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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > 445nm Lasers



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Old 12-30-2011, 07:05 PM #1
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Default possible to test initial power with LaserBee LPM

I just bought a Laserbee 2.5W LPM,
Here is a graph of my Work-in-progress laser


I did manage to hit the "magical" 2W
But I am wondering what power my laser is outputing initialy.

If I were to point 2 of my lasers at the LPM, turn on my weaker ~1.2W, and let the lpm "warm up" until it shows 1.2W, then quickly turn my powerful laser on and weaker laser off

Would that allow me to get closer to an initial reading? or would That throw off the results somehow?


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Old 12-30-2011, 07:24 PM #2
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Default Re: possible to test initial power with LaserBee LPM

It sounds like you are mistaking the initial reading for initial laser output.

The meter works on the temperature difference between the sensor and the cooling plate it is mounted on, it will take some time for the laser to heat the mass of the sensor and show true power.

Your 445nm laser does not have any "initial" output, diodes are just on/off.
It is different for 532nm where the crystal setup have to reach operating temperature.
(Or overheat, or not quite reach it, depending on laser.)
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Old 12-30-2011, 08:08 PM #3
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Default Re: possible to test initial power with LaserBee LPM

As a LD heats up the power output drops.

It takes my LPM 30 seconds to register the actual power my laser is outputing, during that 30 seconds my ld is warming up and outputing less power.

I am wondering what my diode is outputing before it heats up at all.
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Old 12-31-2011, 10:48 PM #4
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Default Re: possible to test initial power with LaserBee LPM

Quote:
Originally Posted by justinjja View Post

If I were to point 2 of my lasers at the LPM, turn on my weaker ~1.2W, and let the lpm "warm up" until it shows 1.2W, then quickly turn my powerful laser on and weaker laser off

Would that allow me to get closer to an initial reading? or would That throw off the results somehow?
Me and a few other people were talking about the same thing recently and we came to the conclusion that you can "prime" the LPM with another laser and then turn on the laser you actually want to test that way you get a better idea of your initial power output.
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Dragon Lasers- 532nm viper 35mW output=67mW
Dragon Lasers- 532nm Hulk 100mW output=213mW
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Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
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