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Old 02-15-2011, 06:03 AM   #1
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Default Need help in converting Joules to watts

Hi, I have an infra-red laser at 1080nm. But the output power is given as 20.5mJ instead of watts. The time given is 10mS. May I know how do I convert milijoules to watts? From what I know, my laser is a Class 3b laser.
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Old 02-15-2011, 06:15 AM   #2
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Default Re: Need help in converting Joules to watts

Do you have any pictures? Because CW it might be Class IIIB, but pulsed lasers generally have a really high peak power, a couple kilowatts easily with some systems.
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Old 02-15-2011, 06:23 AM   #3
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Default Re: Need help in converting Joules to watts

A 20.5mJ pulse over 10ms is a power of 2.05W - but since it's pulsed I think the peaks should be much higher. Definitely class IV territory.

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Old 02-15-2011, 06:42 AM   #4
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Default Re: Need help in converting Joules to watts

^If I did my math right it's about a 2.05kW pulse peak power.
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Old 02-15-2011, 11:19 AM   #5
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Default Re: Need help in converting Joules to watts

I don't have any pictures. All I have to describe is, it is a laser for distance reading, so the system can compute the distance and calculate the ballistics to fire a round.. I don't know if the Laser is pulsed or not. Besides, I also doesn't know what does pulse laser means, anyone care to explain what does pulse means?
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Old 02-15-2011, 11:22 AM   #6
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Default Re: Need help in converting Joules to watts

Quote:
Originally Posted by Prototype View Post
^If I did my math right it's about a 2.05kW pulse peak power.
You're doing it wrong
(20.5*10^-3)/(10^10^-3)=2.05W
But for laser safety it is also important to know the repetition rate.

Sounds like a laser rangefinder, definately pulsed. Are you sure the pulse is 10 milliseconds long?
About the pulsed: http://en.wikipedia.org/wiki/Laser#Pulsed_operation

Last edited by Bluefan; 02-15-2011 at 11:25 AM.
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Old 02-15-2011, 11:39 AM   #7
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Default Re: Need help in converting Joules to watts

Quote:
Originally Posted by Bluefan View Post
You're doing it wrong
(20.5*10^-3)/(10^10^-3)=2.05W
But for laser safety it is also important to know the repetition rate.

Sounds like a laser rangefinder, definately pulsed. Are you sure the pulse is 10 milliseconds long?
About the pulsed: Laser - Wikipedia, the free encyclopedia
Yes I am sure it is 10ms

Well this is the info given by my German OEM:

Wellenlänge: 1,08µm
Energie: 20,5mJ
Pulsdauer: 10ms


Using the translator, iam sure it means

Wave Length: 1,08µm = 1080nm (infra-red)
Energy: 20,5mJ
Pulse width: 10ms

so yea, it is 10milliseconds long.

But it is classified as a Class 3b, ... I just want to find the actual wattage,

nope, the OEM didn't say there is any repetition rate. It is just one flick of a Rocker Switch, it will lase whatever target we aimed at, and feedback this information to a computer to calculate the ballistic values of the round.
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Last edited by Jaxz; 02-15-2011 at 11:44 AM.
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Old 02-15-2011, 11:42 AM   #8
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Default Re: Need help in converting Joules to watts

It's 2.05W peak, but without the rep rate, the average power can only be guessed.
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Old 02-15-2011, 11:49 AM   #9
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Default Re: Need help in converting Joules to watts

Quote:
Originally Posted by Bluefan View Post
It's 2.05W peak, but without the rep rate, the average power can only be guessed.
I see. Got a question here. Does laser range finder usually comes with repetition? Or is it just shot of continuous ray? Because the switch to activate the laser is just a rocker switch. Until I release the rocker switch, it will continue to lase.
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Old 02-15-2011, 05:46 PM   #10
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Default Re: Need help in converting Joules to watts

It's pulsed, so it's not continuous. But it probably keeps pulsing when turn on.
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Old 02-16-2011, 05:12 AM   #11
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Default Re: Need help in converting Joules to watts

Hi thanks. I have clarified with the OEM. It is pulse. It doesn't keep pulsing even when the Rocker switch is hold on.

Some new info and some corrected info.

The pulse width is not 10ms, it is 10ns, nano seconds. My mistake in reading his hand writing.

And some new info, according to the German OEM, the repetition rate is 10 times to fire continuously, then got to rest a while for the laser unit to cool down before it can operate again..

Above info any useful?
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5Watt Thermopile LPM Red Display + tripod + DC adapter by nospin (Jim Myers)
5Watt Kenometer Pro LPM by Kenneth Rowe
Wickedlasers 650nm E3 ~ peak 120mW
Wickedlasers 5/532 Core (Given away as a gift)
z-bolt Premium Green Laser Pointer 5/532 - Chrome & Brass, ~ o/p only 3mW (Given away as a gift)
Jetlasers 100/532 Ti-lite A ~ peak 115mW
Jetlasers 200/532 Ti-pen ~ peak 215mW
Dragonlasers 1000/447 Spartan (Review)
Wickedlasers 1000/445 Spyder III Arctic G2 ~ peak 740mW *Pictures
Jayrob's Maglite 2D, G-1 Lens, A140 Diode, avg o/p pwr = 1400mW
RDTech's Maglite 2D, G-2 Lens, M140 Diode avg o/p pwr = 2W @ 4mins const run, Peak 2.3W (Review)
COCONUTS's REDUCED Uranium Marbles and OverSpec AAA Pens 405_532_650nm
Laser Safety Goggles from Lasersafetyindustries ~ 100-10-130 Fit-over Prescription [OD 7+ @ 190-534 nm, OD 5+ @ 850-1100 nm, OD 7+ @ 1064 nm]
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Old 02-16-2011, 05:19 AM   #12
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Default Re: Need help in converting Joules to watts

Then the pulse power is 2.05MW.

-Trevor
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Old 02-16-2011, 09:54 AM   #13
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Default Re: Need help in converting Joules to watts

i see. thanks.

Anyone can tell me what is the recommended laser safety goggles to wear when operating with this laser ranger finder?
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Jetlasers 100/532 Ti-lite A ~ peak 115mW
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Dragonlasers 1000/447 Spartan (Review)
Wickedlasers 1000/445 Spyder III Arctic G2 ~ peak 740mW *Pictures
Jayrob's Maglite 2D, G-1 Lens, A140 Diode, avg o/p pwr = 1400mW
RDTech's Maglite 2D, G-2 Lens, M140 Diode avg o/p pwr = 2W @ 4mins const run, Peak 2.3W (Review)
COCONUTS's REDUCED Uranium Marbles and OverSpec AAA Pens 405_532_650nm
Laser Safety Goggles from Lasersafetyindustries ~ 100-10-130 Fit-over Prescription [OD 7+ @ 190-534 nm, OD 5+ @ 850-1100 nm, OD 7+ @ 1064 nm]
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Old 02-16-2011, 10:46 AM   #14
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Default Re: Need help in converting Joules to watts

Quote:
Originally Posted by Jaxz View Post
Hi thanks. I have clarified with the OEM. It is pulse. It doesn't keep pulsing even when the Rocker switch is hold on.

Some new info and some corrected info.

The pulse width is not 10ms, it is 10ns, nano seconds. My mistake in reading his hand writing.

And some new info, according to the German OEM, the repetition rate is 10 times to fire continuously, then got to rest a while for the laser unit to cool down before it can operate again..

Above info any useful?
Quote:
Originally Posted by twhite828 View Post
Then the pulse power is 2.05kW.

-Trevor
(20.5*10^-3)/(10^10^-9)=2050000W = 2050kW = 2.05MW peak
The average power @10hz: 10*20.5*10^-3 = 0.205W average
You'll probably need laser safety eyewear rated D 1080nm L3, R 1080nm L6, depending on the beam diameter.

Last edited by Bluefan; 02-16-2011 at 11:13 AM.
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Old 02-16-2011, 01:00 PM   #15
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Default Re: Need help in converting Joules to watts

may i know what does this means? D 1080nm L3, R 1080nm L6.What is the OD i need to get?
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Jetlasers 100/532 Ti-lite A ~ peak 115mW
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Dragonlasers 1000/447 Spartan (Review)
Wickedlasers 1000/445 Spyder III Arctic G2 ~ peak 740mW *Pictures
Jayrob's Maglite 2D, G-1 Lens, A140 Diode, avg o/p pwr = 1400mW
RDTech's Maglite 2D, G-2 Lens, M140 Diode avg o/p pwr = 2W @ 4mins const run, Peak 2.3W (Review)
COCONUTS's REDUCED Uranium Marbles and OverSpec AAA Pens 405_532_650nm
Laser Safety Goggles from Lasersafetyindustries ~ 100-10-130 Fit-over Prescription [OD 7+ @ 190-534 nm, OD 5+ @ 850-1100 nm, OD 7+ @ 1064 nm]
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Old 02-16-2011, 10:05 PM   #16
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Default Re: Need help in converting Joules to watts

OD 6 at least, but it's more important to get quality goggles. With megawatt peak powers you don't want cheap goggles, they may bleach under these intensities, like the passive q-switch effect. The D 1080nm L3 rating and the R 1080nm L6 is the rating of the EN207 certification, it makes sure your goggles can withstand the peak and average power of you laser.
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