LPM video of Jetlasers 600mW PL-D greenie

[romogracie]

Gray from Jetlasers took the time to create this LPM video of the PL-D I just ordered. Pretty cool customer service if you ask me...

I heard DHL shipping is crazy fast and hopefully it arrives by the end of the week.

 

[rhd]

Gray from Jetlasers took the time to create this LPM video of the PL-D I just ordered. Pretty cool customer service if you ask me...

I heard DHL shipping is crazy fast and hopefully it arrives by the end of the week.

I'm sorry... am I missing something? Is he seriously LPMing that laser by placing it upside down ON the sensor itself?

 

[lasersbee]

Gray from Jetlasers took the time to create this LPM video of the PL-D I just ordered. Pretty cool customer service if you ask me...

I heard DHL shipping is crazy fast and hopefully it arrives by the end of the week.

Not to burst your "New Toy" bubble....
but that Laser LPM test is worthless... IMO

1) he placed the Laser right on the Sensor...
2) the heat from the Laser will increase the actual reading.
3) any IR at that distance will effect the reading

Ask the seller to do the test again with the Laser at least
12" or more from the sensor to get a more accurate reading.


Jerry

 

[rhd]

I'm BLOWN AWAY by the fact that a company like JetLasers would use an LPM so misleadingly.

Jerry, is there any possibility that the sensor Gray is using is ok to use in that configuration?

If not, that's pretty damn embarrassing for a company like JetLasers.

 

[romogracie]

Hmmm, I did think it was a bit weird that the laser was placed directly on the sensor.

I'm gonna ask Gray to redo the LPM test with the sensor further away.

 

[Elektrotechniker]

I lol'd at the lpm test
Seems like the laser was underspec and they tried to make it the lpm read more ^^ :crackup:

 

[romogracie]

Dangit, Gray just told me the laser has already been shipped out.

Hopefully it's not underspec when I test it again with my Kenometer Pro.

 

[Elektrotechniker]

Dangit, Gray just told me the laser has already been shipped out.

Hopefully it's not underspec when I test it again with my Kenometer Pro.

Hey, I hope it's up to spec. Didn't mean to make you believe it will be underspec, but what Jerry said is true.

 

[jimdt7]

Its the first time i see someone lpming a laser like that !
Hope your laser is overpsec ! Also about dhl shipping. It usually takes 3-4 days for me !

 

[lasersbee]

I'm BLOWN AWAY by the fact that a company like JetLasers would use an LPM so misleadingly.

Jerry, is there any possibility that the sensor Gray is using is ok to use in that configuration?

If not, that's pretty damn embarrassing for a company like JetLasers.

It is more than likely a Thermal Sensor with a low thermal mass
head... The rear of the Head is touching the Table and the front is
in contact with the Powered Laser...

It will pick up ANY heat source... whether it is a Laser Beam or
radiated heat.


Jerry

 

[romogracie]

I just completed a little experiment with my RPL and Kenometer:

I varied the sensor distance from a few millimeters to a foot away from the laser... and the readings weren't affected at all.

The PL-D supposedly has an IR filter like the RPL does, so I'm optimistic the power readings in the video above weren't inflated in any way.

 

[lasersbee]

I just completed a little experiment with my RPL and Kenometer:

I varied the sensor distance from a few millimeters to a foot away from the laser... and the readings weren't affected at all.

The PL-D supposedly has an IR filter like the RPL does, so I'm optimistic the power readings in the video above weren't inflated in any way.

You will need to do the test with a 700mW 532nm Laser touching
the head and table as done in the video for 2 minutes an 16 seconds.

Then do the test again at a distance with the head on a tripod for
the same amount of time to get a more accurate representation
of the 2 tests...


Jerry

 

[romogracie]

Here's a 2 minute LPM test of my new PL-D 600...

There seems to be ~30mW IR leakage.

 

[blakegriffin]

Here's a 2 minute LPM test of my new PL-D 600...

There seems to be ~30mW IR leakage.

I would consider that to be a nice kinda steady output good laser.

 

[rhd]

Well it seems like either this isn't the laser that was sent to me or it has become underspec with only slight use.

Here's a 2 minute LPM test with a freshly charged battery of my new PL-D 600...

Image: http://i55.tinypic.com/11sz1h4.jpg

I've tried a few different batteries and I always get that huge drop in power before 1 minute is up.

I hope Gray can do a quick RMA for this!

From your chart, it looks like the laser gets reasonably stable after 1:12

In that video, the laser is already running at the beginning. It's quite possible that the laser had been running for 1 minute and 12 seconds before the video started, and thus was displaying the stability that you're seeing towards that latter end of your LPM.

As far as the ~100mW overall discrepancy, I would think it highly possible that a laser LPM'd in that fashion would create enough heat to skew the results up 100mW or so, especially given the fact that it will have been running for a while.

 

[romogracie]

It seems like my PL-D is a bit underspec. :cryyy:

I'm getting huge drops in power and the overall average for 3 minutes is 579mW.

Hopefully Gray will replace my PL-D with a more stable one with a higher average.