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06-06-2015, 08:15 AM #33
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Re: WTB LPM + Thank you Alaskan

More power! Need to get you hooked on higher power lasers and you won't need a fog machine, but I do agree, if you are going to stay at such low power, a fog machine will make them appear to be much higher power

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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

06-06-2015, 08:21 AM #34
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Hap
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Re: WTB LPM + Thank you Alaskan

Quote:
 Originally Posted by Alaskan More power! Need to get you hooked on higher power lasers and you won't need a fog machine, but I do agree, if you are going to stay at such low power, a fog machine will make them appear to be much higher power
Exactly haha.

This hobby is crazy though, I've probably spent over \$1000 in the 1 & 1/2 years I've been here. Wow

-Alex
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635nm: Laserglow Libra 5mW *North Pole Edition*

"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
"The stars should fall and the earth be riddled, imagine all your problems be seem so little, funny how the world so brittle." -Tribal Seeds
“The universe is a pretty big place. If it's just us, seems like an awful waste of space.” -Carl Sagan
You are important: Pale Blue Dot

06-06-2015, 08:31 AM #35
 Class 3R Laser Join Date: Feb 2014 Location: Moses Lake Posts: 1,455 Rep Power: 774423
vortish
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Re: WTB LPM + Thank you Alaskan

Alex I have a two bottles of lab grade glycerin that if you want one all you have to do is pay shipping and you can make about a gallon of juice for around 12 bucks to ship it to you
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532 nm 5 mw ebay pen
532 nm 30 mw guess 301 ebay laser \$ 10
532 nm 20-40 mw gift \$ 10
532 nm 80 mw Pman Specail \$ 25-30
532 nm 80 mw \$ 25-30
532 nm 40-60 mw star cap Alaskan laser
532 nm 200 mw
532 nm ? mw GearBest Laser \$ 15
532 nm 60 mw pen

632.8 nm .5 mw Uniphase 1508 Helium Neon Gas Laser
632.8 nm 1.3 mw Uniphase 098-0 \$ 150 Heliun Neon Tube
650nm 5 mw ebay pen
650 nm 123 mw Pman Pen

405 nm 5 mw ebay pen
405 nm 95 mw pocket burner
405 nm 70 mw star cap pointer

445 nm 1.6 watt custom needs fixing \$ 50 501b

06-06-2015, 08:31 AM #36
 Super Moderator Join Date: Jan 2014 Location: Qatar, land of the hot footed. Posts: 9,638 Rep Power: 1976820
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Re: WTB LPM + Thank you Alaskan

Ha, I've spent 30K on laser stuff in 2 years.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

06-06-2015, 09:51 AM #37
 Super Moderator Join Date: Sep 2013 Location: Morro Bay, CA, USA Posts: 8,223 Rep Power: 1717481
Hap
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Re: WTB LPM + Thank you Alaskan

Quote:
 Originally Posted by Alaskan Ha, I've spent 30K on laser stuff in 2 years.
Wow haha.

Also, yeah im not imagining things. I ran my 532 & 520 tonight & the 520 clearly has power issues. It's bright for a couple minutes then dims down to barely noticeable(and this is with the 3.7 cells). Common CNI....

Should I just contact CNI & ask for a new unit? I could try and send it to a member after all. *sigh*

-Alex
__________________
635nm: Laserglow Libra 5mW *North Pole Edition*

"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
"The stars should fall and the earth be riddled, imagine all your problems be seem so little, funny how the world so brittle." -Tribal Seeds
“The universe is a pretty big place. If it's just us, seems like an awful waste of space.” -Carl Sagan
You are important: Pale Blue Dot

06-06-2015, 09:54 AM #38
 Class 3B Laser Join Date: May 2013 Location: Snohomish County Washington, US Posts: 3,798 Rep Power: 102502
Pi R Squared
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Re: WTB LPM + Thank you Alaskan

I know I've seen an LPM for sale that was for low power, I think only up to 5 mW but I don't remember the brand or where, it's not something that would interest me. Most of our hobbiest grade LPMs drop off in accuracy at 20mW or less, at least I read that before here somewhere.

I don't know what kind is better at lower powers but you must be careful how you do it. Be sure there are no open windows, no fan, heater, AC, or ventilation running, the air in the room should be still, no heat source of any kind near the LPM. Do not hold the laser in your hand, even your hand can measure a mW or two, anyway the laser must be still and not moving, so put it in a tripod and point it at the sensor from 4 to 8 inches away, wait for the LPMs response time or up to a minute for an accurate reading. This can be a problem getting an accurate reading with high power lasers if they have a short duty cycle. All of you with an LPM already know this, I am just saying this for anyone who never used one. When measuring a class 4 laser being off by several mW may be unimportant, but at low power it becomes important.

Alan
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Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter

___________________________________________
The light that shines twice as bright burns half as long.

06-06-2015, 09:56 AM #39
 Class 3R Laser Join Date: Nov 2014 Location: Netherlands Posts: 1,094 Rep Power: 1389
gozert
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Re: WTB LPM + Thank you Alaskan

Return it to CNI and ask for a new one. Sending it to a member will most likely void warranty and it might not be easy to fix. This is the reason I try building most of my lasers myself nowadays. I don't have to rely on a company that may not test it's lasers well before shipping them, and I hate paying return shipping to China as it's way too expensive.
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New here? Check this out: All in one thread for beginning hobbyists

06-06-2015, 10:22 AM #40
 Super Moderator Join Date: Sep 2013 Location: Morro Bay, CA, USA Posts: 8,223 Rep Power: 1717481
Hap
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Quote:
 Originally Posted by gozert Return it to CNI and ask for a new one. Sending it to a member will most likely void warranty and it might not be easy to fix. This is the reason I try building most of my lasers myself nowadays. I don't have to rely on a company that may not test it's lasers well before shipping them, and I hate paying return shipping to China as it's way too expensive.
Alright I'll try that & ask that CNI pay for return shipping. What is complicated is creating a label with FedEx. They ask so much information for customs like a signature of the company etc...I might need to driver over there so they can help me out.

PS: What is strange is CNI told me to turn off the laser after 1-2 minutes since that's it's duty cycle. Should 4mW of 520 really have a duty cycle?

-Alex

Last edited by Hap; 06-06-2015 at 10:25 AM.

06-06-2015, 10:50 AM #41
 Class 3R Laser Join Date: Nov 2014 Location: Netherlands Posts: 1,094 Rep Power: 1389
gozert
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Re: WTB LPM + Thank you Alaskan

I doubt a diode running at such low power has a duty cycle at all and I doubt the driver is getting hot either. Especially since you have a 532nm too which you can run for long times without turning off, and those tend to produce more heat due to their pump diode.

I can imagine them charging you shipping costs both ways and say there is nothing wrong with it because it stays stable for the 2 minutes.
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New here? Check this out: All in one thread for beginning hobbyists

06-06-2015, 10:58 AM #42
 Class 3B Laser Join Date: May 2013 Location: Snohomish County Washington, US Posts: 3,798 Rep Power: 102502
Pi R Squared
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Re: WTB LPM + Thank you Alaskan

Quote:
 Originally Posted by gozert Return it to CNI and ask for a new one. Sending it to a member will most likely void warranty and it might not be easy to fix. This is the reason I try building most of my lasers myself nowadays. I don't have to rely on a company that may not test it's lasers well before shipping them, and I hate paying return shipping to China as it's way too expensive.
That's right, building your own is the way to go. Except for my 3 pen type lasers I built the others. I know they are high quality and exactly what's in them, if one ever breaks I will know how to take it apart and figure out what's wrong and fix it. Some of the parts are made in the US, the power is stable, and the beam is straight. They also don't have to be the higher power lasers many of us build, I have seen some sources of low power LDs even <5mW and you can build these yourself too.

In China, most factory workers are very low paid and have to work very fast and there's little or no quality control. When you buy a laser made in China you are gambling. No one has to buy lasers made in China. We have members here in several countries (Israel, Norway, Belgium, US) that build and sell lasers or a parts bundle you can assemble yourself. There are members here who make hosts, heat sinks, and focus knobs (in U.A.E., Croatia, US), many drivers and battery contact boards are made in the US and G2 lenses are made in the US.

Alan
__________________
Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter

___________________________________________
The light that shines twice as bright burns half as long.

06-06-2015, 11:13 AM #43
 Class 3R Laser Join Date: Nov 2014 Location: Netherlands Posts: 1,094 Rep Power: 1389
gozert
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Re: WTB LPM + Thank you Alaskan

Quote:
 Originally Posted by Pi R Squared and the beam is straight.

Just this makes me build my lasers myself except for exotic DPSS. I absolutely hate angled beams.
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Last edited by gozert; 06-06-2015 at 01:24 PM.

06-06-2015, 11:38 AM #44
 Class 3B Laser Join Date: May 2013 Location: Snohomish County Washington, US Posts: 3,798 Rep Power: 102502
Pi R Squared
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Re: WTB LPM + Thank you Alaskan

Quote:
 Originally Posted by gozert Just this makes me build my lasers myself except for exotic DPSS. I absolutely hate angled beams.
HAHA I know what you mean, someone here recently in another thread said that they have never seen a straight beam. I can't understand any excuse for such poor craftsmanship.

Alex, the 520nm diodes are less efficient than others and do produce more heat, it is quite possible it really does have a duty cycle of 2 minutes. It is normal for it to start dropping in power as you exceed the duty cycle, it happens on my 520nm, I can see it if I measure it on the LPM, it is common to all solid state/diode lasers, there may be some that low power with no duty cycle but probably not a 520nm.

Alan
__________________
Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter

___________________________________________
The light that shines twice as bright burns half as long.

06-06-2015, 04:27 PM #45
 Super Moderator Join Date: Jan 2014 Location: Qatar, land of the hot footed. Posts: 9,638 Rep Power: 1976820
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Re: WTB LPM + Thank you Alaskan

I have a LaserBee A and although it isn't rated to measure down to a few milliwatts, I've been able to use it that low if I do everything Pi warned about, there cannot be much movement of air in the room, even breathing near the sensor head can change the power reading, or holding your hand close to the meter so keeping the laser pointer 8 inches away or more is a good idea too.

With my LaserBee, I first place the sensor on a small piece of folded paper towel to minimize the transfer of heat from its aluminum body to anything else and after touching it, let it sit for a couple of minutes so the heat from my hand drains off into the air. After the meter has stabilized, then I use the knob to zero the meter, or show all zeros but to do so takes some time; my meter seems to be reading a bit low, so I turn the knob until I see 0001, then back it off by turning the knob very slowly until I see 0000, turn it back up in tiny increments until I see 0001 again and then leave it there. Next I put the beam from the pointer on the sensor for at least 30 seconds to get a peak reading. The laser really needs to be completely still, holding it in your hand will cause differences in reading. Even with all of this the meter can be off from a half to a full milliwatt. I suppose that isn't so bad for a cheap laser power meter and doing so allows measurements far lower power than it is rated for.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37

Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

06-06-2015, 06:51 PM #46
 Super Moderator Join Date: Sep 2013 Location: Morro Bay, CA, USA Posts: 8,223 Rep Power: 1717481
Hap
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Re: WTB LPM + Thank you Alaskan

Quote:
 Originally Posted by Pi R Squared HAHA I know what you mean, someone here recently in another thread said that they have never seen a straight beam. I can't understand any excuse for such poor craftsmanship. Alex, the 520nm diodes are less efficient than others and do produce more heat, it is quite possible it really does have a duty cycle of 2 minutes. It is normal for it to start dropping in power as you exceed the duty cycle, it happens on my 520nm, I can see it if I measure it on the LPM, it is common to all solid state/diode lasers, there may be some that low power with no duty cycle but probably not a 520nm. Alan
Interesting. Alright, I'll take another shot at running it tonight & measure how long it takes before I see the drop in brightness and will report back!

-Alex
__________________
635nm: Laserglow Libra 5mW *North Pole Edition*

"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
"The stars should fall and the earth be riddled, imagine all your problems be seem so little, funny how the world so brittle." -Tribal Seeds
“The universe is a pretty big place. If it's just us, seems like an awful waste of space.” -Carl Sagan
You are important: Pale Blue Dot

06-06-2015, 11:03 PM #47
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GR3EN
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Re: WTB LPM + Thank you Alaskan

Pm sent. A lasercheck just popped up on eBay.
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Omni/Melles Griot 543 Argon
3.4mw 635nm (LG Libra)
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LPMs:

Coherent Lasercheck

06-06-2015, 11:22 PM #48
 Super Moderator Join Date: Sep 2013 Location: Morro Bay, CA, USA Posts: 8,223 Rep Power: 1717481
Hap
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Quote:
 Originally Posted by GR3EN Pm sent. A lasercheck just popped up on eBay.
Thanks for looking out GR3EN! I decided in the end to go with a fog machine, and pass up on a LPM for now

-Alex

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