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Optotronics RPL-375 review

Milos

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I just got my RPL-325 replaced, and upgraded to this higher power model. Thanks Jack for the major hookup, and on time!!

After initial tests, this laser exceeded all my expectations. And I'm picky.. ask Jack if you don't believe me.
Here are some quick specs I measured today.

Divergence: not more than 1.1mRad. (still testing this with different power levels and filters)

Power:
Tested with Coherent LaserCheck

With freshly charged battery:

1-15sec samples = 405-420mW
15-30sec samples = 430-470mW
30-90sec samples = 440-499mW (wouldn't touch 500mW :))

Then it dropped to 370-388mW as I continued measuring for another 2 minutes.
Body didn't get warm after that test.

After about 30 minutes of short ON and OFF times that tired the battery a bit, I measured it two more times with about 5 min OFF in between. Both tests were about the same.

1-15sec sample = 370-405mW
15-30sec samples = 380-390mW
30-90sec samples = 368-380mW .. where it stayed till I stopped measuring at 180sec.

After that third test body started to feel slightly warm.

Test (level5) - later date (fresh battery)
I just did another quick test with different fresh battery. A bit different results but still more than positive surprise.

0-1min 380-420mW
1-2min 360-390mW
2-3min 408-440mW
4-5min 370-415mW
5-6min 338-390mW


On level #1 it outputs 150-160mW. (with good battery)
100-120mW with used battery.

Test #2 (level 1) - later date (used battery)
0-1min 105- 115mW
1-3min 110-118mW
3-5min 110-122mW
5-8min 115-125mW
8-10min 115-125mW
10-12min 120-130mW
12-15min 130-150mW
15-18min 125-130mW
19-21min 118-121mW
22-25min 108-113mW

What amazes me the most is that there is no visible beam instability at any moment in the first 3 min. You know the usual initial "flicker" Not even during first few seconds warmup. Very nice.
Also, I noticed something not that important, but very admirable to me.
Beam output is almost perfectly in-line with centerline of the laser body. I LOVE that. Its better than any unit I ever had or seen. Must be one in a hundred that is this well placed.

Projected dot is nice and round. No scatter. I check that at distance shooting right next to edge of the wall.
My previous unit had irregular dot that kept changing shapes on a small scale. Everything else was great though and it took me a while to make up my mind to send it back.
The bad things about RPL in my opinions are the size of the switch in the back. It's hard to see what number it is set on unless you angle it perfectly under light. Also, it would look a lot nicer if the huge red on/off button was different and didn't stick out so much.

I want to thank Jack for such amazing unit (and for all those free optics again !!!). I was skeptical about even higher power units having good beam quality, but I can tell you guys I’ve never had or seen such great performing hand held laser.

And now few pics.
(All beam shots are done without any smoke and main ceiling light ON.)

Tv(Shutter Speed) 0.4Sec. ; Av F5.6 ; ISO Speed 400
 

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Milos

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Here you can see how it appears against tv and lighted room. No smoke but id did rain today so its more humid than usually?

Tv(Shutter Speed) 1/6Sec.. ; Av F4 ; ISO Speed 500
 

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styropyro

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Those pics are amazing! How long of exposure was used on those pics? Does the beam really look like that in real life in that lighting?
 

Milos

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It looks very close to that in real life!
Of coarse, the more you look inline with the beam, the more visible it becomes. Also, if the beam is comming towards you it looks even brighter and sparkier. Background colors make big difference too. I will insert comments next to each picture for those interested in photo settings. You can also save pics to your computer and check more detailed info on any canon program.

here is another couple.
 

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Milos

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this one with popular forum as background. , .. and the kitchen of course.

by the way, I just found out I've been banned from LC.

.. It took them a while.
 

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chelydra

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Which the distance from i can see the ray?
How many meters i can do with an rpl laser as your (300 mw).
Thanks for replies
F.
 

Merlous

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First off nice reviewl Milos and some very nice pics. Well the LC's loss is our gain :cool:

Cheyldra welcome to the forum, unfortunately there is no exact answers for your questions, its like how long is a piece of string? it varies on alot of factors, E.g. How dark it is, how many particles there are in the air like dust or smoke, what angle you looking at the beam at, how sensitive your eyes are, I could go on. If you could be a bit more specific.
 

bootleg2go

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chelydra said:
Which the distance from i can see the ray?
How many meters i can do with an rpl laser as your (300 mw).
Thanks for replies
F.
Hi Chelydra,
There is not a straight forward answer for this as there are many variables.
The 1st is the amount of particulate matter in the air and it's transparency.

You have to realize that the beam you see going through the air is actually the laser light being reflected off of dust and any other stuff floating in the air.
For instance if you were out in space where there are very very few particles floating around, you could have a 1 million watt laser and when it's turned on you would'nt see a thing except maybe a small sparkle every once in awhile whet it actaully had a particle to reflect off of. On the other hand, on a dark night with fog a 5mW laser is going to look light a huge light saber and the beam will be visible from a good distance.

Conversely, with very little particulate matter to block and reflect the light, the light will travel a very long distance but does become dimmer at greater distances due to divergence.

Jack
 

Milos

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Thanks Merl. It is good to be here.

As for beam visibility, I think question has been pretty much answered. Many aspect are determining how well you see it and from which point in. I would suggest also getting a lower powered green pointer to test and understand it better.

Btw, welcome to the forum chelydra

Yesterday I used different battery and left laser ON over 11min until it finally dropped under 300mW. I turned it off myself and It barely got warm at all. Strangely battery protection circuit in the laser did not turn the laser off earlier. Must be good battery (I gotta mark it)
By the way, that is waaay better than suggested duty cycle !!!!

I just did another quick test with different fresh battery. A bit different results but still more than positive surprise.

0-1min 380-420mW
1-2min 360-390mW
2-3min 408-440mW
4-5min 370-415mW
5-6min 338-390mW

as you can see, the peak 60 seconds performance was during 3rd minute when it was well into 400mW range. And quite comfortably, might I add.

At exactly 6min mark battery protection circuit turned the laser off. I waited like 5 seconds and turned it on again and continued measuring over 310-340mW for the next 60sec. Battery obviously got tired.

I wish I had a better power meter so I could post better power performance measurements, but I’m happy I got this at least.
 

Milos

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ixfd64 said:
Nice! I thought that Optotronics' most powerful laser was the RPL-350.

not for long .. ::)
Jack has not been hiding that he has higher powered models lined up for near future release. They are still undergoing quality performance tests before official release.

P.S.
Check out.
I added 2 more power tests on the top post taken on level 5 (6 min), and on level 1 (25 min)
Both tests were ended with auto shut off by battery protection circuit.
 




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