about infrared, but I'm sure a beam expander would work to have a pinpoint focus... but you would need a pretty good expander to work and get rid of divergence for 2km.

I'm sure hitting the death star is an important priority for you, but what are you actually trying to do here? :crackup:

EDIT: Does win10 really not know the word 'infrared'? had it auto correct on me twice in this post lol
 
Last edited:

RedCowboy

Well-known member
LPF Site Supporter
Joined
Jul 10, 2015
Messages
6,834
Likes
1,653
Points
113
Are you looking to make an invisible trip line?
What's your purpose?
 

sotic

New member
Joined
Jan 1, 2016
Messages
8
Likes
1
Points
0
Thanks for the responses guys!
I am trying to make a outdoor rifle simulator,basically,a sniper. The required range is 2km.
Invisibility is mandatory because we don't want the learner to see where he is shooting.
 
Last edited:

Encap

Well-known member
Joined
May 14, 2011
Messages
4,577
Likes
1,395
Points
113
Thanks for the responses guys!
I am trying to make a outdoor rifle simulator,basically,a sniper. The required range is 2km.
Invisibility is mandatory because we don't want the learner to see where he is shooting.
???

Just tell him to keep his eyes closed or blindfold him
 
Last edited:

sotic

New member
Joined
Jan 1, 2016
Messages
8
Likes
1
Points
0
Hi Encap
Basically the firer should not get shooting clue or visible guidance to aim. So, we can't blindfold him. Laser shot is simulating the real shot. The problem is getting a laser for such range, and as somebody correctly mentioned, in IR spectrum.
 

Encap

Well-known member
Joined
May 14, 2011
Messages
4,577
Likes
1,395
Points
113
Hi Encap
Basically the firer should not get shooting clue or visible guidance to aim. So, we can't blindfold him. Laser shot is simulating the real shot. The problem is getting a laser for such range, and as somebody correctly mentioned, in IR spectrum.
Sound pretty useless to me as sniper anything

Shooting a laser beam at a the speed of light at a target 1-2km away is not at all like shooting a bullet --totally different.
 

RedCowboy

Well-known member
LPF Site Supporter
Joined
Jul 10, 2015
Messages
6,834
Likes
1,653
Points
113
You cant simulate bullet drop without a rangefinder too as drop is progressive.
 

ElectricPlasma

Super Moderator
Staff member
Joined
Dec 11, 2015
Messages
1,606
Likes
932
Points
113
Sound pretty useless to me as sniper anything

Shooting a laser beam at a the speed of light at a target 1-2km away is not at all like shooting a bullet --totally different.
The OP could calculate the time it takes for a bullet to travel the said distance, and set a delay for the laser after the "trigger" is pulled on the "sniper". This would give fairly accurate timing, but to implement physics into the simulation is beyond me.

Note if the delay was pre-set, the distance would have to stay constant to the delay. If the distance were to vary, the delay would have to be calculated every time, which is also beyond me.
 

sotic

New member
Joined
Jan 1, 2016
Messages
8
Likes
1
Points
0
Dear all
With due regards, please de-link the purpose from requirement. We just focus on laser the way it is required. Rest of the ballistics,delay etc, I can manage. Big issue is LASER.
Regards.
 




Top