> 350mw putting out over 700mw - 532nm CNI PGL-III-C

[fubada]

Wow - after getting a defective 350mw 532nm PGL-III-C and sending it back to CNI under the warranty I cannot be more happy with the replacement putting out >700mw.

http://www.youtube.com/watch?v=C4Kmqpp7uF4

 

[udanis]

Wow you luck dog!!! 700mw of 532nm is impressive.

 

[RA_pierce]

Nice laser.
It looks like it is much like my own. How long will it hang above 700mW?

 

[LarryDFW]

fubada and I have been discussing the #18650 battery requirements for 700 mw of green.

The IR diode requires a LOT of current for operation at this power level.

Low internal resistance is mandatory to deliver anything close to this power level.

Dr. Lava and I were measuring some batteries in this thread:

Battery internal resistance

Only the latest top of the line #18650 batteries,
can deliver this power continuously.

LarryDFW

 

[fubada]

RA - Hangs above 700 for 10 seconds then drops to > 650 and stays there until I decide to shut it off usually around 60sec duty cycle. I'm afraid to push this any longer than ~60secs. Thanks.

fubada and I have been discussing the #18650 battery requirements for 700 mw of green.

The IR diode requires a LOT of current for operation at this power level.

Low internal resistance is mandatory to deliver anything close to this power level.

Dr. Lava and I were measuring some batteries in this thread:

Battery internal resistance

Only the latest top of the line #18650 batteries,
can deliver this power continuously.

LarryDFW

 

[Nordhavn]

How hot does the body get when doing these 60 cycle runs?

Nice crystal set you got there. Any idea on pump current? If it's under 3A you got a nice one!

 

[fubada]

Just measured IR current draw - 3.1A with Sanyo, 3.0A with Sony cells. Both are 2600mah 18650's purchased from Larry@LPF.

Is this a reasonable current draw?

@60seconds ON the host body/head are completely cool. No noticeable heat at all.

Thanks.

 

[Trevor]

How's the mode structure look? Anything I've ever gotten that far over spec usually was running with a higher-order mode thrown in, upon closer inspection.

-Trevor

 

[fubada]

Solid tiny dot. TEM00. Mode shifts alot during the first 10 seconds then stable.

I'll take pics and measure divergence.

 

[aryntha]

My PGL-III-C 400 does 650-690mW, and will do that for a full 60 seconds, TEMoo. However, it starts out at 20mW (!) and takes a full 5 minutes to get there.

Worries me a bit, the long warm up time actually.

But this is the same 'class' of overspec, give/take 50mW....

 

[madog]

If you ever have to go out of town and need a laser sitter, I'm your man!

EDIT; Is this type of performance common for CNI?

 

[aryntha]

EDIT; Is this type of performance common for CNI?

Yes, it is. (Well, let's say there are more stories of CNI lasers being this overspec than any others. And CNI has a tendency to be overspec in general.)

Recently it seems Jetlasers isnt' that far behind; my "250" (I call it a 300, because it never goes below that) puts out 440.

 

[madog]

Thankyou aryntha

 

[fubada]

Just measured the divergence for this laser at 1.2mrad.

here is the dot pic (using no flash, macro, zoom, grey background)

 

[aryntha]

Fubada, can I ask what happened to your original PGL-III-C?

 

[fubada]

It was sent back to CNI due to low power and high TEM mode.