average ranges

what would be the average range for a laser around 200 mw on a clear night the beam and then the dot ect ? ive seen vids from 5 miles ect how much further could it go in the right conitions very clear night ect anyone know ?

also would u be able to get more range out of an adjustable focus laser?

really nobody has anything to say here ? surely someone has tested this out ?

Light don't stop at certain range. How you see the dot depends on several factors.
Color of the laser, power output, divergence of the laserbeam, quality of the air.

On a clear night you won't see the dot at all. How suppose the dot will projected on ?

Blord said:

Light don't stop at certain range. How you see the dot depends on several factors.
Color of the laser, power output, divergence of the laserbeam, quality of the air.

On a clear night you won't see the dot at all. How suppose the dot will projected on ?

Click to expand...

obivously i know that i mean how far will the dot be visible on an object from personal experience what is the most you have seen ect on a building or something.


there is a big unmanned lighhouse near me and i might try to see if i can hit it from a few miles away just wondering how far most have been able to see the laser from

divergence will be your biggest issue here, you might hit it but if the dot is 10 meter diameter...

@kingtut
Please start using punctuation... Seriously
Reading it like you wrote it just hurts the brain unnecessarily.

LOL!
I automatically add the grammar and correct spelling as I read it.
The 733T has to be pretty severe before I notice now ^_^

In very dry(low humidity) clean air it will go much further and paradoxically will be hard to see, in the air. The lighthouse would however reflect a brighter spot, if the divergence is extremely low. Low divergence high power green lasers being "more" expensive.

Range of a Laser Pointer

Lay persons often ask what is the range of a laser pointer is, and responding to this interest some producers specify some more or less questionable numbers.

If the question is meant to be how far the light of a laser pointer can propagate, the correct answer is that there is no limit, provided that the light is not absorbed or scattered away in the atmosphere. However, the beam area will eventually become larger due to the beam divergence, so that the intensity e.g. on a screen will be reduced even if the overall power remains constant. Accordingly, an airplane pilot looking down into such a beam from an altitude of 10 km will not be disturbed by the remaining small intensity.

The range of a laser pointer may also be understood as the maximum distance from which the spot on the screen can be seen. That kind of range is normally not limited by the beam divergence but by the overall optical power (apart from the wavelength and level of ambient light), since the issue is not the comparatively minor divergence on the way from the laser pointer to the screen, but rather the huge divergence of the scattered light on the way back. Therefore, someone standing next to the illuminated screen would easily see the spot when it is already hardly perceivable from the position of the laser pointer.

http://www.rp-photonics.com/laser_pointers.html

^ Yes that's true and green lasers being DPSS makes divergence a big issue in general.

what about say for example an over spec 150 mw hulk at 175 mw with a divergence of 1.2mRad.

how far could i expect that to reach in the best conditions.

also for lasers of around 150 and 200mw what would be the lowest divergence.

thanks