Old 02-01-2017, 05:55 PM #17
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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Originally Posted by CynicalBrad View Post
Lol. Or have a few set up in a way that triggering one causes another mounted on a servo to wiggle and lead to the next. Cat crosses beam, wiggly laser turns on, stuff ensues, entertained cat :P
LOL when I imagine a cute cat entertained and confused meanwhile playing with that!


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Old 03-02-2017, 08:13 PM #18
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

I see that you are an EE student, well then i'm sure you can build a TEC based LPM easily

you could build a high powered LPM for only a few $$$
arduino based or something that can read the voltage and display it on PC or LCD
don't worry with the calibration though, there is many ways to calibrate your sensor
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Laser Power Meter:
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-LaserBee II OEM

Reference Sensor:
-Ophir L30A-19mm-BNC
-Ophir 150C-A-.2-FLASH
-Ophir 150C-A-.1-AX
-Ophir 20C-A-1-Y
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Old 03-03-2017, 07:14 AM #19
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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Originally Posted by astralist View Post
I see that you are an EE student, well then i'm sure you can build a TEC based LPM easily

you could build a high powered LPM for only a few $$$
arduino based or something that can read the voltage and display it on PC or LCD
don't worry with the calibration though, there is many ways to calibrate your sensor
Thanks! However I'm a freshman so I don't know what "TEC" is?
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Old 03-03-2017, 07:26 AM #20
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

TEC stands for Thermoelectric cooler. They transfer heat from one side to another using the peltier effect. Depending on polarity, they can be used to heat up or cool down an object.
They are used in refrigerators.
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Old 03-03-2017, 07:53 AM #21
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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Originally Posted by CurtisOliver View Post
TEC stands for Thermoelectric cooler. They transfer heat from one side to another using the peltier effect. Depending on polarity, they can be used to heat up or cool down an object.
They are used in refrigerators.
Thank you
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Old 03-03-2017, 07:59 AM #22
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

You're welcome.
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Old 03-03-2017, 09:15 AM #23
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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Originally Posted by Sepehr View Post
Thanks! However I'm a freshman so I don't know what "TEC" is?
TEC, or peltier, just like CurtisOliver said, it can be used to pump heat from one side to another.

And i might want to add something:
if one side of TEC/peltier fixed/glued (using thermal glue of course) then the other side can be used as a temperature sensor, thus it can be used as laser power meter.

long story short, if TEC supplied by voltage, it will pum heat from one side to another, producing one hot surface and one cold surface, on the other hand, if you exposed one side of the TEC to a heat source e.g laser, it will produce a small amount of voltage (Seebeck effect).
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-808nm: ~600mW (~700mW pk) - Rayfoss
-650nm: ~250mW (~190mW pk) - O-like + G2 lens
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-532nm: ~800mW (968mW pk) - Jetlasers
-465nm: ~5000mW (~5500mW pk) - Custom Self Designed Host + NUBM07E Diode + G2 Lens
-447nm: ~3500mW (~3700mW pk) - Cypreus IIIb Host + 9mm 450nm Diode + G2 Lens
-447nm: ~1400mW (~1500mW pk) - Dragonlasers Host + M140 Diode + 3 Elements Lens
-405nm: ~500mW (~700mW pk) - Sanwu Challenger + G2 Lens

Laser Power Meter:
-Hyperion Aurum
-Hyperion Argentum
-Hyperion Cuprum
-LaserBee II OEM

Reference Sensor:
-Ophir L30A-19mm-BNC
-Ophir 150C-A-.2-FLASH
-Ophir 150C-A-.1-AX
-Ophir 20C-A-1-Y
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Old 03-03-2017, 09:19 AM #24
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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Originally Posted by astralist View Post
TEC, or peltier, just like CurtisOliver said, it can be used to pump heat from one side to another.

And i might want to add something:
if one side of TEC/peltier fixed/glued (using thermal glue of course) then the other side can be used as a temperature sensor, thus it can be used as laser power meter.

long story short, if TEC supplied by voltage, it will pum heat from one side to another, producing one hot surface and one cold surface, on the other hand, if you exposed one side of the TEC to a heat source e.g laser, it will produce a small amount of voltage (Seebeck effect).
Precisely Astralist. Just need to calibrate it to work out how much power your laser is emitting using a already tested source.

POSSIBLE (just possible) "cheap LPM" using small TEC's (first experiments)

Edit: Just added an old thread from 2009.

Last edited by CurtisOliver; 03-03-2017 at 09:24 AM.
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Old 03-03-2017, 09:28 AM #25
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

Quote:
Originally Posted by astralist View Post
TEC, or peltier, just like CurtisOliver said, it can be used to pump heat from one side to another.

And i might want to add something:
if one side of TEC/peltier fixed/glued (using thermal glue of course) then the other side can be used as a temperature sensor, thus it can be used as laser power meter.

long story short, if TEC supplied by voltage, it will pum heat from one side to another, producing one hot surface and one cold surface, on the other hand, if you exposed one side of the TEC to a heat source e.g laser, it will produce a small amount of voltage (Seebeck effect).
What about low-powered lasers with no sensible heat?
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Old 03-03-2017, 09:34 AM #26
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

Ah, not good I forgot that yours are low powered. This method won't allow the measurement of lasers as low as 5mW unfortunately. Even a well built hobbyist lpm listed above won't read lasers accurately below 15mW.
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Old 03-03-2017, 09:39 AM #27
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

No problem. Very interesting project. Thank you guys for introducing it.
I'll definitely try to build one as soon as I'd have time for it.
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Old 03-03-2017, 01:52 PM #28
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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What about low-powered lasers with no sensible heat?
It depends, with right type of TEC, signal processing, and good environment, you can read down to sub miliwatt.
TEC with many PN junction (or small box if you see it from the side) has a higher output voltage per units of heat.

Just for example, i have these peltier which outputs about 300mV per watt laser (when coated with black matte surface).
I also have this one with fewer PN junction which outputs about 170mW per watt laser.

If you want to measure tiny powered laser, you should choose the one with higher output, and you might need to amplify it using high precision zero drift chopper amplifier
only then you can easily read the voltage using ADC from the microcontroller like arduino, etc.
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-532nm: ~800mW (968mW pk) - Jetlasers
-465nm: ~5000mW (~5500mW pk) - Custom Self Designed Host + NUBM07E Diode + G2 Lens
-447nm: ~3500mW (~3700mW pk) - Cypreus IIIb Host + 9mm 450nm Diode + G2 Lens
-447nm: ~1400mW (~1500mW pk) - Dragonlasers Host + M140 Diode + 3 Elements Lens
-405nm: ~500mW (~700mW pk) - Sanwu Challenger + G2 Lens

Laser Power Meter:
-Hyperion Aurum
-Hyperion Argentum
-Hyperion Cuprum
-LaserBee II OEM

Reference Sensor:
-Ophir L30A-19mm-BNC
-Ophir 150C-A-.2-FLASH
-Ophir 150C-A-.1-AX
-Ophir 20C-A-1-Y
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Old 03-03-2017, 04:13 PM #29
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

Could a hobbyist put together one that sensitive? If so, that would be super impressive.
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Old 03-03-2017, 05:02 PM #30
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

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Originally Posted by CurtisOliver View Post
Could a hobbyist put together one that sensitive? If so, that would be super impressive.
My Hyperion LPMs are able to read down to 1 microwatt
the 22-bit ADC and signal processing allows it to happen

still, when in doubt, i can always ignore something below 1mW
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-808nm: ~600mW (~700mW pk) - Rayfoss
-650nm: ~250mW (~190mW pk) - O-like + G2 lens
-635nm: ~200mW (~400mW pk) - Lasetbtb
-532nm: ~800mW (968mW pk) - Jetlasers
-465nm: ~5000mW (~5500mW pk) - Custom Self Designed Host + NUBM07E Diode + G2 Lens
-447nm: ~3500mW (~3700mW pk) - Cypreus IIIb Host + 9mm 450nm Diode + G2 Lens
-447nm: ~1400mW (~1500mW pk) - Dragonlasers Host + M140 Diode + 3 Elements Lens
-405nm: ~500mW (~700mW pk) - Sanwu Challenger + G2 Lens

Laser Power Meter:
-Hyperion Aurum
-Hyperion Argentum
-Hyperion Cuprum
-LaserBee II OEM

Reference Sensor:
-Ophir L30A-19mm-BNC
-Ophir 150C-A-.2-FLASH
-Ophir 150C-A-.1-AX
-Ophir 20C-A-1-Y
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Old 03-03-2017, 05:07 PM #31
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

That is a very good reading accuracy. You've impressed.
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Old 03-03-2017, 06:46 PM #32
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Default Re: No access to any LPM owner; what's the most accurate and easiest to make DIY LPM?

Quote:
Originally Posted by astralist View Post
And i might want to add something:
if one side of TEC/peltier fixed/glued (using thermal glue of course) then the other side can be used as a temperature sensor, thus it can be used as laser power meter.
Actually the TEC/peltier in the seebeck configuration
is not used as a temperature sensor for LPMs.
It is used as a differential voltage sensor between the
front and rear plate's differential temperatures.

Jerry
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