Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Experiments & Modifications



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 08-06-2008, 01:20 PM #1
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Mikos Mikos is offline
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Default Which thermopile (TEC) is better for power meter?

I want to improve my idea on laser power meter. My first idea has been thermistor in combination with power resistor (see my previous topic). It works, but thermistor has pretty slow reaction time (it takes more than minute to stabilise) and also is too small (I didn't find any big thermistors).

I would like to use thermopile (TEC, also known as Peltier coolers) instead of thermistor. I have found that professional calorimeter-based laser power meters also use thermopiles as sensors. TEC should have much better reaction time than thermistor and dependence between heat input power and output current should be linear. TEC should have also much better accuracy. I can use power resistor (with potentiometer for power regulation and multimeter for measurements) as heat source to determine multiplication factor and calibrate it.

There is great guide for DIY thermopile-based laser power sensor here on Photonlexicon forums:
Part 2 - Laser Power Meters

I know I would still need another calibrated laser power meter (or laser sources with known output power) to determine correction factor (because of imperfect absorption of laser light), but with proper coating (activated charcoal powder and/or lamp black) error wouldn't be that bad even without it, calibration by power resistor should be enough (at least for my needs).

What I need to know now is which TEC is best for my needs. I have access to these TECs (you can also look at datasheet):

TEC1-01708: Size 15x15x3.3mm (WxDxH), Imax 8,5A, Umax 2,06V, Qmax 9,2W, couples = 17
TEC1-07103: Size 30x30x4.9mm (WxDxH), Imax 3.3A, Umax 8.1V, Qmax 16,4W, R = 1.80 ohm, couples = 71
TES1-12704: Size 30x30x3.2mm (WxDxH), Imax 3,9A, Umax 15.4V, Qmax 33,4W, couples = *127
TEC1-07108: Size 30x30x3.8mm (WxDxH), Imax 8.5A, Umax 8.6V, Qmax 38,5W, R = 0.85 ohm, couples = 71
TEC1-03114: Size 30x30x4.6mm (WxDxH), Imax 14A, Umax 3.75V, Qmax 29,2W, couples = 31

I assume that smaller area is better (because of thermal isolation), am I right? But also number of thermocouples per area is really important (for better accuracy). So I am deciding between TEC1-01708 (15x15 mm, but only 17 thermocouples) and TES1-12704 (30x30 mm and 127 thermocouples). Also I don't know if lower voltage (but higher current) models or higher voltage (but lower current) models are better. I will be measuring current, so I assume that higher current models are better, or is it irrelevant?


Mikos is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 08-06-2008, 09:23 PM #2
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Which thermopile (TEC) is better for power met

From what I've seen of the LaserBee module, their TEC is a tiny, maybe 1cm x 1cm TEC (maybe even half that size). I don't know if this was to keep costs down, or that it helped with the thermo characteristics of the device, but the ones listed above are pretty big, especially the 3x3 cm^2 ones. They also appear to be teflon coated, which may hinder conductivity. For example, here is the large one with 127 couples on it.

On another note, does anyone know how much heating is produced, or rather the temperature changes (in K or C), by a 5mW difference on a well-absorbing black surface? I was wondering what kind of sensitivity these devices need to have.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is online now   Reply With Quote
Old 08-06-2008, 11:39 PM #3
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Mikos Mikos is offline
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by Bionic-Badger
On another note, does anyone know how much heating is produced, or rather the temperature changes (in K or C), by a 5mW difference on a well-absorbing black surface? *I was wondering what kind of sensitivity these devices need to have.
It depends on specific heat capacity and mass of the target. These TECs are extremely sensitive. It even register heat from your body if you put palm of your hand near them.
Mikos is offline   Reply With Quote
Old 08-08-2008, 10:58 AM #4
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Which thermopile (TEC) is better for power met

Well I just bought some cheap-ass small peltiers off ebay, so I'll see what kind of response these things have to lasers. If it sucks I can use it to cool down a laser or something.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is online now   Reply With Quote
Old 08-08-2008, 05:24 PM #5
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Mikos Mikos is offline
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by Bionic-Badger
Well I just bought some cheap-ass small peltiers off ebay, so I'll see what kind of response these things have to lasers. *If it sucks I can use it to cool down a laser or something.
Great! ;-) I am going to buy TEC and electronic parts for thermopile amplifier next week.

Just remember that you must attach other side of peltier to some big heatsink (to get accurate readings). Also you must paint it black with active carbon powder or lamp black (you want as great absorption in visible spectrum as possible, it must be definitely matte, not glossy).

Response will be IMHO in range of microvolts, so standard multimeter isn't enough for measurement, you must build operation amplifier (here is good one). Or you can try to measure current (in range of hundreds to thousands microamps), but I am afraid it will be less accurate.
Mikos is offline   Reply With Quote
Old 08-08-2008, 07:20 PM #6
MarioMaster's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Allentown, PA
Posts: 3,621
Rep Power: 346
MarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond repute
Send a message via AIM to MarioMaster
MarioMaster MarioMaster is offline
Class 3B Laser
MarioMaster's Avatar
 
Join Date: Jul 2007
Location: Allentown, PA
Posts: 3,621
Rep Power: 346
MarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond repute
Send a message via AIM to MarioMaster
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by Mikos
[quote author=Bionic-Badger link=1218028835/0#3 date=1218193134]Well I just bought some cheap-ass small peltiers off ebay, so I'll see what kind of response these things have to lasers. If it sucks I can use it to cool down a laser or something.
Great! ;-) I am going to buy TEC and electronic parts for thermopile amplifier next week.

Just remember that you must attach other side of peltier to some big heatsink (to get accurate readings). Also you must paint it black with active carbon powder or lamp black (you want as great absorption in visible spectrum as possible, it must be definitely matte, not glossy).

Response will be IMHO in range of microvolts, so standard multimeter isn't enough for measurement, you must build operation amplifier (here is good one). Or you can try to measure current (in range of hundreds to thousands microamps), but I am afraid it will be less accurate.[/quote]

you may also want to get a small piece of aluminum or copper to mount to the face of the TEC to ensure the heat is spread evenly across all the junctions - if you only heat the central junctions for example your reading may be inaccurate as the non heated junctions will reduce the output
__________________
ILT 5500KR krypton only air cooled ion 100mW 647.1nm | ILT 5500AR argon only air cooled ion >300mW multiline
Omnichrome 643 air cooled Ar/Kr ion 10mW 676.4nm 647.1nm 568.2nm 488nm 476.2nm (high hours)
Spectra Physics 127 >30mW 632.8nm HeNe | Uniphase 1.5mW 543.5nm GreeNe
Coherent Innova 90 argon ion water cooled ??W (got plasma, alignment in progress)
Coherent 60W 830nm water cooled diode brick | Shenhui Laser 40W 10600nm water cooled CO2

(9:03:50 PM) Picasso: the best guys i saw ever at burning man was two dudes dressed as all green army men shooting pants at naked guys
MarioMaster is offline   Reply With Quote
Old 08-09-2008, 02:43 AM #7
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Which thermopile (TEC) is better for power met

Yup, I have nearly all the parts I need to experiment with. Heatsinks from computers, flat black paint, ADCs, op-amps, and all that good stuff. I've also got some other stuff on the way to see how they perform. If there are some usable results, I may be forced to buy a reference meter to calibrate with. Won't that *cough* be a sad day...
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is online now   Reply With Quote
Old 08-09-2008, 09:46 AM #8
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Mikos Mikos is offline
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by MarioMaster
you may also want to get a small piece of aluminum or copper to *mount to the face of the TEC to ensure the heat is spread evenly across all the junctions - if you only heat the central junctions for example your reading may be inaccurate as the non heated junctions will reduce the output
This would IMHO get you worse results than without it (especially worse reaction time). Thermopiles should have same output independent from which thermocouple in thermopile is heated (if you aim laser on center or on the edge, output should be same). Absorber should be as thin as possible for measuring power (and there is already thin ceramic plate on TEC). Volume absorbers are used only for measurement of laser pulse energy, not average power of CW laser.

Black paint with high concentration of activated carbon powder or lamp black should be IMHO enough...

Btw. there is great description of laser calorimeters from Scientech:
Measuring Laser Output
Mikos is offline   Reply With Quote
Old 08-09-2008, 10:04 AM #9
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Mikos Mikos is offline
Junior Member
 
Join Date: Jul 2008
Posts: 19
Rep Power: 0
Mikos is on a distinguished road
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by Bionic-Badger
..., flat black paint, ...
It should be carbon-based paint (with high concentration of carbon particles). Maybe it would be better if you make it yourself from activated charcoal powder. There are great instructions:
http://www.photonlexicon.com/forums/...p;postcount=12
Mikos is offline   Reply With Quote
Old 08-09-2008, 10:38 AM #10
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 2192
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Which thermopile (TEC) is better for power met

Hmm, I'll have to check that out. Actually, since this is mostly for experimentation, and I'm receiving three of the same peltier type, I can try out the various paints, etc. to see how they perform. This paint has a high emissivity at around 0.97 though it was measured in the infrared region. I'll have to see how it performs as a broadband absorber.

For that carbon deposition I should try picking up a chemical vibrator thing at my university if they still have them to deposit it evenly. Never thought about ever needing one before though. Sounds like a fun project regardless.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is online now   Reply With Quote
Old 08-10-2008, 04:18 AM #11
MarioMaster's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Allentown, PA
Posts: 3,621
Rep Power: 346
MarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond repute
Send a message via AIM to MarioMaster
MarioMaster MarioMaster is offline
Class 3B Laser
MarioMaster's Avatar
 
Join Date: Jul 2007
Location: Allentown, PA
Posts: 3,621
Rep Power: 346
MarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond reputeMarioMaster has a reputation beyond repute
Send a message via AIM to MarioMaster
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by Mikos
[quote author=MarioMaster link=1218028835/0#5 date=1218223252]you may also want to get a small piece of aluminum or copper to mount to the face of the TEC to ensure the heat is spread evenly across all the junctions - if you only heat the central junctions for example your reading may be inaccurate as the non heated junctions will reduce the output
This would IMHO get you worse results than without it (especially worse reaction time). Thermopiles should have same output independent from which thermocouple in thermopile is heated (if you aim laser on center or on the edge, output should be same). Absorber should be as thin as possible for measuring power (and there is already thin ceramic plate on TEC). Volume absorbers are used only for measurement of laser pulse energy, not average power of CW laser.

Black paint with high concentration of activated carbon powder or lamp black should be IMHO enough...

Btw. there is great description of laser calorimeters from Scientech:
Measuring Laser Output[/quote]

also keep in mind that TECs are NOT thermopiles, ceramic is not great at conducting heat - it it just used because it doesn't conduct electricity otherwise the whole junction would short, the piece of metal i was suggesting was to ensure all the peltier junctions in the TEC are evenly heated so the measurement stays accurate
__________________
ILT 5500KR krypton only air cooled ion 100mW 647.1nm | ILT 5500AR argon only air cooled ion >300mW multiline
Omnichrome 643 air cooled Ar/Kr ion 10mW 676.4nm 647.1nm 568.2nm 488nm 476.2nm (high hours)
Spectra Physics 127 >30mW 632.8nm HeNe | Uniphase 1.5mW 543.5nm GreeNe
Coherent Innova 90 argon ion water cooled ??W (got plasma, alignment in progress)
Coherent 60W 830nm water cooled diode brick | Shenhui Laser 40W 10600nm water cooled CO2

(9:03:50 PM) Picasso: the best guys i saw ever at burning man was two dudes dressed as all green army men shooting pants at naked guys
MarioMaster is offline   Reply With Quote
Old 08-10-2008, 06:06 AM #12
Kenom's Avatar
Class 4 Laser
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Kenom Kenom is offline
Class 4 Laser
Kenom's Avatar
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Default Re: Which thermopile (TEC) is better for power met

Quote:
Originally Posted by MarioMaster
[quote author=Mikos link=1218028835/0#7 date=1218275181][quote author=MarioMaster link=1218028835/0#5 date=1218223252]you may also want to get a small piece of aluminum or copper to *mount to the face of the TEC to ensure the heat is spread evenly across all the junctions - if you only heat the central junctions for example your reading may be inaccurate as the non heated junctions will reduce the output
This would IMHO get you worse results than without it (especially worse reaction time). Thermopiles should have same output independent from which thermocouple in thermopile is heated (if you aim laser on center or on the edge, output should be same). Absorber should be as thin as possible for measuring power (and there is already thin ceramic plate on TEC). Volume absorbers are used only for measurement of laser pulse energy, not average power of CW laser.

Black paint with high concentration of activated carbon powder or lamp black should be IMHO enough...

Btw. there is great description of laser calorimeters from Scientech:
Measuring Laser Output[/quote]

also keep in mind that TECs are NOT thermopiles, ceramic is not great at conducting heat - it it just used because it doesn't conduct electricity otherwise the whole junction would short, the piece of metal i was suggesting was to ensure all the peltier junctions in the TEC are evenly heated so the measurement stays accurate[/quote]

This is exactly the reason for using a SMALL peltier.
Kenom is offline   Reply With Quote
Reply





Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f42/thermopile-tec-better-power-meter-26643.html
Posted By For Type Date
Le site de Bidule&Omega;hm This thread Refback 07-26-2013 08:34 AM










Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 12:10 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC