Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the Laser Company Top Sites List. The link will open in a new window for your convenience.

Colorful 2018, Colorful Laser Power Meter
 Laser Pointers "Burning Power" unit of measurement please?

LPF Laser Pointer Company Database (link opens new window)

06-15-2009, 08:04 PM #17
 Class 3B Laser Join Date: Feb 2008 Location: Lincoln, NE Posts: 2,989 Rep Power: 7447
Meatball
Class 3B Laser

Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 7447

Quote:
 Originally Posted by lasersbee The other variable is focus... I've heard members complaining that their 100mW Blu-Ray can't pop a balloon... while I have a 50mW Blu-Ray that burns the wood on clothes pegs... @Meatball... I don't have any other ideas as of yet... Jerry

Ok... so about focus. We could incorporate a dot size I suppose..

Dang, this solution was supposed to be a simple one.

Now we have all these factors to incorporate in not just a procedure, but a formula. We need to find an equation that relates wavelength-distance-optical power-dot size-time- whats next? The humidity of the room?

__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")

06-15-2009, 08:19 PM #18
 Class 2M Laser Join Date: Nov 2008 Location: Lake Geneva, WI Posts: 863 Rep Power: 112
BrewCityMusic
Class 2M Laser

Join Date: Nov 2008
Location: Lake Geneva, WI
Posts: 863
Rep Power: 112

I'm sticking with "If you want to know the output of your lasers, buy an LPM", personally ... And yes, if you're measuring a DPSS laser, factors such as ambient temperature, etc definitely do come into play so the number of variables that would need to be overcome almost negates the entire concept of a "simple" test.
__________________
Been out of the "Laser Loop" for several years - WHY didn't anyone TELL me we now had Green and real BLUE diodes, especially measured in WATTS !?!?!?!

Starting over, still have my Kryton BDR Build at 401mW and one of the first Eghamus hosts with an O-like module that has faded from 151mW to about 45mW at TEM01 over the years, LOL - still have my LaserBee 1 though

06-16-2009, 12:33 AM #19
 Class 3B Laser Join Date: Feb 2008 Location: Lincoln, NE Posts: 2,989 Rep Power: 7447
Meatball
Class 3B Laser

Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 7447

Quote:
 Originally Posted by BrewCityMusic I'm sticking with "If you want to know the output of your lasers, buy an LPM", personally ... And yes, if you're measuring a DPSS laser, factors such as ambient temperature, etc definitely do come into play so the number of variables that would need to be overcome almost negates the entire concept of a "simple" test.

I'm not very interested in the power output of my lasers. It's just a theoretical light measurement that can't be directly applied to the laser's abilities. Like I said earlier, when someone says they have a 175mw green laser, that doesn't mean much to me since I don't know how much "work" it can apply to a target. I won't be able to compare it's abilities to somone's 200mw red. Anyone can say that their 200mw greenie is more powerful than a 200mw red, simply because we know that the green laser will have more energy density, more ability to "do work" on a target. What I'm looking to do, is somehow quantify a laser's ability to "do work". I want to know, just "how much" better, is that 200mw greenie over the red?

This isn't about power output just in case you misunderstood or something. LPMs are useless to me.

BTW, do you have that 8x Kryton up and going?
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")

06-16-2009, 01:37 AM #20
 Class 1M Laser Join Date: May 2009 Location: Southern Indiana Posts: 135 Rep Power: 11
sbdwag
Class 1M Laser

Join Date: May 2009
Location: Southern Indiana
Posts: 135
Rep Power: 11
Measuring energy

Seems to me that If you had a knows quality of opaque liquid in a say glass test tube you could measure a temperature change over a given period of time to determine the mw of light energy converted to heat. You would have to determine the amount of light energy reflected away as well as the ambient temperature inertia of the container along with the heat transfer properties of the liguid. If you could calibrate this you could determine very accurately from sample to sample

regards
sbdwag

06-16-2009, 02:16 AM #21
 Class 1M Laser Join Date: Jun 2009 Location: Ontario, Canada Posts: 165 Rep Power: 9
YGG
Class 1M Laser

Join Date: Jun 2009
Posts: 165
Rep Power: 9

There are just so many variables in each situation. It's going to be hard to make a proper formula, if you can do that properly.
__________________
Red 200mw 660nm HLP18130 Flashlight style
DX True 50mw 532nm Green Pen
MXDL PHR 405nm
250mw Pailide 6x thanks to DarkArmyofone and
Mohrenberg

Red from Dave 245mw
532nm Mini RPL SXD module 100mw
Another red in Mohrenberg's new host <250mw

06-16-2009, 02:24 AM #22
 Class 3B Laser Join Date: Jan 2009 Location: Spain, tarragona Posts: 3,635 Rep Power: 220
Hallucynogenyc
Class 3B Laser

Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 220

One moment. This will just give the burning power trough black electrical tape. Brown matches for example, are easier to burn with red than with bluray!
__________________
The difference between an ignorant and a wise is that the wise knows the limits of his knowledge while the ignorant ignores the limits of his ignorance.
Learn how to use Opera and tell me about your experience here!

Wicked Lasers Evolution Pro 130mW ------------------> Review
Rayfoss 150mW waterproof
Rayfoss 200mW focusable torch -----------------------> Review
Dealextreme 5mW true laser pointer
Dealextreme 50mW true laser pointer
Dealextreme 100mW true laser pointer
Laserlands 30mW disco laser --------------------------> Review
5mW pointers (many of them)
DX 200mW Red laser (Dilda) --------------------------> Review
120mW PHR custom build
200mW GGW custom build

Focalprice 7\$ green&bluray laser goggles
Dealextreme tripod and clamp for laser holding -----> Review
DIY 3 motor Spirograph --------------------------------> Review
HLPM-2 laser power meter

06-16-2009, 02:35 AM #23
 Class 4 Laser Join Date: Sep 2008 Location: Quebec, Canada Posts: 16,845 Rep Power: 1028649
lasersbee
Class 4 Laser

Join Date: Sep 2008
Posts: 16,845
Rep Power: 1028649

Quote:
 Originally Posted by sbdwag Seems to me that If you had a knows quality of opaque liquid in a say glass test tube you could measure a temperature change over a given period of time to determine the mw of light energy converted to heat. You would have to determine the amount of light energy reflected away as well as the ambient temperature inertia of the container along with the heat transfer properties of the liguid. If you could calibrate this you could determine very accurately from sample to sample regards sbdwag
That's what a thermal LPM does.... but a little faster...

What Meatball is looking for is a standard measuring stick to know which (let's say 200mW)
laser of different wavelengths burns a standard something (black tape) more aggressively...

Jerry
__________________

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions

This banner is available to and can be copied/used FREE by any LaserBee owner

Last edited by lasersbee; 06-16-2009 at 02:40 AM.

06-16-2009, 02:52 AM #24
 Class 3B Laser Join Date: Feb 2008 Location: Lincoln, NE Posts: 2,989 Rep Power: 7447
Meatball
Class 3B Laser

Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 7447

Quote:
 Originally Posted by Hallucynogenyc One moment. This will just give the burning power trough black electrical tape. Brown matches for example, are easier to burn with red than with bluray!
Thats why black tape should be used, since its will absorb a huge majority of all wavelengths of visible light. Forget this brown match poo. A brown match will reflect more light than black electrical tape. It would be best to use something that absorbs the energy of each laser wavelength.

Quote:
 Originally Posted by lasersbee That's what a thermal LPM does.... but a little faster... What Meatball is looking for is a standard measuring stick to know which (let's say 200mW) laser of different wavelengths burns a standard something (black tape) more aggressively... Jerry
Exactly!

Perhaps to measure how effectively a laser applies energy to a target, regardless of power output or wavelength. Guys wouldn't it be the ultimate to know not just the power of your own lasers, but to be able to measure and quantify their unique ability to burn? To compare each one of your own lasers regardless of color? Don't you want to know HOW much better one of your greens is, over your reds?
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")

06-16-2009, 02:55 AM #25
 Class 3B Laser Join Date: Jan 2009 Location: Spain, tarragona Posts: 3,635 Rep Power: 220
Hallucynogenyc
Class 3B Laser

Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 220

Quote:
 Originally Posted by Meatball Thats why black tape should be used, since its will absorb a huge majority of all wavelengths of visible light. Forget this brown match poo. A brown match will reflect more light than black electrical tape. It would be best to use something that absorbs the energy of each laser wavelength. Exactly! Perhaps to measure how effectively a laser applies energy to a target, regardless of power output or wavelength. Guys wouldn't it be the ultimate to know not just the power of your own lasers, but to be able to measure and quantify their unique ability to burn? To compare each one of your own lasers regardless of color? Don't you want to know HOW much better one of your greens is, over your reds?
The fact that you see it black means that it absorb all the visible wavelenghts. There could be 2 things that you see black one of them abosrbing UV and the other not.

Thats why you can't use this to test 405nm.
__________________
The difference between an ignorant and a wise is that the wise knows the limits of his knowledge while the ignorant ignores the limits of his ignorance.
Learn how to use Opera and tell me about your experience here!

Wicked Lasers Evolution Pro 130mW ------------------> Review
Rayfoss 150mW waterproof
Rayfoss 200mW focusable torch -----------------------> Review
Dealextreme 5mW true laser pointer
Dealextreme 50mW true laser pointer
Dealextreme 100mW true laser pointer
Laserlands 30mW disco laser --------------------------> Review
5mW pointers (many of them)
DX 200mW Red laser (Dilda) --------------------------> Review
120mW PHR custom build
200mW GGW custom build

Focalprice 7\$ green&bluray laser goggles
Dealextreme tripod and clamp for laser holding -----> Review
DIY 3 motor Spirograph --------------------------------> Review
HLPM-2 laser power meter

06-16-2009, 02:58 AM #26
 Class 3B Laser Join Date: Feb 2008 Location: Lincoln, NE Posts: 2,989 Rep Power: 7447
Meatball
Class 3B Laser

Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 7447

What? Black doesn't absorb 405nm? Why would the tape burn so easily then?
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")

06-16-2009, 03:59 AM #27
 Cereal Eater Join Date: Dec 2007 Location: Argentina Posts: 6,333 Rep Power: 9427
nikokapo
Cereal Eater

Join Date: Dec 2007
Location: Argentina
Posts: 6,333
Rep Power: 9427

I like this idea, it's not very specific but we could use it for quick comparisons. The thing is that we'll end up using the power as the main indicator so the math function would turn out to be useless.

06-16-2009, 04:14 AM #28
 Class 3B Laser Join Date: Jan 2009 Location: Spain, tarragona Posts: 3,635 Rep Power: 220
Hallucynogenyc
Class 3B Laser

Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 220

Quote:
 Originally Posted by Meatball What? Black doesn't absorb 405nm? Why would the tape burn so easily then?
I'm not saying black doesn't absorb UV, I'm saying that the fact that you see something black doesn't mean it abosrb UV.
__________________
The difference between an ignorant and a wise is that the wise knows the limits of his knowledge while the ignorant ignores the limits of his ignorance.
Learn how to use Opera and tell me about your experience here!

Wicked Lasers Evolution Pro 130mW ------------------> Review
Rayfoss 150mW waterproof
Rayfoss 200mW focusable torch -----------------------> Review
Dealextreme 5mW true laser pointer
Dealextreme 50mW true laser pointer
Dealextreme 100mW true laser pointer
Laserlands 30mW disco laser --------------------------> Review
5mW pointers (many of them)
DX 200mW Red laser (Dilda) --------------------------> Review
120mW PHR custom build
200mW GGW custom build

Focalprice 7\$ green&bluray laser goggles
Dealextreme tripod and clamp for laser holding -----> Review
DIY 3 motor Spirograph --------------------------------> Review
HLPM-2 laser power meter

06-16-2009, 04:19 AM #29
 Class 4 Laser Join Date: Sep 2008 Location: Quebec, Canada Posts: 16,845 Rep Power: 1028649
lasersbee
Class 4 Laser

Join Date: Sep 2008
Posts: 16,845
Rep Power: 1028649

A good flat Black surface also absorbs invisible wavelengths...

Jerry
__________________

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions

This banner is available to and can be copied/used FREE by any LaserBee owner

06-16-2009, 04:22 AM #30
 Class 3B Laser Join Date: Feb 2008 Location: Lincoln, NE Posts: 2,989 Rep Power: 7447
Meatball
Class 3B Laser

Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 7447

Yes I could agree to the same thing, simply because 405nm burns electrical tape so well. I think its safe to say that it is mostly absorbed.
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")

06-16-2009, 04:22 AM #31
 Class 3B Laser Join Date: Jan 2009 Location: Spain, tarragona Posts: 3,635 Rep Power: 220
Hallucynogenyc
Class 3B Laser

Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 220

and how can you difference those than the black which doesn't? Again, this is only going to give you an idea on how fast does a laser cut electrical tape.

Brown matches for example, cannot be ignited with bluray but easy with red.
__________________
The difference between an ignorant and a wise is that the wise knows the limits of his knowledge while the ignorant ignores the limits of his ignorance.
Learn how to use Opera and tell me about your experience here!

Wicked Lasers Evolution Pro 130mW ------------------> Review
Rayfoss 150mW waterproof
Rayfoss 200mW focusable torch -----------------------> Review
Dealextreme 5mW true laser pointer
Dealextreme 50mW true laser pointer
Dealextreme 100mW true laser pointer
Laserlands 30mW disco laser --------------------------> Review
5mW pointers (many of them)
DX 200mW Red laser (Dilda) --------------------------> Review
120mW PHR custom build
200mW GGW custom build

Focalprice 7\$ green&bluray laser goggles
Dealextreme tripod and clamp for laser holding -----> Review
DIY 3 motor Spirograph --------------------------------> Review
HLPM-2 laser power meter

06-16-2009, 04:29 AM #32
 Class 3B Laser Join Date: Feb 2008 Location: Lincoln, NE Posts: 2,989 Rep Power: 7447
Meatball
Class 3B Laser

Join Date: Feb 2008
Location: Lincoln, NE
Posts: 2,989
Rep Power: 7447

Quote:
 Originally Posted by Hallucynogenyc and how can you difference those than the black which doesn't? Again, this is only going to give you an idea on how fast does a laser cut electrical tape. Brown matches for example, cannot be ignited with bluray but easy with red.
Thats why we would use black electrical tape. Its black because it is awesome at absorbing the light we see. We CAN see 405nm light. When that energy is absorbed, it is converted into heat, which does work on the chemical bonds holding that tape together.

Brown matches don't work well simply cause they apparently don't absorb enough 405nm for enough work to be done from the energy applied.

It think its apparent enough, that 405nm light is absorbed just like red light and all the wavelengths in between.
__________________
FIAT LUX

(\__/)
(='.'=)
(")_(")

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 09:05 PM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointers - Archive - Top